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Trophic regulation of soil microbial biomass under nitrogen enrichment: A global meta-analysis

文献类型： 外文期刊

作者： Xing, Wen 1 ; Chen, Xinli 3 ; Thakur, Madhav P. 4 ; Kardol, Paul 6 ; Lu, Xiaoming 1 ; Bai, Yongfei 1 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China

2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China

3.Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada

4.Univ Bern, Inst Ecol & Evolut, Bern, Switzerland

5.Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland

6.Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umea, Sweden

关键词： eutrophication; meta-analysis; nematodes; soil food web; soil microbial biomass; trophic regulation

期刊名称：FUNCTIONAL ECOLOGY （ 影响因子：5.2； 五年影响因子：6.0 ）

ISSN： 0269-8463

年卷期： 2024 年 38 卷 3 期

页码：

收录情况： SCI

摘要： Eutrophication, including nitrogen (N) enrichment, can affect soil microbial communities through changes in trophic interactions. However, a knowledge gap still exists about how plant resources ('bottom-up effects') and microbial predators ('top-down effects') regulate the impacts of N enrichment on microbial biomass at the global scale. To address this knowledge gap, we conducted a global meta-analysis using 2885 paired observations from 217 publications to evaluate the regulatory effects of plant biomass and soil nematodes on soil microbial biomass under N enrichment across terrestrial ecosystems.
We found that the effects of N enrichment on soil microbial biomass varied strongly across ecosystems. N enrichment decreased the soil microbial biomass of natural grasslands and forests due to soil acidification and the subsequent losses of predatory and microbivorous nematodes stimulating microbial growth. By contrast, N enrichment increased the microbial biomass of managed croplands mainly via increasing plant biomass production. Across diverse ecosystems, the short-term N enrichment (experimental duration <= 5 years) could reduce microbial biomass via decreasing nematode abundance, whereas the long-term N enrichment (experimental duration >5 years) mainly promoted microbial biomass via increasing plant biomass.
These findings highlight the critical roles of microbial predators and plant input in shaping microbial responses to N enrichment, which are highly dependent on ecosystem type and the period of N enrichment. Earth system models that predict soil microbial biomass and their linkages to soil functioning should consider the variations in plant biomass and soil nematodes under future scenarios of N deposition.

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