DOI: 10.1111/gcb.12036
论文题名: Does declining carbon-use efficiency explain thermal acclimation of soil respiration with warming?
作者: Tucker C.L. ; Bell J. ; Pendall E. ; Ogle K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 1 起始页码: 252
结束页码: 263
语种: 英语
英文关键词: Artemisia tridentata
; Carbon-climate feedback
; Hierarchical Bayesian
; Michaelis-Menten
; Microbial biomass
; Sagebrush steppe
; Soil ecology
; Soil incubation
; Soil respiration
; Temperature acclimation
Scopus关键词: carbon
; acclimation
; atmospheric chemistry
; Bayesian analysis
; biomass
; carbon dioxide
; concentration (composition)
; global warming
; hierarchical system
; soil organic matter
; soil respiration
; temperature
; article
; biomass
; greenhouse effect
; microbiology
; season
; soil
; temperature
; theoretical model
; Biomass
; Carbon
; Global Warming
; Models, Theoretical
; Seasons
; Soil
; Soil Microbiology
; Temperature
; Artemisia
; Artemisia tridentata
英文摘要: Enhanced soil respiration in response to global warming may substantially increase atmospheric CO2 concentrations above the anthropogenic contribution, depending on the mechanisms underlying the temperature sensitivity of soil respiration. Here, we compared short-term and seasonal responses of soil respiration to a shifting thermal environment and variable substrate availability via laboratory incubations. To analyze the data from incubations, we implemented a novel process-based model of soil respiration in a hierarchical Bayesian framework. Our process model combined a Michaelis-Menten-type equation of substrate availability and microbial biomass with an Arrhenius-type nonlinear temperature response function. We tested the competing hypotheses that apparent thermal acclimation of soil respiration can be explained by depletion of labile substrates in warmed soils, or that physiological acclimation reduces respiration rates. We demonstrated that short-term apparent acclimation can be induced by substrate depletion, but that decreasing microbial biomass carbon (MBC) is also important, and lower MBC at warmer temperatures is likely due to decreased carbon-use efficiency (CUE). Observed seasonal acclimation of soil respiration was associated with higher CUE and lower basal respiration for summer- vs. winter-collected soils. Whether the observed short-term decrease in CUE or the seasonal acclimation of CUE with increased temperatures dominates the response to long-term warming will have important consequences for soil organic carbon storage. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62571
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Botany, University of Wyoming, 3165 1000 E. University Avenue, Laramie, WY 82071, United States; University of Wyoming, Laramie, WY 82071, United States; School of Life Sciences, Arizona State University, 427 E. Taylor Mall, Tempe, AZ 85287, United States
Recommended Citation:
Tucker C.L.,Bell J.,Pendall E.,et al. Does declining carbon-use efficiency explain thermal acclimation of soil respiration with warming?[J]. Global Change Biology,2013-01-01,19(1)