Vineyard Management and Its Impacts on Soil Biodiversity, Functions, and Ecosystem Services

Introduction: The Importance of Soil in Viticulture

Vineyards are planted all over the world, mostly between 30 and 50 degrees latitude, in both the Northern and Southern hemispheres. In 2020, the total area under vines was about 7.3 million hectares (wine grapes, table grapes or dried grapes) and total wine production was 260 million hectoliters. The global market (total exports of all countries) reached 105.8 million hectoliters and 29.6 billion Euro in terms of value (Organisation Internationale de la Vigne et du Vin [Oiv]., 2021). Despite this significant economy, there is a growing awareness and concern among winegrowers and consumers that some agricultural practices, and in particular the use of pesticides and intensive tillage, can have detrimental impacts on biodiversity (Paiola et al., 2020), soil quality and soil associated biodiversity and on sustainable wine production (Viers et al., 2013). Hence, winegrowers must consider and promote soil quality in their vineyards, defined as “the capacity of a soil to function within ecosystem boundaries, sustain biological productivity, maintain environmental quality and promote plant and animal health” (Doran and Zeiss, 2000; Riches et al., 2013).

However, knowledge about the threats to the soil in vineyards and their consequences on wine quality is scarce. Thus, efforts are required to better understand and protect soil to maintain respective ecosystem services. Interactions between soil biological communities as well as chemical and physical properties of the soil environment are fundamental to many soil processes, functions and services, such as carbon storage and cycling, nutrient cycling, soil structure formation, and pest regulation (Pulleman et al., 2012). Soils also play a key role in climate regulation and, thus, in mitigation and adaptation to climate-change, particularly in regulating greenhouse gases (Pulleman et al., 2012). This contrasts with the considerable body of knowledge on the relationships between soil characteristics and wine quality, driven by the prestige and profitability of high-quality wine production. Future research must focus on a better understanding of threats associated with viticultural management practices, as well as options for protecting soil biodiversity, functions and services while maintaining high-quality wine production and the aesthetic value of vineyard landscapes. The current work summarizes existing knowledge concerning the effects of vineyard practices on soil biodiversity, and how related ecosystem functions and services may enhance vine growth and yield. Subsequently, it offers some prospects for mitigating threats to the soil ecosystem and improving conditions for biodiversity, drawn from current research projects on these topics.

Relationship Between Terroir Characteristics, Soil Management, and Wine Production

The economic importance of wine production within a particular territory is one of the most effective motivations for protecting wine typicity (Costantini et al., 2012; Vaudour et al., 2015). Consumer perception that wine quality is closely linked to its geographical provenance creates the basis for preserving rural environments, not only in terms of productivity, but also in terms of landscape aesthetics and lifestyle. Consequently, winegrowers in geographically defined production areas place particular importance on preserving the quality of the land, thus adding further value to the wine. Wine marketing often uses the beauty of the vineyard landscape as an effective medium for promoting sales and increasing the market value of the product, developed through oenotourism (Tempesta et al., 2010). The use of the expressions “terroir,” “typical,” “identity,” and “sense of place,” mostly used in the wine sector, strictly connect the value of geographic origin and the landscape to the intrinsic value of a wine (van Leeuwen et al., 2004). In contrast, viticulture is often practiced as an extensive monoculture within a region, reducing the cover and quality of natural or semi-natural habitats. This has a negative impact on landscape aesthetics and associated biodiversity (Costantini and Barbetti, 2008). Management of the entire agroecosystem should be integrated, including ecological and cultural practices, to improve sustainability and habitat protection, as well as biodiversity and the associated ecosystem services (Viers et al., 2013; Chrysargyris et al., 2018). Most of these conservation actions concern the soil, which is not only one of the most threatened habitats in vineyards (Costantini et al., 2015, 2018), but also provides fundamental services to wine production.

Terroir may be defined as the interaction of all ecosystem characteristics in a given place that affect the crop phenotype, including vines (grape varieties and rootstocks), climate, and soil (van Leeuwen and Seguin, 2006). Grapevines are planted in a huge variety of different soils throughout the world, but soil is one of the most important factors in wine quality (van Leeuwen and Seguin, 2006). The wine economy of an area, including the focus on marketing high- or low-priced wine, is associated with soil characteristics, as well as environmental factors such as climate, geomorphology, and landscape quality (Costantini et al., 2016). However, only rarely the impact of soil management on biodiversity is taken into account.

Based on the most recent classification proposed by the Common International Classification of Ecosystem Services (CICES - La Notte et al., 2017), many soil processes contribute to functions associated with Ecosystem Services (ESs). For example, grape production and the decomposition of organic matter are related to provisioning and regulating ESs. According to Lal (2001), any soil degradation impairs soil quality or deteriorates the functions that contribute to ESs provision. It is, therefore, essential to consider the effects of soil management practices in vineyards on ecosystem functions (Herrick, 2000), particularly in the context of climate change (Chrysargyris et al., 2018).

In the Mediterranean or comparable water-limited climates, rainfall is generally concentrated in the winter season and does not usually exceed 400–500 mm per year. In this context, where water is a very limited resource, traditional management is based on intensive weed control to avoid competition with grapevines for water and nutrients. Herbicide use increased considerably with the global intensification of pesticide use in the 1950–1960s. However, nowadays, tillage and herbicide use are the two most-widespread systems under water-limited conditions (e.g., Biarnès et al., 2004). These practices are associated with a decline in soil quality, e.g., soil erosion, soil compaction, and loss of organic matter (Steenwerth and Belina, 2008; Salome et al., 2014, 2016; Biddoccu et al., 2016). Herbicide use also negatively influences biodiversity through the reduction of resources (Kazakou et al., 2016; Hall et al., 2020) or direct effects on the metabolism of organisms and groundwater quality (Louchart et al., 2001).

In temperate regions, especially under maritime influence, the climate is characterized by higher rainfalls, more evenly spread throughout the year, and soils are more fertile with higher nutrient availability (Peregrina et al., 2012). Hence, tillage or herbicides to reduce competition between vines and weeds is unnecessary and may even be undesirable, due to the risk of intensified erosion and nutrient leakage from bare soil in heavy rainfall (Biddoccu et al., 2016). In addition, it may be difficult to drive machinery for other pesticide applications. Permanent plant cover between rows has been widely adopted, at least during winter and spring, since vineyards are more often prone to precipitation-related soil erosion than weed competition. A further possibility is to adopt a permanent grass cover in alternate inter-rows, while the intervening inter-rows are tilled one or more times a year, depending on precipitation conditions and any potential negative competitive effects of weed species on grape yields or quality (Peregrina et al., 2012).

Another intermediate management technique, called “green manure,” combines tillage or herbicide and permanent cover, with sown cover crops in winter or spring. These cover crops help to improve nutrient supply to the vines (especially nitrogen fixation by legumes species), store carbon, and mitigate soil erosion during winter. This practice includes the cultivation of sown cover crops destroyed by tillage before it starts competing with the vines for nutrients and water. Nevertheless, the soil type and, in particular, its lime content and texture, strongly influence the effectiveness of cover crops in providing these benefits (Ruiz-Colmenero et al., 2011; Salome et al., 2016). Consequently, strategies combining various management practices are more effective for maintaining and improving soil quality (Ruiz-Colmenero et al., 2011). Therefore, flexible, innovative practices are required to face the key issues of vineyard complexity and counteract the negative effects of climate change on soil fertility (Salome et al., 2014, 2016).

Wine-growing areas are more exposed to several environmental risks, as other agricultural landscapes: soil erosion, depletion of biodiversity, as well as water and air pollution due to the use of pesticides (Viers et al., 2013). In addition, vineyard topography (especially steep slopes), the abundance and distribution of precipitation (modified by climate change), and anthropogenic factors increase soil exposure to various threats, particularly erosion and landslides (Arnaez et al., 2007; Martínez-Casasnovas and Ramos, 2009; Biddoccu et al., 2016; Chrysargyris et al., 2018). As highlighted by the analysis of long-term soil-loss measurements under natural rainfall (Cerdan et al., 2010), vineyards exhibited the highest soil losses in Europe, compared to other crops and land uses. Vineyard planting also strongly impacts soil and involves slope reshaping, deep plowing, which mixes topsoil and subsoil, as well as stone crushing and removal. These operations entail a high risk of decreasing soil functionality and biodiversity, as well as degrading the beauty of the landscape and long term sustainability of the vineyard (Le Bissonnais et al., 2002; Costantini and Barbetti, 2008; Martínez-Casasnovas and Ramos, 2009; Costantini et al., 2015). During high-intensity rainfall events, the accelerated erosion damages fields, reduces organic carbon stocks and soil fertility, exposes roots, and causes rill erosion, as well as downstream damage, with flooding, mudslides, and pollution (Le Bissonnais et al., 2002; Arnaez et al., 2007). As this accelerated erosion modifies the carbon dynamics, it may also have a broader environmental impact, such as reducing carbon sequestration and biodiversity (Lal, 2001). Furthermore, climate change may lead to the extension of viticulture at higher altitudes and latitudes, potentially impacting upland ecosystems and eliminating natural or semi-natural vegetation (Hannah et al., 2013).

