Key Laboratory of Urban Environment and Health, Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
Sci Total Environ. 2023 Oct 10;894:165056. doi: 10.1016/j.scitotenv.2023.165056. Epub 2023 Jun 20.
Soil microbial communities have resistance to environmental stresses and thus can maintain ecosystem functions such as decomposition, nutrient provisioning, and plant pathogen control. However, predominant factors driving community resistance of soil microbiome to heavy metal pollution stresses and ecosystem functional stability are still unclear, limiting our ability to forecast how soil pollution might affect ecosystem sustainability. Here, we conducted microcosm experiments to estimate the importance of soil microbiome in predicting community resistance to heavy metal mercury (Hg) stress in paired paddy and upland fields. We found that community resistance of soil microbiome was strongly correlated with ecosystem functional stability, so were the individual groups of organisms such as bacteria, saprotrophic fungi, and phototrophic protists. The core phylotypes within soil microbiome had a major contribution to community resistance, which was essential for the maintenance of functional stability. Co-occurrence network further confirmed that community resistances of main ecological clusters were positively correlated with ecosystem functional stability. Together, our results provide new insights into the link between community resistance and functional stability, and highlight the importance of core microbiota in driving community resistance to environmental stresses and maintain functional stability.
土壤微生物群落具有抵抗环境压力的能力，因此可以维持生态系统功能，如分解、养分供应和植物病原体控制。然而，主导土壤微生物群落对重金属污染压力和生态系统功能稳定性的社区抗性的因素仍不清楚，限制了我们预测土壤污染如何影响生态系统可持续性的能力。在这里，我们进行了微宇宙实验，以估计土壤微生物群落在预测水稻和旱地土壤中对重金属汞（Hg）胁迫的群落抗性方面的重要性。我们发现，土壤微生物群落的群落抗性与生态系统功能稳定性密切相关，细菌、腐生真菌和光养原生动物等单个生物群体也是如此。土壤微生物群落内的核心分类群对群落抗性有很大贡献，这对于维持功能稳定性至关重要。共现网络进一步证实了主要生态类群的群落抗性与生态系统功能稳定性呈正相关。总之，我们的研究结果为群落抗性与功能稳定性之间的联系提供了新的见解，并强调了核心微生物群在驱动群落对环境压力的抗性和维持功能稳定性方面的重要性。
