DOI: 10.1111/gcb.12784
论文题名: Living roots magnify the response of soil organic carbon decomposition to temperature in temperate grassland
作者: Hill P.W. ; Garnett M.H. ; Farrar J. ; Iqbal Z. ; Khalid M. ; Soleman N. ; Jones D.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 3 起始页码: 1368
结束页码: 1375
语种: 英语
英文关键词: SOM
; Acclimation
; Carbon cycle
; Climate change
; Mineralisation
; Priming
; Soil organic matter
; Soil respiration
Scopus关键词: acclimation
; carbon cycle
; climate change
; decomposition
; grassland
; mineralization
; organic carbon
; primary production
; root
; soil organic matter
; soil temperature
; temperature effect
; carbon
; carbon dioxide
; soil
; acclimatization
; chemistry
; grassland
; heat
; metabolism
; physiology
; plant root
; soil
; Wales
; Acclimatization
; Carbon
; Carbon Dioxide
; Grassland
; Hot Temperature
; Plant Roots
; Soil
; Wales
英文摘要: Increasing atmospheric carbon dioxide (CO2) concentration is both a strong driver of primary productivity and widely believed to be the principal cause of recent increases in global temperature. Soils are the largest store of the world's terrestrial C. Consequently, many investigations have attempted to mechanistically understand how microbial mineralisation of soil organic carbon (SOC) to CO2 will be affected by projected increases in temperature. Most have attempted this in the absence of plants as the flux of CO2 from root and rhizomicrobial respiration in intact plant-soil systems confounds interpretation of measurements. We compared the effect of a small increase in temperature on respiration from soils without recent plant C with the effect on intact grass swards. We found that for 48 weeks, before acclimation occurred, an experimental 3 °C increase in sward temperature gave rise to a 50% increase in below ground respiration (ca. 0.4 kg C m-2; Q10 = 3.5), whereas mineralisation of older SOC without plants increased with a Q10 of only 1.7 when subject to increases in ambient soil temperature. Subsequent 14C dating of respired CO2 indicated that the presence of plants in swards more than doubled the effect of warming on the rate of mineralisation of SOC with an estimated mean C age of ca. 8 years or older relative to incubated soils without recent plant inputs. These results not only illustrate the formidable complexity of mechanisms controlling C fluxes in soils but also suggest that the dual biological and physical effects of CO2 on primary productivity and global temperature have the potential to synergistically increase the mineralisation of existing soil C. © 2014 The Authors. Global Change Biology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61718
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, United Kingdom; NERC Radiocarbon Facility, Scottish Enterprise Technology Park, East Kilbride, United Kingdom; School of Biological Sciences, Bangor University, Bangor, Gwynedd, United Kingdom; Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan; Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
Recommended Citation:
Hill P.W.,Garnett M.H.,Farrar J.,et al. Living roots magnify the response of soil organic carbon decomposition to temperature in temperate grassland[J]. Global Change Biology,2015-01-01,21(3)