Soil Biodiversity in Vineyards: Trophic Interactions and Ecological Services

Soils are living environments and include a large variety of microhabitats, characterized by different physicochemical properties (Coleman et al., 2004). A countless diversity of organisms lives in these habitats, generally divided into 4 categories according to their body size (Lavelle and Spain, 2001): microorganisms (Fungi, Bacteria, Protists, and Archaea), microfauna (e.g., Collembola, Acari, Amoeba, Nematoda, Annelida Enchytraeids) and macrofauna (e.g., earthworms, gastropods and larger arthropods).

All these organisms have a textural (changes in the distribution of mineral and organic particles) or structural (formation of aggregates and soil horizons) influence on soil functions. Soil texture and structure influence above-ground vegetation and animal communities through changes in fertility, related to biogeochemical cycles and plant nutrition (Coleman et al., 2004; Blouin et al., 2013). Soils provide nutrients and water to support the growth of both crop and spontaneous plant species: the latter are often considered weeds (Figure 1). The provisioning service of soil fertility associated with the regulation service of nutrient cycling is directly or indirectly associated with below-ground organisms, from macro- or mesofauna, the primary decomposers of organic matter, to microorganisms (Figure 1). Agricultural practices, such as tillage, pesticide and heavy machinery use, interfere with vegetation diversity and cover and are of primary importance for the soil trophic networks that drive the diversity and abundance of all taxa.

FIGURE 1

Figure 1. Ecosystem services provided by vineyard soils. Biodiversity is strongly linked to habitats availability in this agroecosystem: soil and plant cover above-ground. In turn, biodiversity strongly drives several regulating services (blue boxes), related to supporting services (green boxes), and influences some provisioning services (red boxes).

Most of the studies exploring the relationship between soil biodiversity and its functions in agricultural landscapes have focused on arable crops, but less on vineyards. The following paragraphs examine aboveground biodiversity that is strongly linked to soil conditions, firstly represented by vascular plant communities in vineyards and the services they provide. Organisms will be then considered in order of size, from the larger taxa of animals, macrofauna and mesofauna living in soil or on the ground surface, to microorganisms. We describe the state of the art concerning these taxa, as well as the services provided in vineyards, particularly nutrient cycling and pest regulation, as well as the influence of agricultural practices and soil parameters on the diversity and abundance of these taxa.

Very little research exists on larger soil organisms such as small mammals (moles and small rodents), and focuses mostly on their negative effects on vine yield, and their biological control by predatory birds such as owls in Napa valley using next boxes in vineyards (e.g., Wendt and Johnson, 2017).

Vascular Plants

Herbicides and tillage are still the most common techniques for soil management in viticulture as they are supposed to eliminate the competition between weeds and vines, thus improving grape yields and quality in water-limited conditions (Peregrina et al., 2012). However, no significant competitive effects of inter-row vegetation cover have been observed in oceanic climates or irrigated vineyards, especially where soil water-holding capacity was high (Wheeler et al., 2005; Monteiro and Lopes, 2007; Baumgartner et al., 2008; Steenwerth et al., 2013; Irvin et al., 2016). Nowadays, many winegrowers are aware of the benefits of plant cover for the vines and the vineyard agroecosystem. The vineyard should be considered as a consociation, formed by the vines and the underlying grasses, both complementing the functions and ecosystem services of the vineyard. Associated plant diversity in vineyards may contribute to multiple ESs, such as mitigating soil erosion and, preserving soil fertility, biocontrol of vine pests by promoting colonization of vine rows by their natural predators (see in the following paragraphs and Nicholls et al., 2000), aesthetic value of viticultural landscape (Hervé et al., 2020), and conservation of endemic species (Gillespie and Wratten, 2012). Studying the benefits and ecosystem services supported by spontaneous flora in vineyard agroecosystems is a quite novel topic (Garcia et al., 2018), but findings suggest that vegetation cover should be used wherever soil and climate conditions are favorable.

Vineyards are mostly associated with a moderate level of plant diversity; nevertheless, like other permanent, heterogeneous systems with a multi-strata design such as orchards (Simon et al., 2010), they have a high potential for preserving agroecosystem biodiversity and providing habitats for xerothermic species. In recent years several studies have evaluated plant diversity in vineyard ecosystems. Examining varying numbers of sampling plots and environmental conditions, 32 plant species were found in one vineyard in Napa Valley (Baumgartner et al., 2008), 86 species in 25 vineyards (averaging 22.2 ± 2.9 per site) in northern Switzerland (Bruggisser et al., 2010), 177 species in 33 vineyards (ranging from 24 to 46 average number of plant species per vineyard) in the Piemonte region of north-western Italy (Mania et al., 2015), 211 species in 18 vineyards (averaging 32.8 in organic and 25.1 in conventional vineyards) in the Veneto region in north-eastern Italy (Nascimbene et al., 2012), over than 200 species in 120 vineyards of Dão winegrowing region of Central Portugal (Monteiro et al., 2012), and 259 species in 48 vineyards in southern Switzerland (Trivellone et al., 2014).

Soil conditions and cultural practices selected several physiological, morphological, and dispersal traits among plant communities (Kazakou et al., 2016), e.g., the proportion of perennial species increased with less-intense management (Gago et al., 2007; Kazakou et al., 2016). Plant diversity and community composition depend on inter-row plant management, i.e., mowing or mulching frequency, fertilization and tillage intensity, chemical weed control, and sowing of a mixed cover crop or fostering spontaneous vegetation (Gago et al., 2007; Bruggisser et al., 2010; Nascimbene et al., 2013; Trivellone et al., 2014), as well as the management and characteristics of adjacent areas (Thomson and Hoffmann, 2009; Simon et al., 2010; Mania et al., 2015). Weed-control techniques influence species richness and composition of plant communities. For example, shredding inter-row vegetation had a more negative effect on plant diversity than mowing but this effect was lower than local abiotic conditions, such as vineyard altitude and slope that drive the community composition (Bruggisser et al., 2010). In a landscape with small vineyard plots, the diversity of microhabitats also enhances the conservation of rare species. For example, 9% of sampled species in Swiss vineyards were regarded as near threatened or vulnerable, according to the national red list (Bruggisser et al., 2010). Extensive management practices in vineyards, like organic farming, have been found to increase plant diversity in Italy (e.g., Nascimbene et al., 2012), probably due to the ban on herbicide use. The negative effect of herbicides was also confirmed by Sanguankeo and León (2011) in California. However, Bruggisser et al. (2010) and Kehinde and Samways (2014) did not find any significant effect of organic farming on plant diversity in a set of South African and Swiss vineyards, where no herbicides were used, even in the conventional plots. Inter-row vegetation management also influences dominant plant traits, such as basal buds or underground regeneration in case of frequent mowing (Gago et al., 2007) or a higher specific leaf area in tilled vineyards (Kazakou et al., 2016). Several studies identified a significant reduction in vascular plant diversity in vineyards with intensive soil tillage (Sanguankeo and León, 2011; Bagella et al., 2014; Kazakou et al., 2016). This technique benefits certain species that regenerate from plant fragments, like Spergula arvensis (segetal species), and annual plant species with short development cycle (Gago et al., 2007). Changing from mulching to mowing led to an increase in the proportion of plant species with basal rosettes (Bruggisser et al., 2010). Traditional species-rich communities, featuring bulbous geophytes, have become very rare due to changes in soil management in Central European vineyards (Bruggisser et al., 2010). Mowing frequency also modifies dominant plant traits and particularly enhances the cover of rosulate and reptant species (Nascimbene et al., 2012). Nevertheless, since the seed germination of ruderal species benefits from bare soil created by tillage, a low frequency of soil disturbance seems to benefit plant diversity (Gago et al., 2007), in accordance with the intermediate disturbance hypothesis (Grime, 2006).

