Long-term nitrogen deposition enhances microbial capacities in soil carbon stabilization but reduces network complexity

期限(时间) 土壤碳 生物 微生物生态学 沉积(地质) 碳纤维 环境化学 生态学 氮气 氮气循环 土壤水分 化学 计算机科学 细菌 物理 算法 量子力学 复合数 古生物学 遗传学 有机化学 沉积物
作者
Xingyu Ma,Tengxu Wang,Zhou Jason Shi,Nona R. Chiariello,Kathryn M. Docherty,Christopher B. Field,Jessica Gutknecht,Qun Gao,Yunfu Gu,Xue Guo,Bruce A. Hungate,Jiesi Lei,Audrey Niboyet,Xavier Le Roux,Mengting Yuan,Tong Yuan,Jizhong Zhou,Yunfeng Yang
出处
期刊:Microbiome [Springer Nature]
卷期号:10 (1) 被引量:44
标识
DOI:10.1186/s40168-022-01309-9
摘要

Anthropogenic activities have increased the inputs of atmospheric reactive nitrogen (N) into terrestrial ecosystems, affecting soil carbon stability and microbial communities. Previous studies have primarily examined the effects of nitrogen deposition on microbial taxonomy, enzymatic activities, and functional processes. Here, we examined various functional traits of soil microbial communities and how these traits are interrelated in a Mediterranean-type grassland administrated with 14 years of 7 g m-2 year-1 of N amendment, based on estimated atmospheric N deposition in areas within California, USA, by the end of the twenty-first century.Soil microbial communities were significantly altered by N deposition. Consistent with higher aboveground plant biomass and litter, fast-growing bacteria, assessed by abundance-weighted average rRNA operon copy number, were favored in N deposited soils. The relative abundances of genes associated with labile carbon (C) degradation (e.g., amyA and cda) were also increased. In contrast, the relative abundances of functional genes associated with the degradation of more recalcitrant C (e.g., mannanase and chitinase) were either unchanged or decreased. Compared with the ambient control, N deposition significantly reduced network complexity, such as average degree and connectedness. The network for N deposited samples contained only genes associated with C degradation, suggesting that C degradation genes became more intensely connected under N deposition.We propose a conceptual model to summarize the mechanisms of how changes in above- and belowground ecosystems by long-term N deposition collectively lead to more soil C accumulation. Video Abstract.
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