Soil acidification drives the negative effects of nitrogen enrichment on soil microbial biomass at the global scale

文献类型： 外文期刊

第一作者： Li, Shucheng

作者： Li, Shucheng;Zhu, Zhihao;Li, Shucheng;Tang, Shiming;Zhang, Yujuan;Jin, Ke;Ju, Xiaotang;Chen, Hongyang

作者机构：

关键词： Nitrogen enrichment; Microbial biomass; Soil acidification; Meta-analysis

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Background and aimsNitrogen (N) deposition is a global driving factor that affects microbial biomass and ecosystem processes. However, it remains unclear whether N enrichment impacts microbial biomass in soil across ecosystems.MethodsIn this study, we synthesized 125 studies worldwide to evaluate the effects of N addition on soil microbial biomass.ResultsWe found that N enrichment substantially suppresses total microbial biomass, including bacterial, fungal, and arbuscular mycorrhizal fungi biomass. Importantly, we found strong negative effects on microbial biomass globally caused by N-enrichment-induced soil acidification. Moreover, N enrichment mainly shapes the acidification of soil through the increased concentration of ammonium and by changing exchangeable cations in soil, including magnesium, calcium, sodium, manganese, and aluminum ions.ConclusionsOverall, our findings demonstrate that N-enrichment-induced soil acidification is a crucial factor to consider for preserving microbial communities and ecosystem function under future trends of increasing N enrichment.

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