First tested in annual crops, there is a growing interest in cover crops or sown vegetation in vineyards, at least in inter-rows (Garcia et al., 2018). As already mentioned, one common technique is to establish permanent vegetation in alternate inter-rows, while the intervening inter-rows are tilled several times a year, depending on precipitation or the sowing of cover crops. Annual cover crops may be divided into two main classes: winter cover crops, sown in autumn, adapted to winter conditions and removed by tillage in the following spring or dry season, and summer cover crops, sown in spring. Cereals and legumes are the two main categories of plants used as cover crops. Spontaneous as well as sown species may provide several services to winegrowers: their management and the choice of species are very important for simultaneously maintaining production and regulating services in the vineyard.

Although using resident natural vegetation or sowing cover crops is viewed partly critically due to potential competition effects on vines, this management is beneficial from an environmental point of view (Marques et al., 2010) and it is supported by agro-environmental schemes. This becomes especially obvious if a permanent vegetation cover is permanently maintained over the entire surface throughout the year to reduce soil erosion, one of the major ecosystem disservices in many sloping vineyards (Gyssels et al., 2005; Blavet et al., 2009; Marques et al., 2010). Plant species adapted to local conditions may also provide numerous other ESs for the agroecosystem, including buffering soil nitrogen availability (Martínez-Casasnovas and Ramos, 2009; Messiga et al., 2015; Pérez-Álvarez et al., 2015), increasing soil organic matter content (Steenwerth and Belina, 2008; Blavet et al., 2009; Mazzoncini et al., 2011; Salome et al., 2016), regulating water use (Monteiro and Lopes, 2007), soil temperature and vineyard microclimate (Fourie and Freitag, 2010), as well as in fertile soils, controlling vine vigor and enhancing grape quality (Wheeler et al., 2005; Monteiro and Lopes, 2007; Giese et al., 2014). Furthermore, fostering spontaneous vegetation or use of cover crops not only increases plant diversity (Hall et al., 2020) but also inhibits troublesome weeds (Monteiro et al., 2012; Kazakou et al., 2016; Steenwerth et al., 2016). For example, the use of cover crops reduced the cover and frequency of spontaneous, ruderal plant species, like Digitaria sanguinalis and Chenopodium album (Gago et al., 2007; Smith et al., 2015). Spontaneous vegetation enhances the biodiversity of the whole ecosystem at different trophic levels, as it provides the main energy source for decomposers and heterotrophic organisms (Danne et al., 2010; Kehinde and Samways, 2014; James et al., 2015; Buchholz et al., 2017; Geldenhuys et al., 2021).

Macrofauna: Earthworms

Among all the taxa, earthworms are a well-studied group of macroinvertebrates, representing the largest component in the animal biomass in soils (0.1–12 g dry weight per square meter) and are very important organisms for maintaining soil fertility (Jeffery et al., 2010). They are commonly known as “ecosystem engineers,” thanks to their burrowing, mixing and casting activities (Jones et al., 1994; Blouin et al., 2013). Earthworms can be divided into three ecological categories, based on their distribution within the soil: epigeics, anecics and endogeics (Bouché, 1977 in Blouin et al., 2013). Epigeic species, also known as litter or surface-dwelling species, live on the soil surface, in leaf litter and humus layers, and sometimes in the first few soil centimeters. Anecic species, also known as topsoil species or soil-dwelling species, live in permanent, vertical burrows, connected to the soil surface, which are important for soil drainage. Endogeic species, also known as subsoil or soil-dwelling species, live mainly within the soil and are important for maintaining its granular structure. All these groups and species are known to strongly influence plant growth by creating and connecting pores (burrows, aestivation or hibernation nests), that modify the physical matrix for roots, aggregating or disaggregating particles, and moving them within the soil profile (Wurst et al., 2018). These activities are conditioned by soil organic matter content and quality, soil compaction, species interactions, and seasons (Pérès et al., 1998; Capowiez et al., 2009; Blouin et al., 2013).

Ecological functions provided by earthworms are mainly pedogenesis, soil structure development, water regulation, nutrient cycling, primary production, climate regulation, and pollution remediation (Blouin et al., 2013). Soil management practices in vineyards have direct and indirect impacts on the ecology and physiology of earthworms (Schreck et al., 2012). While the impacts of tillage on earthworms have been studied intensively in arable systems, little is known about vineyards. However, the consequences of soil tillage are quite similar, as it severely reduces earthworm abundance, biomass, and variety (Paoletti et al., 1998). Conversely, Buchholz et al. (2017) showed a higher species diversity in infrequently tilled plots, which could be related to a higher plant diversity and soil fertility in these plots. Earthworm biomass was negatively, but only slightly, impacted by reduced tillage methods, such as grubbing, rotary hoeing and harrowing, particularly in spring under dry soil conditions. Furthermore, when soil is tilled only every second inter-row, rapid re-colonization may occur between disturbed rows and rows with permanent herbaceous cover (Faber et al., 2017).

Earthworms are useful bioindicators, as they respond quickly to environmental inputs, such as chemicals, and can therefore be used to monitor the effects of farming practices and soil contamination (Paoletti et al., 1998; Pérès et al., 2011). Earthworms are impacted by copper, used as fungicide, which decreases earthworm survival, growth, and behavior (measured as a decreasing burrowing rate, Eijsackers et al., 2005; Pelosi et al., 2014; Karimi et al., 2021). Herbicides may also affect the activity and reproduction of earthworms, especially anecic species (Gaupp-Berghausen et al., 2015). A laboratory experiment showed that fungicide and insecticide spraying was neurotoxic for endogeic earthworms (Schreck et al., 2008). In contrast, organic fertilization increased the abundance, biomass, and diversity of the earthworm community (Pérès et al., 1998).

Macrofauna: Gastropods

Unlike earthworms, gastropods are part of a less studied group of macroinvertebrates, including isopods and myriapods, comprising mainly litter- and topsoil-dwelling species, as well as a few endogeic ones. ESs provided by gastropods are mainly linked to the decomposition of organic matter and soil structure improvement (Wolters and Ekschmitt, 1997). By feeding on organic matter and promoting microflora through burrowing organic material, as well as producing enzymes and feces, gastropods contribute 1% to the total decomposition activity of soil biota (Schaefer, 1990).

In natural systems, gastropod richness and diversity decreased with lower soil pH values, due to lower calcium availability (Nekola, 2010). Soil moisture, texture, and vegetation composition are also strong drivers of their abundance and diversity (Dvořáková and Horsák, 2012; Hettenbergerová et al., 2013). In vineyards, as in agricultural fields in general, most gastropods are xerothermophilic (dry- and warm-adapted, mostly open-land species), but communities tend to be less species-rich than in grasslands. Cultivation involves several types of disturbance: (i) mechanical disturbance that increases exposure to predators and destroys microhabitats used for reproduction and shelter, (ii) simplification of vegetation that leads to loss of shelter, moisture, and food, (iii) use of mineral fertilizers that acidify the soil, such as nitrates, and (iv) biocides that reduce plant cover and/or are toxic to gastropods (Wolters and Ekschmitt, 1997).

The decrease in abundance and richness within gastropod communities may foster pest organisms: the simplification of plant cover favors pest species with corresponding feeding preferences and the loss of predators and competitors (Wolters and Ekschmitt, 1997). Most of the introduced gastropod species are considered vineyard pests, such as (i) the Cepaea nemoralis snails in Ontario, Canada, which use vines as a daytime roost and are picked with the grapes, thereby fouling the wine (Martinson, 1999), (ii) Meghimatium pictum slugs in Brazil, that feed on fruit pulp (Baronio et al., 2014), (iii) Bradybaena similaris snails in Taiwan, that destroy leaves and buds (Chang, 2002), and (iv) Cornu aspersum and Theba pisana snails in South Africa, which feed on developing foliage and leaving a mucus trail on grapes, deteriorating the aesthetics of table grapes, or contaminating dried-fruit products with their shells in Australia (Sanderson and Sirgel, 2002). The last two species may reach densities of up to 400 individuals per vine and cause economic losses of up to 25% (Sanderson and Sirgel, 2002).

Soil management practices that minimize the disturbance of gastropod communities, such as low tillage and the use of organic fertilizers, help to maintain and restore the gastropod community and reduce or eliminate pest problems (Wolters and Ekschmitt, 1997). The maintenance of a complex landscape in wine-growing regions may also favor the persistence of gastropod communities able to recolonize vineyards if soil management intensity decreases. For example, in Austria, two rare gastropod species, Zebrina detrita and Caucasotachea vindobonensis, had refugia in managed grassy stripes bordering vineyards (Duda, 2016). However, changing from intensive soil management to an extensive system may also attract pest species (e.g., in Australia - Sanderson and Sirgel, 2002). Vegetation or mulch cover provides shade and moisture advantageous for gastropod development and thus increasing pest slug densities (Baronio et al., 2014).

