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

Microbiome - Tập 10 - Trang 1-13 - 2022
Xingyu Ma1,2, Tengxu Wang1,3, Zhou Shi4, Nona R. Chiariello5, Kathryn Docherty6, Christopher B. Field5, Jessica Gutknecht7,8, Qun Gao1, Yunfu Gu9, Xue Guo1, Bruce A. Hungate10, Jiesi Lei1, Audrey Niboyet11,12, Xavier Le Roux13, Mengting Yuan4,14, Tong Yuan4, Jizhong Zhou4,15, Yunfeng Yang1
1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
2China Urban Construction Design & Research Institute Co., Ltd, Beijing, China
3North China Municipal Engineering Design & Research Institute Co., Ltd., the Beijing Branch, Beijing, China
4Institute for Environmental Genomics and Department of Microbiology and Plant Biology, University of Oklahoma, Norman, USA
5Department of Global Ecology, Carnegie Institution for Science, Stanford, USA
6Department of Biological Sciences, Western Michigan University, Kalamazoo, USA
7Department of Soil Ecology, Helmholtz Centre for Environmental Research–UFZ, Halle, Germany
8Present Address: Department of Soil, Water, and Climate, University of Minnesota, Saint Paul, USA
9Department of Microbiology, College of Resource, Sichuan Agricultural University, Chengdu, China
10Center for Ecosystem Science and Society and Department of Biological Sciences, Northern Arizona University, Flagstaff, USA
11Sorbonne Université, Université Paris Cité, UPEC, CNRS, INRAE, IRD, Institut d’Ecologie et des Sciences de l’Environnement de Paris, iEES-Paris, Paris, France
12AgroParisTech, Paris, France
13Microbial Ecology Centre LEM, INRAE, CNRS, University of Lyon, University Lyon 1, VetAgroSup, UMR INRAE 1418, Villeurbanne, France
14Department of Environmental Science, Policy and Management, University of California Berkeley, Berkeley, USA
15Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA

Tóm tắt

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.

Tài liệu tham khảo

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