DOI: 10.1016/j.geoderma.2019.114122
论文题名: C:N stoichiometry of stable and labile organic compounds determine priming patterns
作者: Liu M. ; Qiao N. ; Xu X. ; Fang H. ; Wang H. ; Kuzyakov Y.
刊名: Geoderma
ISSN: 167061
出版年: 2020
卷: 362 语种: 英语
英文关键词: Climate change
; Labile organic carbon
; Nitrate and ammonium
; Organic matter decomposition
; Priming effects
; Stoichiometry
Scopus关键词: Biogeochemistry
; Climate change
; Glucose
; Meteorological problems
; Nitrates
; Organic carbon
; Soils
; Stoichiometry
; Atmospheric depositions
; Energy limitations
; Leaf litter decomposition
; Organic matter decomposition
; Organic soil horizons
; Priming effects
; Stoichiometric ratio
; Subtropical forests
; Decay (organic)
; ammonium
; decomposition
; nitrate
; nitrogen
; organic carbon
; soil organic matter
; stable isotope
; stoichiometry
英文摘要: Priming effects (PE) can greatly influence global carbon (C) storage in soil and lead to climate feedbacks by accelerating the decomposition of organic matter (OM). Although nitrogen (N) availability can alter the magnitude and direction of priming (stoichiometric constrains), it remains unclear whether additions of NO3 − (nitrate) and NH4 + (ammonium) have distinct effects on the decomposition of various OM. Thus, the aims of this study were to investigate the responses of OM decomposition along a decay continuum (i.e. decreasing decomposition degree) to labile C and N inputs and determine the PE induced by the two N forms. Four OM forms, namely leaf litter, wood litter, organic soil horizon, and mineral soil, with a broad range of C:N ratios were collected along a decay continuum in a typical subtropical forest and incubated for 38 days with labile C (13C labeled glucose) and N (NO3 −) additions. Based on the very broad range of C:N ratios in OM in soil and inputs of labile C and N, we demonstrated the OM decomposition within a decay continuum as well as PE intensities and the thresholds for the switch of PE directions. In contrast to NH4 + additions, NO3 − generally accelerated the decomposition of all OM. Priming of plant litter was dependent on the C:N ratios of the labile inputs. However, leaf litter decomposition was more controlled by N addition than wood litter. Glucose addition greatly increased the priming of OM decomposition in soils, demonstrating energy limitation for microorganisms. Distinct priming patterns were observed between NO3 − and NH4 + additions, both for the individual OM types and for all four types of OM. On a basis of C balance between primed C and the remaining added C, PE induced by labile C and N inputs can increase or reduce C sequestration depending on C:N stoichiometric ratios of labile inputs. Our findings provide important insights into the specific role of NO3 − or NH4 + together with labile C inputs (e.g. from root exudation), and thus changes in the composition of deposited N (atmospheric deposition and fertilization) may induce distinct climate feedbacks. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158707
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang District, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Yanqi Lake, Huairou District, Beijing, 101408, China; Department of Agricultural Soil Science, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
Recommended Citation:
Liu M.,Qiao N.,Xu X.,et al. C:N stoichiometry of stable and labile organic compounds determine priming patterns[J]. Geoderma,2020-01-01,362