Macrofauna: Predatory Arthropods

Among the arthropod communities that provide ESs in agroecosystems, generalist predators may act as biological control agents of crop pests (Symondson et al., 2002). Several groups of generalist predators are found in vineyards. Spiders (Araneae), rove beetles (Staphylinidae), ground beetles (Carabidae) and ants (Formicidae) are among the most abundant taxa living on the ground or near the soil surface in vineyards (Thomson and Hoffmann, 2009). Soil dwelling spiders are excellent hunters and mostly belong to the Lycosidae and Gnaphosidae families. They prey on various vineyard pests, e.g., caterpillars (grapevine moths) or Hemipteran species living on vine leaves. Ground beetles such as carabids or rove beetles may also be abundant in vine plots. They are well-studied arthropod predators in agroecosystems and consume various insect pests and weed seeds (Holland, 2002). Moreover, they are well-adapted to open habitats and intensive agricultural landscapes, dominated by perennial cropping systems, such as vineyards (Rusch et al., 2016a). Ants may also exert top-down control of arthropods in natural and agricultural systems (e.g., Chong et al., 2010), but mealybug-tending ants could also hamper parasitoid biocontrol of certain pests such as vine mealybug (Cocco et al., 2021).

Several factors related to soil, vegetation diversity and management are known to affect generalist predators and regulation associated services (Rusch et al., 2010; Winter et al., 2018; Pfingstmann et al., 2019).

Firstly, habitats with higher plant diversity or a more complex structure feature more abundant predators, smaller herbivore populations, and less plant damage, compared with plant monocultures (Langellotto and Denno, 2004; Letourneau et al., 2011; Rusch et al., 2017). Vegetation diversity around vineyards and in-field grass cover is thus expected to favor the diversity of arthropod communities with a high level of resources (Nicholls et al., 2001; Hogg and Daane, 2010), and sustains biological pest control and seed predation (Rusch et al., 2017; Winter et al., 2018). Perennial agroecosystems provide important resources and functions for all these generalist natural enemies, such as overwintering sites, alternative hosts, and food sources. Rusch et al. (2017) demonstrated that inter-row plant cover is a strong driver of grape moth density in vineyards: it was significantly lower in vineyards with full compared to partial grass cover. Higher richness and activity-density of rove beetles, carabids, and hoverflies were found when natural vegetation was preserved, at least between the rows (Sanguankeo and León, 2011; Pétremand et al., 2017). However, several studies detected little or no effect of vegetation cover on carabid communities: the presence of surrounding vegetation may influence trapping success (Hanna et al., 2003; Sanguankeo and León, 2011). Community changes may also occur, with higher abundances of macropterous species with higher dispersal capacities than dimorphic or brachypterous species, which may be associated with an increase in tillage (Rusch et al., 2016b). The relationship between arthropod diversity and ES delivery is, however, variable, suggesting that rare species may contribute little to the agroecosystem functions. Thus dominant species are probably the main drivers of ES delivery such as pest control (Winfree et al., 2015; Winter et al., 2018).

Secondly, disturbance on the field scale, especially soil tillage, is known to be a key driver of the abundance and diversity of predatory arthropods (Holland, 2004). Several characteristics of soil tillage may affect aboveground arthropods, including intensity, frequency, the type of tool used, and the timing of the operation (Rusch et al., 2010; Pfingstmann et al., 2019). Larval stages of several predatory Coleopteran families are also strongly dependent on above-ground resources and disturbance intensity (Holland, 2002). Tillage may affect arthropods through indirect effects on habitat quality, by modifying their biochemical and biophysical characteristics or changing prey distribution and resource availability such as microarthropod prey (Pfingstmann et al., 2019). In addition, soil tillage may have direct lethal effects through mechanical damage, burying organisms or forcing them to migrate (Holland, 2004; Rusch et al., 2010).

Thirdly, it is reported that organic farming enhances the abundance and diversity of several taxa, from plants to birds, as compared to conventional arable farming (Tuck et al., 2014). However, somewhat contrasting results have been reported in viticulture: some studies reported a neutral effect (Bruggisser et al., 2010; Uzman et al., 2020) and others a positive effect of organic farming on certain predatory arthropods (Caprio et al., 2015; Ostandie et al., 2021). These may be due to the taxa considered, as well as differences in terms of farming practices labeled “organic” or “conventional”, which are highly variable (Ostandie et al., 2021). Brachypterous carabids, ambush spiders, ground-hunter spiders and other hunters preferred organic vineyards, whereas macropterous carabids, specialist spiders (mostly ant-eating spiders), and sheet web weavers selected conventional vineyards (Caprio et al., 2015). Landscape context is also known to be an important predictor of arthropod assemblages and the level of biological control in agroecosystems (Bianchi et al., 2006; Chaplin-Kramer et al., 2011; Rusch et al., 2016b). For example, it is well documented that semi-natural habitats are key habitats for many arthropods, as they foster individual fluxes, provide overwintering sites, refuges from disturbance, and alternative food and hosts (Thomson and Hoffmann, 2009; Hogg and Daane, 2010; Paiola et al., 2020).

Mesofauna: Collembolans and Mites

Soil mesofauna mediates soil functioning through a wide range of engineering processes such as distribution of organic matter, bioturbation, comminution, incorporation of litter into soil, determining structural porosity, and the formation of soil aggregates through burrowing, casting, and nesting activities, as well as feeding on microbial communities (Lavelle et al., 2006; Brussaard et al., 2007). These functions contribute to improving water infiltration, as well as mitigating soil erosion and nutrient provision. Collembola and some taxa in the mite (Acari) subclass, such as Oribatida are the most extensively studied microarthropods involved in detritivore food webs. The suborder Oribatida (order Sarcoptiformes) among the mites comprises over 10,000 species worldwide and is the most important group in providing decomposition ES in forests and grasslands (Culliney, 2013). They are also very abundant in vineyards (Gagnarli et al., 2015). They are involved in decomposition as direct consumers of organic matter, as well as indirectly, via a catalytic effect, by consuming saprophytic fungi and bacteria. This has a major impact on the composition of microorganism communities and makes a significant contribution to the fragmentation of plant residuals (Brennan et al., 2006). Generally, these organisms are quite sensitive to the quantity of resources in their habitat, i.e., the organic matter content of upper soil layers (Gagnarli et al., 2015).

Mesofauna abundance and biomass in soil differ among land use and habitat types. Few studies have identified microarthropods in soil samples at the species level and used standardized data on individuals per surface. However, a recent study in France compiling over 750 samples collected under different land-use conditions, including forests, grasslands, arable lands, vineyards, urban vegetable gardens, and urban soils, concluded that vineyard soils were by far the most negatively impacted by human activities (Joimel et al., 2017). Even if total microarthropod densities were higher in vineyards than in other agroecosystems, these soils presented the lowest Collembola species richness and evenness, the lowest Collembola ecomorphological index, and the highest Acari/Collembola ratio (Joimel et al., 2017). However, the samples were collected from Mediterranean vineyards (Languedoc and Banyuls appellations), where the dry climate may lead to generally low mesofauna density and diversity (Joimel et al., 2017). Renaud et al. (2004) found very wide variations in Collembola abundance, from a few hundred to over 12,000 individuals per square meter, depending on the soil treatment and season, with considerably smaller populations where herbicides were used. In undisturbed ecosystems, Oribatida densities easily reach several thousand individuals per m² comprising between 20 and 50 different species. In agricultural fields, their density is about ten times lower, mainly because of the cultivation practices that have negative effects on these mites (Behan-Pelletier, 1999). In vineyards, maintaining herbaceous vegetation in inter-rows fosters Oribatida adult densities (Nannelli and Simoni, 2002). Other vineyards in Europe need to be sampled to extend our knowledge of these groups, particularly their diversity and abundance. The abundance of some species seem to be enhanced by organic management as observed by Seniczak et al. (2018). Furthermore, vineyard management includes many different levels of impact (i.e., fertilization, mowing frequency) that affect this mesofauna (Fiera et al., 2020). Surprisingly, springtail communities were more diverse in tilled inter-rows, and springtails were more abundant in the inter-rows with herbicide use in vineyard rows of Romanian vineyards (Fiera et al., 2020), which is probably due to disrupted competitor/predator relationships. In Bordeaux vineyards, Ostandie et al. (2021) also found that tillage combined with organic farming and the reduction of insecticide use fostered springtail abundances, however, not their diversity. Due to their sensitivity to changes in the environmental conditions, mesofauna is increasingly used as a quality bioindicator of quality in agroecosystems. The Soil Biological Quality index QBS-ar assumes that soils of higher quality will shelter more abundant, varied mesofauna (Parisi et al., 2005). The advantage of this method is that specimens are not classified on a species level, but grouped into specific taxa (Classes, Superorders and Orders). Furthermore biological forms are determined according to their morphological adaptation to soil environments and scored to calculate the QBS-ar index (Parisi et al., 2005). The few studies conducted in vineyards found QBS-ar values ranging from 137 to 230, indicating potential higher quality than in arable soils (e.g., Rüdisser et al., 2015). Values were lower in Portugal vineyards and higher in ground cover treatments (Gonçalves et al., 2020). For example, some biological forms symptomatic of undisturbed soil, such as Diplura, Protura, Pauropoda, and Chilopoda, were found in many vineyards. Organic management even recently adopted (3-year period after conversion) fostered microarthropod community diversity as observed by Ghiglieno et al. (2020) in Lombardy vineyards. Several other parameters influence microarthropod communities such as vegetation cover, soil characteristics, degree of compaction, and organic matter content related to weed and soil management. In agricultural fields, the long-term exposure to synthetic or organic pesticides and their accumulation in soils also contributes to the reduction of the abundance and the diversity of mesofauna, particularly euedaphic forms (Karimi et al., 2020, 2021; Ostandie et al., 2021). A comprehensive risk assessment of the degree of soil contamination (by heavy metals and pesticides; excess of nitrates and phosphates) and declining soil biodiversity is usually indirectly assessed.

