DOI: 10.1111/gcb.14154
Scopus记录号: 2-s2.0-85048220296
论文题名: Microbial mechanisms of carbon priming effects revealed during the interaction of crop residue and nutrient inputs in contrasting soils
作者: Fang Y. ; Nazaries L. ; Singh B.K. ; Singh B.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 7 起始页码: 2775
结束页码: 2790
语种: 英语
英文关键词: 13C isotope
; copiotrophs
; enzymatic stoichiometry
; extracellular enzyme activity
; gene abundance
; oligotrophs
Scopus关键词: carbon isotope
; carbon sequestration
; crop residue
; enzyme activity
; gene
; nutrient
; soil organic matter
; stoichiometry
; Acidobacteria
; Bacteria (microorganisms)
; Betaproteobacteria
; Fungi
; Triticum aestivum
英文摘要: Agronomic practices such as crop residue return and additional nutrient supply are recommended to increase soil organic carbon (SOC) in arable farmlands. However, changes in the priming effect (PE) on native SOC mineralization in response to integrated inputs of residue and nutrients are not fully known. This knowledge gap along with a lack of understanding of microbial mechanisms hinders the ability to constrain models and to reduce the uncertainty to predict carbon (C) sequestration potential. Using a 13C-labeled wheat residue, this 126-day incubation study examined the dominant microbial mechanisms that underpin the PE response to inputs of wheat residue and nutrients (nitrogen, phosphorus and sulfur) in two contrasting soils. The residue input caused positive PE through “co-metabolism,” supported by increased microbial biomass, C and nitrogen (N) extracellular enzyme activities (EEAs), and gene abundance of certain microbial taxa (Eubacteria, β-Proteobacteria, Acidobacteria, and Fungi). The residue input could have induced nutrient limitation, causing an increase in the PE via “microbial nutrient mining” of native soil organic matter, as suggested by the low C-to-nutrient stoichiometry of EEAs. At the high residue, exogenous nutrient supply (cf. no-nutrient) initially decreased positive PE by alleviating nutrient mining, which was supported by the low gene abundance of Eubacteria and Fungi. However, after an initial decrease in PE at the high residue with nutrients, the PE increased to the same magnitude as without nutrients over time. This suggests the dominance of “microbial stoichiometry decomposition,” supported by higher microbial biomass and EEAs, while Eubacteria and Fungi increased over time, at the high residue with nutrients cf. no-nutrient in both soils. Our study provides novel evidence that different microbial mechanisms operate simultaneously depending on organic C and nutrient availability in a residue-amended soil. Our results have consequences for SOC modeling and integrated nutrient management employed to increase SOC in arable farmlands. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110335
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, NSW, Australia; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia; Global Centre for Land-Based Innovation, Western Sydney University, Penrith, NSW, Australia
Recommended Citation:
Fang Y.,Nazaries L.,Singh B.K.,et al. Microbial mechanisms of carbon priming effects revealed during the interaction of crop residue and nutrient inputs in contrasting soils[J]. Global Change Biology,2018-01-01,24(7)