DOI: 10.1111/gcb.12029
论文题名: How interactions between microbial resource demands, soil organic matter stoichiometry, and substrate reactivity determine the direction and magnitude of soil respiratory responses to warming
作者: Billings S.A. ; Ballantyne F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 1 起始页码: 90
结束页码: 102
语种: 英语
英文关键词: Arrhenius function
; Heterotrophic respiration
; Microbial adaptation
; Nitrogen mineralization
; Organic matter decomposition
; Soil organic carbon
; Soil respiration
; Soil warming
; Stoichiometry
; Substrate quality
Scopus关键词: calcium
; nitrogen
; activation energy
; biogeochemistry
; biomass
; community structure
; decomposition
; enzyme
; heterotrophy
; microbial community
; mineralization
; organic carbon
; physiology
; soil carbon
; soil organic matter
; soil respiration
; soil temperature
; stoichiometry
; substrate
; greenhouse effect
; metabolism
; microbiology
; review
; soil
; Calcium
; Global Warming
; Nitrogen
; Soil
; Soil Microbiology
英文摘要: Recent empirical and theoretical advances inform us about multiple drivers of soil organic matter (SOM) decomposition and microbial responses to warming. Absent from our conceptual framework of how soil respiration will respond to warming are adequate links between microbial resource demands, kinetic theory, and substrate stoichiometry. Here, we describe two important concepts either insufficiently explored in current investigations of SOM responses to temperature, or not yet addressed. First, we describe the complete range of responses for how warming may change microbial resource demands, physiology, community structure, and total biomass. Second, we describe how any relationship between SOM activation energy of decay and carbon (C) and nitrogen (N) stoichiometry can alter the relative availability of C and N as temperature changes. Changing availabilities of C and N liberated from their organic precursors can feedback to microbial resource demands, which in turn influence the aggregated respiratory response to temperature we observe. An unsuspecting biogeochemist focused primarily on temperature sensitivity of substrate decay thus cannot make accurate projections of heterotrophic CO2 losses from diverse organic matter reservoirs in a warming world. We establish the linkages between enzyme kinetics, SOM characteristics, and potential for microbial adaptation critical for making such projections. By examining how changing microbial needs interact with inherent SOM structure and composition, and thus reactivity, we demonstrate the means by which increasing temperature could result in increasing, unchanging, or even decreasing respiration rates observed in soils. We use this exercise to highlight ideas for future research that will develop our abilities to predict SOM feedbacks to climate. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62578
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Ecology and Evolutionary Biology, Kansas Biological Survey, University of Kansas, Lawrence, KS 66047, United States
Recommended Citation:
Billings S.A.,Ballantyne F.. How interactions between microbial resource demands, soil organic matter stoichiometry, and substrate reactivity determine the direction and magnitude of soil respiratory responses to warming[J]. Global Change Biology,2013-01-01,19(1)