Mesofauna: Nematodes

Nematodes are probably the most abundant multicellular animals on earth, occupying a broad range of trophic levels. Several taxa of nematodes occupy important trophic positions in the soil detritus food web; many graze on bacteria and fungi, thus regulating decomposition and nitrogen mineralization. Other free-living or plant-parasitic nematodes are useful bioindicators of soil health. Nematode assemblages act as disturbance indicators for assessing the effects of pollution on soil and studying food web dynamics (Ferris and Tuomisto, 2015). The following tools are used to measure the ecological status of soil communities: the Maturity Index (MI), an ecological measure of environmental disturbance based on nematode species composition (Bongers, 1990), and the Ferris indices, based on trophic levels and food web systems (Ferris et al., 2001). ESs provided by soil nematodes include nutrient cycling (supporting service) and controlling pest species (regulating service). Predatory and omnivorous nematodes are involved in these services through a process of predation. Recently, Ferris and Tuomisto (2015) developed a new index named “diversity-weighted abundance” index, to evaluate the efficiency of these ESs.

Overall, agricultural intensification affects nematode fauna causing important multitrophic effects (Yeates et al., 1999; Govaerts et al., 2007). Nematodes are not necessarily adversely affected by cultivation practices and are, for example, less sensitive to tillage than larger soil animals (Wardle, 1995). As reported by Coll et al. (2012), compaction reduces nematode abundance and disturbs omnivores and predators in vineyards.

Few studies have investigated the whole nematode community associated with vineyards. Overall, free-living nematodes: bacterial feeders, omnivores, and predators, are more dominant in shallow soil (0–10 cm), whereas plant-parasitic nematodes are mainly located deeply and in the immediate vicinity of the root surface (Malossini et al., 2011; Rahman et al., 2014). Most studies have focused on plant-parasitic nematodes that cause serious damage in vineyards. Most severe losses are caused by Xiphinema spp., Meloidogyne spp., Pratylenchus spp., Helicotylenchus spp. and Criconemoides spp. For example, Grapevine fanleaf virus (GFLV), transmitted by Xiphinema index, is responsible for a gradual degeneration of grapevines that occurs in most vineyards worldwide, causing yield losses of up to 80% (Andret-Link et al., 2004). Xiphinema indexis the sole natural vector of GFLV and the transmission process is characterized by a specific association between X. index and GFLV. Their actual management is preventive: infested grapevines including their roots should be removed at an early stage and destroyed to avoid contamination of replants (Villate et al., 2008; d’Errico et al., 2014). Generally, under uncultivated soil and set-aside management, the nematode colonizer species, mainly bacterivores, increased in abundance and richness while plant-parasitic nematodes and predators remained constant (Landi et al., 2018). Soil resting strategies following vine uprooting is therefore applied currently especially in infested vineyards to reduce abundances of plant-parasitic nematodes. Traditionally, the most effective control of plant-parasitic nematodes has been based on the use of chemical fumigants and nematicides, today banned for toxicological and environmental reasons (d’Errico et al., 2014).

Several studies have reported that increased soil organic matter content has a direct effect on nematode community, reducing plant-parasitic and increasing saprophytic species. Amendments, such as poultry-litter biochar, green manures, and compost, decreased the abundance of plant-parasitic nematodes (Rahman et al., 2014). In a long term study, Coll et al. (2012) estimated that organic practices promoted fungal-feeding nematodes, which are key species in organic matter turnover and nutrient cycling in soils. Cover crops or vegetation strips with plants attracting parasitic nematodes is also a considered solution, although not well-explored (Villate et al., 2008).

Microorganisms and Microfauna

Soil is described as being the most diverse environment but the least known habitat, in terms of microbial diversity and its role in ecosystem functioning (Nielsen et al., 2015; Orgiazzi et al., 2016). Recent advances in genomics have made sampling and monitoring more standardized and affordable¹. The major challenge is still to assign species to ecosystem functions. Nevertheless, it is well known that soil microorganisms are key drivers of most of the main soil processes (Nannipieri et al., 2003; Wagg et al., 2014) and play diverse and often crucial roles in soil-related ESs. Microbial communities drive soil nutrient dynamics and any changes in their activities and functions may compromise soil biogeochemical cycles and nutrient availability to plants. Soils harbor an enormous microbial diversity, mainly represented by bacteria and fungi that represent the largest proportion of the total microbial soil biomass. Thus, maintaining a taxonomically and functionally diverse microbial community is a key factor in supporting sustainable agricultural management (García-Orenes et al., 2016).

Microbes have been collected throughout the soil profile, although they are more abundant in upper soil layers and the rhizosphere (Bundt et al., 2001; Fierer et al., 2007). Rhizodeposition affects both the structural and functional diversity of microbial communities (Mendes et al., 2011; Dias et al., 2013; Philippot et al., 2013). Notably, soil bacteria can live in plant tissues as endophytes and modulate plant growth and development, with direct implications on plant physiological status and its response to biotic and abiotic stress (Bulgarelli et al., 2013) or on the beneficial properties of medicinal plants (Chiellini et al., 2014). Plant-soil-microbe interactions are complex, with plant species (even specific genotypes or varieties), soil type, and agricultural practices exerting the most influence on the composition of the microbial communities (Wu et al., 2008; Dias et al., 2013; Burns et al., 2015; Vega-Avila et al., 2015). Repeated tillage is known for its long-lasting impacts on soil microbial communities (Buckley and Schmidt, 2001; López-Piñeiro et al., 2013) and Pinguel et al. (2018) observed a strong composition difference in both bacterial and fungal communities between tilled rows and those with permanent grass cover. Vega-Avila et al. (2015) also observed an increase in bacterial diversity in the rhizosphere of organically managed vineyards. Conversely, reduced tillage, nutrient application, and the reduction of pesticide inputs exert a positive effect on soil biology, resulting in a significantly higher level of biological activity (Mäder et al., 2002; Girvan and Bullimore, 2003; Morlat and Jacquet, 2003; López-Piñeiro et al., 2013; Martins et al., 2013). Moreover, long-term application of organic fertilizers compared to mineral fertilization induced a further increase (Treseder, 2008; Geisseler and Scow, 2014) or a slight decrease in microbial biomass with an increase in bacterial diversity (Francioli et al., 2016). Bokulich et al. (2014) proposed the term “microbial terroir” to emphasize the importance of regionally-specific microbial communities in fermentation processes that contribute to the specific characteristics of wine (see also Gilbert et al., 2014; Burns et al., 2015; Vaudour et al., 2015; Franco et al., 2021). Microbes colonizing roots may migrate through the plant to colonize aerial tissues (Bulgarelli et al., 2013), influencing plant traits and grape quality. Further studies are needed to elucidate the ecological role of specific soil- and plant-associated microbial taxa identified in vineyards. For example, soil protists are receiving increasing attention for their important and hitherto underestimated roles in soil food-web dynamics and nutrient cycling processes (Geisen et al., 2016). However, relatively few studies have investigated soil protists and none of them was conducted in vineyards.

