Metal ions steer the duality in microbial community recovery from nitrogen enrichment by shaping functional groups,Global Change Biology

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Metal ions steer the duality in microbial community recovery from nitrogen enrichment by shaping functional groups
Global Change Biology ( IF 10.8 ) Pub Date : 2024-08-16 , DOI: 10.1111/gcb.17475
Mengmeng Chen _{1,

2} , Yao Zheng _{1,

2} , Xiufeng Zhai _{1,

2} , Fangling Ma _{1,

2} , Ji Chen ₃ , Carly Stevens ₄ , Wen-Hao Zhang _{1,

2} , Qiuying Tian ₁

Affiliation

Atmospheric nitrogen (N) deposition has been substantially reduced due to declines in the reactive N emission in major regions of the world. Nevertheless, the impact of reduced N deposition on soil microbial communities and the mechanisms by which they are regulated remain largely unknown. Here, we examined the effects of N addition and cessation of N addition on plant and soil microbial communities through a 17‐year field experiment in a temperate grassland. We found that extreme N input did not irreversibly disrupt the ecosystem, but ceasing high levels of N addition led to greater resilience in bacterial and fungal communities. Fungi exhibited diminished resilience compared to bacteria due to their heightened reliance on changes in plant communities. Neither bacterial nor fungal diversity fully recovered to their original states. Their sensitivity and resilience were mainly steered by toxic metal ions and soil pH differentially regulating on functional taxa. Specifically, beneficial symbiotic microbes such as N‐fixing bacteria and arbuscular mycorrhizal fungi experienced detrimental effects from toxic metal ions and lower pH, hindering their recovery. The bacterial functional groups involved in carbon decomposition, and ericoid mycorrhizal and saprotrophic fungi were positively influenced by soil metals, and demonstrated gradual recovery. These findings could advance our mechanistic understanding of microbial community dynamics under ongoing global changes, thereby informing management strategies to mitigate the adverse effects of N enrichment on soil function.

中文翻译：

金属离子通过塑造官能团来引导微生物群落从富氮恢复中的二元性

由于世界主要地区活性氮排放量的下降，大气氮（N）沉降已大幅减少。然而，氮沉降减少对土壤微生物群落的影响及其调节机制仍然很大程度上未知。在这里，我们通过在温带草原进行了 17 年的田间实验，研究了添加和停止添加氮对植物和土壤微生物群落的影响。我们发现，极端的氮输入不会不可逆转地破坏生态系统，但停止高水平的氮添加会导致细菌和真菌群落的恢复能力更强。与细菌相比，真菌表现出较低的恢复能力，因为它们对植物群落变化的高度依赖。细菌和真菌的多样性都没有完全恢复到原来的状态。它们的敏感性和恢复力主要受有毒金属离子和土壤pH值对功能类群的差异调节的影响。具体来说，有益的共生微生物，如固氮细菌和丛枝菌根真菌，受到有毒金属离子和较低pH值的不利影响，阻碍了它们的恢复。参与碳分解的细菌功能群、蓟马菌根和腐生真菌受到土壤金属的积极影响，并逐渐恢复。这些发现可以增进我们对持续全球变化下微生物群落动态的机制理解，从而为减轻氮富集对土壤功能的不利影响的管理策略提供信息。

更新日期：2024-08-16

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