Zhou Zhenghu, Zheng Mianhai, Xia Jianyang, Wang Chuankuan
Center for Ecological Research, Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China.
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Sci Total Environ. 2022 Feb 1;806(Pt 2):150569. doi: 10.1016/j.scitotenv.2021.150569. Epub 2021 Sep 28.
Nitrogen (N) deposition is one of major environmental concerns and alters the microbial communities in the pedosphere. A central debate in governing microbial community is on the relative importance of deterministic (ecological selection) vs. stochastic processes (dispersal, drift, diversification or speciation), which consequently limited our understanding of microbial assembly in response to N addition. Here, we conducted a global analysis of high-throughput sequencing data to reveal the mechanisms of N-addition effects on soil microbial communities. The results show that N addition significantly shifted the microbial community structure and promoted microbial beta diversity, particularly in the N-limited ecosystems. Changes in microbial structure and beta diversity increased significantly as the N addition rate, study duration, and the degree of soil acidification increased. The stochastic processes are more important than the deterministic processes for microbial community assembly, while N addition significantly increase the importance of stochastic processes whether the phylogenetic relationship is considered or not. Overall, the current study highlights the important of ecological stochasticity in regulating microbial assembly under N deposition scenarios.
氮（N）沉降是主要的环境问题之一，会改变土壤圈中的微生物群落。微生物群落调控的一个核心争论在于确定性过程（生态选择）与随机过程（扩散、漂移、多样化或物种形成）的相对重要性，这因此限制了我们对添加氮后微生物组装的理解。在此，我们对高通量测序数据进行了全球分析，以揭示添加氮对土壤微生物群落的影响机制。结果表明，添加氮显著改变了微生物群落结构并促进了微生物的β多样性，特别是在氮限制的生态系统中。随着添加氮的速率、研究持续时间以及土壤酸化程度的增加，微生物结构和β多样性的变化显著增加。对于微生物群落组装而言，随机过程比确定性过程更为重要，而无论是否考虑系统发育关系，添加氮都会显著增加随机过程的重要性。总体而言，当前研究突出了生态随机性在氮沉降情景下调节微生物组装的重要性。