Fungi and Mycorrhiza

Fungi drive ecological dynamics in soils as decomposers of organic biomass and nutrient recyclers. Macromolecules, including lignin and cellulose, are mostly depolymerized by fungi using peroxidases and laccases and are, therefore, essential for humification processes (Zavarzina et al., 2011). The filamentous nature of fungi and their production of polysaccharides contribute to aggregate formation and soil stability, especially in degraded soils (Rashid et al., 2016), and mineralization of nitrogen from organic biomass and rhizosphere depositions, thus recycling nitrogen for plant uptake. As a part of the food web, fungal hyphae provide a direct food source for numerous mesofaunal components, such as Collembola and mites (Jonas et al., 2007).

Numerous soil fungi are known for their opportunistic lifestyle, including strong saprotrophic compatibility and plant-related traits as endophytes or root associates. Certain Trichoderma species or strains activate plant defenses and induce root resistance to necrotic plant pathogenic fungi or restrict their proliferation through mycoparasitism. However, waterlogged situations or soil compaction in vineyards may trigger Blackfoot disease in grapevines, caused by other opportunistic species of the Nectriaceae with equally wide ecological amplitudes, including strong saprotrophic compatibility and plant-pathogenic abilities (Halleen et al., 2004). Permanent grass cover increased organic matter content in vineyard soils and, consequently, increased fungal counts (Whitelaw-Weckert et al., 2007). Furthermore, not only synthetic fungicides in conventional vineyards but also copper-based fungicides used in all vineyards including organic are used to control vine foliar pathogens and these can impact fungal soil communities and associated ESs (Probst et al., 2008; Karimi et al., 2020, 2021).

Among the most important soil fungi affecting the vineyard ecosystem are symbiotic arbuscular mycorrhizal fungi (AMF) (Trouvelot et al., 2015). AMF increase grapevine growth and nutrition by providing better access to soil nutrients and activating the regulation of plant transport proteins, particularly phosphate solubilization through acid phosphatases and the uptake of carbohydrates and lipids produced by plants and their dissemination into the soil (Trouvelot et al., 2015; Rich et al., 2017). The nutrient providing service of AMF is not the only one of primary interest in production systems where external inputs of fertilizers are limited (Gosling et al., 2006). It has also been demonstrated that AMF increase tolerance to abiotic stresses, such as water stress, soil salinity, iron chlorosis, and heavy metal toxicity, as well as protecting grapevines from root diseases (Trouvelot et al., 2015). Herbaceous plants used as cover crops may favor AMF in vineyards (Radic et al., 2012) whereas herbicides have been shown to decrease root mycorrhization (Zaller et al., 2018) but also soil AMF spore biomass, vesicles, and propagules in a model system (Zaller et al., 2014). AMF also induce resistance to root nematodes in grapevines (Li et al., 2006), as well as above-ground pathogens (Jung et al., 2012), as they alter biochemical pathways in above-ground grapevine tissue (Krishna et al., 2005). Surprisingly, AMF also alter the content and composition of secondary metabolites in grapevines, including phenols (Krishna et al., 2005).

Ecological Functions Associated With Soil Enzymes

Soil enzymes catalyze biochemical reactions and rate-limiting steps in organic matter decomposition and nutrient cycling in soil, thus controlling whether organic substances are decomposed or stored (Fansler et al., 2005) and influencing plant nutrient availability (Allison and Vitousek, 2005). Microorganisms mainly produce them, but plant debris, root exudates, and soil fauna also contribute to a lesser extent. Enzyme action may be intracellular or extracellular (both in the presence or absence of their originating cells), as well as free or immobilized (Gianfreda and Rao, 2004). Complex macromolecules (e.g., cellulose, lignin, pectin and hemicellulose) are not directly incorporated into cells, and need to be degraded by extracellular enzymes to yield small enough substrates (ca. 600 Da) for absorption into cell (Arnosti, 2011).

Extracellular enzymes, immobilized through association with clay minerals, humic acids, and particulate organic matter, retain significant levels of activity for prolonged periods (Burns, 1978; Dick, 1984; Fansler et al., 2005). The proportion of extracellular enzymes in soil largely varies depending on the type of enzyme and soil (reviewed by Burns et al., 2013). Anyhow, they represent a significant reservoir of potential activity and may even function as the first catalytic response to changes in substrate availability in soils, and they are also generating signal molecules for the microbial community (Caldwell, 2005; Fansler et al., 2005; Burns et al., 2013). Soil-bound enzymes may also be a source of substrate turnover during periods when microbial biomass is low or shut down due to stressed conditions (Stursova and Sinsabaugh, 2008). Their concentration in soils as well and microbial diversity and abundance is highly variable, as proposed by the use of “microbial hotspots and moments” by Kuzyakov and Blagodatskaya (2015). The concentration of substrates induces soil microbial synthesis of extracellular enzymes and one approach to assessing the physiological capabilities of microbial communities is to assay substrate degradation. In this context, measuring the activity of several soil enzymes may be useful for understanding organic matter turnover and inorganic nutrient availability (Dick, 1984).

Soil enzyme activities are a proximal driver of soil functioning, contributing to biogeochemical cycling, organic matter transformation, and nutrient availability. They are also widely recognized as indicators of soil health and candidate “sensors” of changes in soil management or fertility (Badiane et al., 2001; Vepsäläinen et al., 2001). In particular, they have been increasingly used to investigate changes in functions due to anthropogenic impacts (Dick, 1984; Vepsäläinen et al., 2001; Naseby and Lynch, 2002; Lagomarsino et al., 2008). The effectiveness of alternative vineyard strategies on higher enzyme hydrolytic activities has been demonstrated in several experiments applying green manure (Okur et al., 2009), no-tillage (Lagomarsino et al., 2008), grass-covering (Schreck et al., 2012), compost made from the organic fraction of municipal solid waste (Calleja-Cervantes et al., 2015), and biochar-compost mix (Mackie et al., 2015). The most extensively studied group of enzymes with ecological importance in soil are hydrolases, which are involved in the main biogeochemical cycling of elements and release of carbon, nitrogen, phosphorus and sulfur compounds (Caldwell, 2005). Other classes of enzymes exhibit oxidative activities such as laccases described by Theuerl and Buscot (2010); they can enhance the degradation of the most recalcitrant components of organic matter and are closely linked to soil carbon sequestration (Caldwell, 2005). Phenol oxidases and peroxidases, in particular, are key in cellulose and lignin degradation and further condensation of phenols, peptides and carbohydrates leading the formation of secondary humic compounds (Sinsabaugh, 2010). A final group of soil enzymes, poorly assessed, despite their importance for nutrient release, are lyases, which play a fundamental role in the detoxification of phenolics and reactive metals, antimicrobial defense, and the degradation of lignin, polysaccharides, and humic acids (Theuerl and Buscot, 2010).

Agricultural Practices in Vineyards and Threats to Biodiversity and Services

The soil ecosystem is one of the most complex habitats, due to the huge diversity of species, and the huge number of individuals present on a very small surface (Jeffery et al., 2010). A majority of studies mentions the following agricultural practices as threats to soil biodiversity: plowing or tillage, mineral fertilization, pesticide use, irrigation and drainage systems, and weed management (Brussaard et al., 2007; Holland et al., 2013; Tsiafouli et al., 2014; Paungfoo-Lonhienne et al., 2015). Perennial crops—particularly those planted as monocultures in large areas—are frequently associated with an increase in the use of machinery and pesticides, and with a decrease in vegetation cover. All these practices result in soil compaction, and a decrease in soil organic matter, that often is associated with structure disruption and erosion (Lal, 2001; Power, 2010; Tsiafouli et al., 2014).

In agroecosystems, intensive agricultural practices may cause soil degradation or deteriorate soil quality, leading to a decrease in the magnitude of one or more ESs (Lavelle et al., 2006). Agricultural practices increase the level of disturbance (e.g., tillage, mowing) and pollution (fertilizer and pesticide inputs), thereby not only changing physical soil properties but also affecting its biological communities and reducing the complexity of soil food webs and associated ESs (Bommarco et al., 2013; Tsiafouli et al., 2014). These reductions in biodiversity further modify soil functioning and, thus, the services it provides, as well as its resilience and ability to face the consequences of climate change, such as extreme weather events (Wall et al., 2015).

Soil erosion may represent losses of up to several millimeters of soil each year (Quiquerez et al., 2008; Rodrigo Comino et al., 2016). These values are much higher than those observed in natural systems and severely reduce the habitat suitability for a large number of taxa. A 4-year, field-scale experiment comparing four soil management systems revealed that permanent, inter-row grass cover reduced runoff and soil loss, compared to herbicide application resulting in bare soil, whereas results for superficial tillage and temporary grass cover with delayed herbicide treatment were intermediate (Le Bissonnais and Andrieux, 2007).

