Di Kang, Yuanyuan Chen, Shishi Feng, Qianmin Liu, Shuzhen Zou
Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Nanchong 637009, China.
Key Laboratory of Environmental Science and Biodiversity Conservation (Sichuan Province), China West Normal University, Nanchong 637009, China.
iScience. 2025 Apr 21;28(5):112494. doi: 10.1016/j.isci.2025.112494. eCollection 2025 May 16.
This study investigates soil microbial community dynamics in high-altitude wetlands on the Qinghai-Tibet Plateau under drought conditions. It compares the composition, structure, and assembly mechanisms of microbial communities in water-rich and water-deficient wetlands. The results show that while α diversity remains stable after aridification, the community undergoes significant phylum reorganization. Aridification leads to increased sensitivity in the β diversity of archaea and bacteria to environmental and geographic factors, while fungal β diversity remains unchanged. Co-occurrence network analysis reveals a more complex and denser microbial network in aridified wetlands. Hub microbial groups are found only in bacteria and fungi, and their richness decreases after aridification. The study suggests a shift from a neutral to a partially deterministic assembly process, marked by reduced dispersal limitations and stronger heterogeneous selections. These findings contribute to understanding microbial community evolution in response to global environmental changes.
本研究调查了干旱条件下青藏高原高海拔湿地土壤微生物群落动态。比较了富水和缺水湿地微生物群落的组成、结构和组装机制。结果表明，干旱化后α多样性保持稳定，但群落发生了显著的门类重组。干旱化导致古菌和细菌的β多样性对环境和地理因素的敏感性增加，而真菌β多样性保持不变。共现网络分析表明，干旱化湿地中的微生物网络更复杂、更密集。枢纽微生物类群仅在细菌和真菌中发现，干旱化后其丰富度降低。该研究表明组装过程从随机向部分确定性转变，其特征是扩散限制减少和非均匀选择增强。这些发现有助于理解微生物群落对全球环境变化的进化响应。
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