ORIGINAL RESEARCH article
Front. Soil Sci.
Sec. Soil Biology, Ecosystems and Biodiversity
Volume 5 - 2025 | doi: 10.3389/fsoil.2025.1610343
This article is part of the Research TopicInnovative Approaches to Soil Science for Remediation and Sustainable DevelopmentView all articles
Bacterial diversity in longan orchard alluvial soil is influenced by cultivation time and soil properties
Provisionally accepted
Nghia Nguyen Khoi1*
Dalma Kovacs2
Kovacs Melinda Haydee2Le Thi Xa3Lois Wright Morton4Hüseyin Barış Tecimen5Javad Robatjazif6
Jegan Sekar7
Hendra Gonsalve W Lasar6Trung Thanh Nguyen8Nguyen Minh Phuong1
Anh Thy Thi Chau1Luan Thanh Do1Kieu Oanh Thi Nguyen1- 1Can Tho University, Can Tho, Vietnam
- 2Research Institute for Analytical Instrumentation Subsidiary, Cluj-Napoca, Romania
- 3Soc Trang Community College, Soc Trang, Vietnam
- 4Iowa State University, Ames, Iowa, United States
- 5Tennessee State Museum, Nashville, Tennessee, United States
- 6Texas A and M University, College Station, Texas, United States
- 7M. S. Swaminathan Research Foundation, Tamil Nadu, India
- 8Duy Tan University, Da Nang, Vietnam
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Longan is a perennial crop and profitable export fruit well-suited to the Mekong Delta's climate and soils. Although soil deterioration in longan orchards has been studied, little research has addressed soil bacterial communities and their role in soil health. This study investigated the structure of soil bacterial communities and their associations with soil physicochemical properties in longan orchards. Soil samples were collected from longan orchards cultivated for 15 (N15), 20 (N20) and 30 years (N30) in Vinh Long Province, Vietnam. High-throughput sequencing of 16S rRNA amplicons was employed to assess bacterial diversity and community composition, followed by correlation analyses with soil properties. The dominant bacterial phyla identified across sites included Acidobacteria, Proteobacteria, Chloroflexi, Actinobacteria, and Bacteriodota. Bacterial abundance in these soils was positively correlated with sand, pH, NO3- and phosphate solubilizing microorganisms, and negatively correlated with moisture, silt, clay, NH4+, exchangeable potassium and available manganese. Longan orchard soils from all three time periods (N15, N20, N30) had more microbial species in common, than in unique ways. However, time under cultivation was an important factor, with species diversity decreasing with age. The youngest orchards (N15) exhibited the highest number of soil bacterial diversity, followed by decreasing diversity as the orchards aged (N20) and lowest at 30 years (N30). Soil properties exhibited complex and interlinked relationships with soil bacterial phyla. Overall, long-term cultivation of longan orchard soil negatively impacted microbial diversity, potentially altering key properties of soil, hence underscoring the necessity for sustainable soil management to preserve soil health and production.
Keywords: Alpha diversity, Longan, Metagenome, soil bacteria, Soil microbial diversity
Received: 14 Apr 2025; Accepted: 23 Jun 2025.
Copyright: © 2025 Nguyen Khoi, Kovacs, Haydee, Xa, Morton, Tecimen, Robatjazif, Sekar, Lasar, Nguyen, Phuong, Chau, Do and Nguyen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Nghia Nguyen Khoi, Can Tho University, Can Tho, Vietnam
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