Chemical fertilizer and pesticide application are responsible for a global decrease in soil biodiversity, functions and services (Wall et al., 2015). The direct effects of mineral fertilizers on soil organisms have generally been described as limited, but their application may enhance soil biological activity through an increase in system productivity, crop residue return, and soil organic matter (Bünemann et al., 2006; Paungfoo-Lonhienne et al., 2015). However, nitrogen fertilization may lead to soil acidification, with considerable negative effects on soil organisms. In addition, a high input of mineral fertilizers negatively impacts plant diversity and community composition (Nascimbene et al., 2013; Paungfoo-Lonhienne et al., 2015). Organic amendments such as manure and compost provide a direct source of carbon for soil organisms and an indirect carbon source via increased plant growth and plant residue returns (Bünemann et al., 2006). For example, in Turkish vineyards, the application of green manure resulted in greater enzyme activity, and microbial biomass and activity (Okur et al., 2009). Compost applications or mulching were shown to have positive effects on soil structure comparable to permanent grass cover (Nachtergaele et al., 1998; Pinamonti, 1998). However, the costs involved in transport and the need for frequent applications may be high. The vineyard management techniques that are most efficient at preventing soil loss are also most favorable for preserving soil organic matter content and associated soil properties, such as aggregate stability (Le Bissonnais and Andrieux, 2007)and biodiversity (Duarte et al., 2014).

Water management in vineyards mainly consists of irrigation, but drainage may also be necessary in vineyards located in floodplains (Abbona et al., 2007). Water management aims to provide grapevines with a more amenable environment and prevent water stress. However, particularly in medium-dry environments, the implementation of water-saving irrigation techniques (e.g., partial rootzone drying) may lead to changes or decreases in the diversity and abundance of soil organisms that prefer a higher moisture content such as earthworms and generalist predators, spiders and ground beetles (Thomson, 2006; Holland et al., 2013).

Pest management techniques aim to reduce the competition between crops and weeds or reduce plant pest and pathogen densities. However, plant diversity and vegetation cover are important drivers of belowground processes: different plant species in crop rotation were shown to influence faunal, microbial, and soil organic matter dynamics via the diversity of root architecture, the quantity and quality of rhizodeposits, and residue biochemistry (Ingels et al., 2005). McDaniel et al. (2014) reported that introducing diversity with inter-row cover crops significantly increased microbial biomass. In addition, vegetation in vineyards also provides food and structure for many arthropod taxa (Altieri et al., 2005), and indirectly reduce pest abundance and support natural enemies (Lewis et al., 1997; Danne et al., 2010). Comparing the effects of pre- and post-emergence herbicide application, surface soil tillage, and no vegetation removal treatments, Collembola were most abundant in plots with vegetation cover, slightly less in post-emergence herbicide application and tillage plots, and least abundant in pre-emergence herbicide plots (Sturm et al., 2002; Renaud et al., 2004). However, herbicide application may increase mesofauna feeding activity in the short term, by providing dead plant material as food for detritivores (Reinecke et al., 2002). Due to the severe disturbance it causes, tillage may be more detrimental for mesofauna than herbicide application (Reinecke et al., 2002). Herbicide applications in vineyards can also affect soil biota with knock-on effects on other parts of the grapevine system, detectable even several months after its application (Mandl et al., 2018; Zaller et al., 2018).

Insecticide application generally reduces the abundance and, in the long term, the diversity not only of target pests but also of non-target species. For example, leafhopper abundance and diversity decreased strongly with insecticide use in Swiss vineyards (Trivellone et al., 2012). However, in a 2-year study comparing 5 vineyards in Arkansas (United States), carabids were more diverse and abundant in vineyards sprayed with insecticides than in abandoned, non-sprayed vineyards, while Hymenopteran parasitoids suffered from insecticide treatments (Williamson and Johnson, 2005). The authors hypothesized that, in the short term, insecticide spraying resulted in more food available for carabids on the vineyard floor.

Little research has been done into the effects of fungicides on biodiversity in vineyards. While some studies showed an effect of sulfur spraying on predacious mites, other studies did not find any negative effects (Walton et al., 2012). Fungicide application alters the grape surface microbial communities, and fungicides used in organic farming (sulfur, copper) have stronger effects than synthetic fungicides (Milanović et al., 2013). In particular, copper fungicides are considered to be among the most toxic, persistent fungicides (Bünemann et al., 2006) and impact several biodiversity groups (Korthals et al., 1996; Karimi et al., 2020, 2021; Ostandie et al., 2021). Copper residues are reported to be responsible for significant reductions in microbial biomass due to stressed microbes in orchards (Merrington et al., 2002) and cause long-term reductions of earthworm populations (Bünemann et al., 2006). Copper has also a major influence on nematodes and this effect was generally enhanced with decreasing soil pH. High copper contaminations significantly reduced the number of bacterial-feeding nematodes, whereas the number of hyphal-feeding nematodes increased (Korthals et al., 1996). Omnivorous and predacious nematodes showed the most sensitive response, until extinction. Plant-feeding nematodes also showed large variations in their abundances that could be related to the effects of copper and pH on primary production (Korthals et al., 1996). As copper accumulates in surface soils, these negative effects are likely to persist for many years.

One of the principles of organic farming states that it protects and benefits the common environment, including biodiversity. However, organic farming regulations do not oblige farmers to use inter-row vegetation cover and scientific evidence for the benefits of organic farming on biodiversity in vineyards is conflicting. In a large-scale study, including vineyards throughout Italy, predatory mite biodiversity was higher in organic and untreated vineyards than conventional ones (Peverieri et al., 2009). A slight increase of spider diversity has been observed in organic vineyards in Germany but no significant effect was reported on spider abundance (Kolb et al., 2020). However, other studies showed less biodiversity in organic vineyards: soil bacteria were less diverse on organic farms than conventional ones (Bonanomi et al., 2016). In a Swiss study, Bruggisser et al. (2010) also failed to detect an increase in plant and spider diversity in organic vineyards, while grasshopper diversity was even significantly lower in organic compared to conventional vineyards. Most of the benefits of organic farming for plants seem to be attributable to the absence of herbicide use (Sanguankeo and León, 2011; Nascimbene et al., 2012; Kehinde and Samways, 2014).

Suggestions for Managing Soil Biodiversity to Ensure Sustainable Viticulture

Trade-Offs Between Grape Production and Biodiversity

Viticulture has a long tradition and management practices have changed over the centuries. The economic importance of wine production, especially of high-quality wines, has also increased and winegrowers tended to focus on consistent production and consider that ecological aspects were of minor importance.

A range of farming practices that increase species diversity and associated functions and services have gradually been adopted by farmers in arable crops: conservation tillage, organic fertilization, natural vegetation cover or cover crops. These techniques can maintain higher levels of biodiversity by providing continuous plant cover and improving organic matter content (Bommarco et al., 2013). In addition, practices such as agroforestry, manure and residue inputs, and soil resting (a long period before replanting of vines) are gaining importance and may help to prevent soil degradation, reduce pesticide inputs and nutrient losses to adjacent habitats. They also indirectly promote the maintenance and conservation of biodiversity and multiple ESs such as pest control on a larger scale (Lewis et al., 1997; Bommarco et al., 2013). Such techniques, trade-offs between services they imply as well as the level of provided services are not well assessed and known for vineyards, nonetheless fundamental if we are to develop sustainable grapevine cropping systems.

Diversifying the management around viney ards or landscape diversification outside the actual production area influences biodiversity in vineyards. They can consist of buffer strips or riparian hedges. For example, remnants of natural habitats within vineyards promoted spider diversity in South African vineyards (Kehinde and Samways, 2014). However, islands or patches of beneficial plant species do not necessarily have to be in the vineyards (Altieri et al., 2005). Semi-natural areas in the surroundings of vineyards have a positive impact on habitat diversity but need to be connected by habitat corridors (Altieri et al., 2005). Alternating vegetation cover in inter-rows, when technically feasible, can maintain a high-biodiversity habitat within a single vineyard. This idea should be combined with current research on pesticide use adapted to local conditions, at the row or even vine-stock level (Llorens et al., 2010).

However, certain management practices require trade-offs between biodiversity and ESs (Bommarco et al., 2013). For example, the use of manure and agricultural compost increases organic matter content, but should be avoided close to water sources such as rivers and lakes, due to possible increased nitrate seepage, resulting in deteriorated water quality. At the same time, farmers may perceive the loss of certain ESs as negligible, while the reduction in yield or crop surface results in a decrease in provisioning ES (Verbruggen et al., 2012), directly linked to tangible economic losses. Such trade-offs, and especially, their consequences should be at the center of future research programs exploring links between biodiversity, ESs, and wine production.

