Interspecific barrier effect driven by heavy metals makes soil bacterial functional assembly more stochastic

文献类型： 外文期刊

第一作者： Liu, Shuyue

作者： Liu, Shuyue;Ye, Mao;Shi, Yu;Chen, Junhao;Zhang, Zhenchang;Cao, Hengxiang;Li, Weiming

作者机构：

关键词： Barrier effect; Heavy metals; Functional assembly; Species assembly

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：7.7； 五年影响因子：7.5 ）

ISSN： 0013-9351

年卷期： 2024 年 253 卷

页码：

收录情况： SCI

摘要： Residual heavy metals in soils will destroy microbial community stability and influence its aggregation. However, exploring microbial ecology under heavy-metal stress still requires a conjoint analysis of bacterial interspecies communication and the community diversity maintenance mechanism. In this study, soil samples were collected from a heavy-metal-contaminated site in China to investigate the ecological response of indigenous microbial communities through high-throughput sequencing. Results showed that bacterial taxa and functions generated unusual decoupling phenomena. There were no significant differences in the diversity of species with the increase in concentration of heavy metals (Hg, Se, and Cr), but the functional diversity was lost. Also, the average niche breadth of bacterial species increased from 1.70 to 2.28, but community stability declined and the species assembly was always a deterministic process (NST <0.5). After the bacterial functional assembly changed from a stochastic process to a deterministic process (NST <0.5), it was transformed into a stochastic process (NST >0.5) again under the stress of high-concentration heavy metals, indicating that the collective stress resistance of bacterial communities changed from positive mutation into passive functional propagation. The research results can provide new insight into understanding the adaptive evolution of communities and ecosystem restoration under the stress of soil heavy metals.

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