About this Research Topic
The rhizosphere is one of the most dynamic interfaces in terrestrial ecosystems and is a hotspot of biogeochemical cycles in the soil. It has been recognized that many processes in the rhizosphere (e.g. root and hyphal exudation and turnover, soil organic matter decomposition, nutrient transformation, and greenhouse gas production) are pivotal in controlling ecosystem functions and the services they provide, such as carbon and nutrient cycling. Recent advances in microbiology, metabolomics, isotopic tracing, and numerical modeling have significantly improved our mechanistic understanding of rhizosphere processes. However, due to the opaque nature and complexity of the rhizosphere, our comprehension of rhizosphere processes at the ecosystem scale is still restricted, which greatly hinders our prediction of carbon and nutrient cycles of terrestrial ecosystems under global environmental change.
This Research Topic will examine the biogeochemical processes in the rhizosphere of terrestrial ecosystems in the context of global environmental change. We anticipate manuscripts targeting the rates and composition of root and hyphal exudation, the growth, mortality and turnover rates of roots and hyphae, rhizosphere priming effects on soil organic matter decomposition and nutrient transformation, the interactions among roots, mycorrhizal fungi and saprotrophic fungi or bacteria, the role of the microbial loop in carbon and nutrient cycling, and the modeling of these processes at the ecosystem scale. Tackling these problems will improve our mechanistic understanding of rhizosphere biogeochemical processes and help incorporating them into ecosystem-scale models.
We welcome manuscripts measuring rhizosphere processes at different scales, including the below:
1) mechanisms in the rhizosphere (small spatial scale)
2) processes and fluxes (field scale)
3) implications for ecosystem functions (ecosystem scale)
We give special emphasis to the effects of global climate change on the biogeochemical processes happening at different scales. Particularly, we welcome manuscripts related to global environmental changes (e.g., warming, drought, flooding, elevated CO2, nitrogen deposition, invasion, disturbance, land use change).
Sub-topics could include: root or hyphal exudation, turnover and decomposition, soil organic matter formation and decomposition, nitrogen and phosphorus transformations, rhizosphere priming effects, the Gadgil effect, and rhizosphere processes in the subsoil.
This list is not exhaustive and other areas of work are encouraged. Manuscripts may range from original empirical and modelling research articles, to perspectives, reviews, and meta-analyses.
Keywords: fine roots, soil organic matter, microbiome, decomposition, nutrient cycling
Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.