Recently, the ecological aspects of wine production have received more attention, with higher numbers of organic and biodynamic winegrowers and greater awareness among consumers and politicians of the concept of sustainability and the negative effects of high-input viticulture. Sustaining ecosystem functions and services, as well as testing sustainable farming practices, are key issues in recent agroecological and biological conservation research and policy (Batáry et al., 2011). Winegrowers need to find a balance between ecological and economic aspects that may be symbiotic although contradictory in some parts of the production process.

However, environmental protection is often considered to impede the prosperity of enterprises, especially in the agricultural sector. Winegrowers tend to think of environmental-friendly actions as counterproductive for the quality of their wine and their earnings (Gemmrich and Arnold, 2007). Sustainability offers a solution for this conflict by integrating profitability with environmental and social issues. It offers a wholesome approach toward winegrowing and wine making (Gemmrich and Arnold, 2007). One of the major advances achieved by farmers in recent years is the perception that only a small percentage of the invertebrates present in their fields have a negative impact on crops (Lavelle et al., 2006).

There is also a gap between scientific literature and winegrowers’ definitions of the ES concept and its application to viticulture. Both farmers and scientists recognize biodiversity and genetic diversity conservation as important (Brussaard et al., 2010). Viers et al. (2013) linked the sensitivity of wine-makers to ESs with the importance that they seem to attach to the terroir concept and their understanding of soil characteristics. The challenge for winegrowers is to identify the aspects of biodiversity that are desirable to maintain and/or enhance in their vineyards, as they provide specific ecological services, and then determine the best practices for encouraging this biodiversity and the associated ESs (Altieri, 1995; Gliessman, 1998; Winkler et al., 2017).

Lack of Knowledge and Research Gaps in Vineyards

Some aspects of the interaction between biodiversity conservation, management practices, ecosystem functions, and grape quality/yield are obvious and clearly understood, while many others are uncertain or even unknown (see previous sections). For example, insect functional biodiversity is assessed on plot and field scales with a focus on natural enemies to tackle biological control of vine pests (e.g., Danne et al., 2010; Caprio et al., 2015), while others investigate functional micro-biodiversity in the soil, involved in plant health management (Whitelaw-Weckert et al., 2007; Trouvelot et al., 2015). Future research should focus on the impact of viticultural landscape diversification and natural vegetation or cover crop mixtures in vineyard inter-rows on overall biodiversity and associated ESs. The interrelations and trade-offs between the responses of different taxa on field and landscape scales and the consequences for provisioning ES are still largely unexplored. In addition, only a few studies have investigated multiple trophic levels and ESs in vineyards. Furthermore, studies implementing a standardized research protocol in different climate zones are important to assess possible trade-offs and synergies between ESs in vineyards. In addition, in order to promote biodiversity conservation measures, further research is required on the relationships between certain plant species and host-disease transmitting vectors, which may impede the positive effects on biodiversity (Costa et al., 2004).

Relevant topics include the ecological role of specific soil- and plant-associated microbial taxa in vineyards. Plant growth-promoting rhizobacteria increase growth, but may also induce system resistance, thereby enhancing plant defenses (Beneduzi et al., 2012). Some of these mechanisms have been described in model plants, but current knowledge of these aspects in vineyards is limited (Beneduzi et al., 2012). Recently, certain microorganisms have been promoted as soil quality enhancers and responsible for particular organoleptic qualities (Zarraonaindia et al., 2015). These aspects need to be investigated under different soil and climate conditions keeping an eye also on nutrient cycles and nutrient availability. This topic also nicely illustrates the complexity of research tasks and the different disciplines which need to get involved.

Future Management Options and Research Directions

Currently vineyard management range from no disturbance at all (permanent plant cover) to high disturbance (regular soil tillage or herbicide application). Permanent cover and cover crops provide numerous benefits in terms of ESs, which are beneficial for the vineyard environment and increase grape quality (Biddoccu et al., 2016; Chrysargyris et al., 2018; Garcia et al., 2018). Cover crops have been found to increase soluble solids, anthocyanins and other phenolic components of grapes (Guerra and Steenwerth, 2012), increase microbial biomass of soil (Ingels et al., 2005) while controlling grapevine canopy growth (Tesic et al., 2007). However, they may compete for nutrient supply and nitrogen as observed in several European vineyards by Griesser et al. (2022).

Cover crops could be also implemented for in-row weed control, even if knowledge about in-row cover crops is scarce (Garcia et al., 2018). Use of in-row vegetation cover would avoid herbicide applications or mechanical weed control (Garcia et al., 2018), thereby indirectly and positively affecting inter-rows through the reduction of soil compaction and the number of tractor passages. Winegrowers are concerned about cover crops that may compete with vines for nutrients and water, but specific mixtures may avoid these negative effects and could provide higher biodiversity within vineyards (Garcia et al., 2018; Griesser et al., 2022). Using native plants and selecting particular species and traits within the natural pool has been also proposed as a potential solution for managing the soil under the vine rows (Tompkins, 2010). Furthermore, the application of mulch under vines during winter has been demonstrated to disturb the cycle of the gray mould fungus, Botrytis cinerea, and reduce its pressure by up to 70% (Jacometti et al., 2007). Studies using different plant mixtures and evaluating their impact on vine physiology, as well as grape quality, are pending, but are likely to produce important findings for adapting in-row management toward increased sustainability, less disturbance, and, possibly, promoting biodiversity.

The combined need for consistent yields of high-quality grapes, a reduction in external inputs, and climatic challenges with prolonged periods of drought, heavy rainfall, and prolonged growing seasons, makes it difficult for winegrowers to make informed decisions (Chrysargyris et al., 2018). It is necessary to develop risk management tools and adapt them to local conditions, including aspects of soil preservation, plant physiology, and pesticide management. Existing models have proved their effectiveness for pest management, but do not provide a thorough evaluation of the effects of pesticide applications on soil organisms.

Furthermore, awareness of sustainable crop production has increased among consumers, as well as producers. Winegrowers need reliable, basic knowledge of the effects of their production systems on biodiversity and other ecosystem functions, and implementing new measures need to be knowledge based. This knowledge has to be provided by scientists in terms of cultivar selection (cultivars resistant to biotic and abiotic stresses), trellising systems, canopy and cover-crop management, soil cultivation, winemaking processes, storage, and the use of renewable energy. Due to the increasing influence of international wine organizations, threats linked to climate change and new market opportunities, the wine sector has become more aware of the concept of sustainability (Hannah et al., 2013; Viers et al., 2013; Litskas et al., 2020). The global environmental footprint of wine production could be quantified and other impacts of practices on the use of resources or human health have to be measured and compared to biodiversity and environmental impacts (Litskas et al., 2020). Growing numbers of sustainable winemaking projects on local, regional, and national scales identified a number of ESs provided by vineyard soils that led to the development of locally-adapted methods and educational programs (Viers et al., 2013; Santiago-Brown et al., 2014).

Author Contributions

BG, SW, SB, EAC, JZ, and IL conceived of the presented idea, based on European projects ReSolVe, PromESSinG and VineDivers. All authors contributed to the article and approved the submitted version.

Funding

The review formed part of the PromESSinG and VineDivers projects, funded by the 2013–2014 BiodivERsA/FACCE JPI joint call for research proposals with the national funders Bundesministerium für Bildung und Forschung (BMBF, Germany), Agence Nationale de la Recherche (ANR, France), Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI, Romania), Ministerio des economía y competitividad (MINECO, Spain), FWF-Der Wissenschaftsfonds (Austria) and the Swiss National Science Foundation (SNSF, Switzerland Grant No: 40FA40_158390). The contract of BG was supported in 2017 by the European Union Seventh Framework Program via a grant from the PromESSinG project. Contributions to this review were also supported by the research project ReSolVe funded by transnational funding bodies, being partners of the FP7 ERA-net project, CORE Organic Plus, and the cofound from the European Commission; and by the research project SECBIVIT which was funded through the 2017–2018 Belmont Forum and BiodivERsA joint call for research proposals, under the BiodivScen ERA-Net COFUND program, and with the funding organizations: AEI/Spain, BMBF/Germany, ANR/France, NWO/Netherlands, UEFISCDI/Romania, FWF/Austria (Grant No: I 4025-B32) and the NSF/United States (Grant No: 1850943). Researches on soil biodiversity conducted in the SAVE unit (BG and ARu) were supported by the Conseil Interprofessionel des Vins de Bordeaux CIVB during the Phytae project (2018–2020) and the Endless project (2021–2024).

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Footnotes

1. ^ http://www.earthmicrobiome.org/

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