DOI: 10.1007/s10533-014-0008-9
Scopus记录号: 2-s2.0-84918776773
论文题名: Process-based isotope partitioning of winter soil respiration in a subalpine ecosystem reveals importance of rhizospheric respiration
作者: Tucker C.L. ; Young J.M. ; Williams D.G. ; Ogle K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 2 起始页码: 389
结束页码: 408
语种: 英语
英文关键词: Glacier Lakes Ecosystem Experiments Site
; Hierarchical Bayesian
; Soil carbon efflux
; Stable isotope mixing model
; Sub-alpine forest
; Winter ecology
英文摘要: Deep snow in sub-alpine ecosystems may reduce or eliminate soil freezing, thus contributing to the potential for winter soil respiration to account for a significant fraction of annual CO2 efflux to the atmosphere. Quantification of carbon loss from soils requires separation of respiration produced by roots and rhizosphere organisms from that produced by heterotrophic, decomposer organisms because the former does not result in a net loss of stored carbon. Our objective was to quantify winter soil respiration rates in a sub-alpine forest and meadow, and to partition that flux into its rhizosphere and heterotrophic components. We were particularly interested in comparing early winter soil respiration to late winter/early spring soil respiration of each component because previous work has shown a consistent increase in soil respiration of subalpine systems from early winter to late winter/spring. Field data on the total soil CO2 flux and its carbon isotope composition were coupled with data from laboratory incubations using a novel process-based stable isotope mixing model implemented in a hierarchical Bayesian framework. We found that soil respiration generally increased from early to later winter and was greatest mid-summer. After correcting for the effect of wind on snowpack δ13C–CO2, the δ13C of soil-respired CO2 varied little over winter, and the contributions of rhizospheric (~35 %) and heterotrophic (~65 %) respiration were relatively constant. The significance of winter respiration from the rhizosphere and apparent coupling of increases in rhizospheric and heterotrophic respiration in late winter are likely to be important for predicting changes in soil carbon in sub-alpine ecosystems. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83695
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Institute of Arctic Biology, University of Alaska, Fairbanks, PO Box 757000, Fairbanks, AK, United States; International Arctic Research Center, University of Alaska, Fairbanks, PO Box 757340, Fairbanks, AK, United States; Department of Botany, University of Wyoming, Dept. 3165, 1000 E. University Ave, Laramie, WY, United States; Program in Ecology, University of Wyoming, 1000 E. University Ave, Laramie, WY, United States; School of Life Sciences, Arizona State University, PO Box 874501, Tempe, AZ, United States
Recommended Citation:
Tucker C.L.,Young J.M.,Williams D.G.,et al. Process-based isotope partitioning of winter soil respiration in a subalpine ecosystem reveals importance of rhizospheric respiration[J]. Biogeochemistry,2014-01-01,121(2)