Microbial Community Response to Alpine Meadow Degradation and Its Impact on Soil Nutrient Cycling

• Published in: Agronomy (Basel) 2024-01, Vol.14 (1), p.195
• Main Authors: Wu, Yanru, Yang, Wenquan, Li, Qinyao, Qiao, Qianluo, Zhao, Shuai, Zhang, Yangcan, Yu, Yanghua, Zhang, Shengxiang, Li, Xilai, Kou, Jiancun
• Format: Article
• Language: English
• Subjects: Abundance; Analysis; Biodegradation; Biodiversity; Bioinformatics; Biological diversity; biomarker; Climate change; Composition; Cycles; Degradation; degraded alpine meadows; Ecological function; Ecosystems; Environmental degradation; functional prediction; Fungi; Genes; Genetic testing; Grasslands; Meadows; Microbial activity; Microbiomes; Microorganisms; Mountain ecology; Next-generation sequencing; Nutrient content; Nutrient cycles; nutrient cycling; Physicochemical properties; Physiological aspects; Plant growth; Relative abundance; Soil degradation; Soil microbiology; Soil microorganisms; Soil nutrients; Soil structure; Soils; Species composition; Species diversity; Sustainable development; Taxa; Taxonomy; Thermal cycling; Water conservation
• ISSN: 2073-4395; 2073-4395
• DOI: 10.3390/agronomy14010195

The degradation of alpine meadows on the Qinghai–Tibet Plateau is a major issue affecting both the ecology and the economy. Microorganisms play an important role in soil nutrient cycling and the regulation of ecosystem function. This study aimed to investigate the species composition and diversity of microbial communities and understand the response of microbial communities to changes in physicochemical properties resulting from meadow degradation. In this study, the soil bacterial and fungal communities’ composition and diversity of alpine meadows of degradation gradient were sequenced by high-throughput sequencing. During the process of grassland degradation, there were 59 bacterial taxa and 29 fungal taxa showing significant differences. The relative abundance of meadow pathogenic fungi significantly increased (p < 0.05). PICRUSt2 analysis showed a decrease in synthesis-related functional gene abundance and an increase in metabolism-related functional gene abundance. FUNGuild analysis showed that symbiotic and saprophytic nutrient fungi decreased significantly (p < 0.05). The soil nutrient cycling was mainly influenced by the beta diversity of microbial communities. Grassland degradation affects soil structure, thereby affecting the diversity of soil microbial composition and functional soil nutrient content. This work reveals the response of microbial communities to the degradation of alpine meadows and their impact on nutrient cycling, providing theoretical support for the protection and sustainable development of alpine meadows.