DOI: 10.1029/2017JG004227
Scopus记录号: 2-s2.0-85051039717
论文题名: Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra
作者: Wilkman E. ; Zona D. ; Tang Y. ; Gioli B. ; Lipson D.A. ; Oechel W.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2287
结束页码: 2302
语种: 英语
英文关键词: flux partitioning
; ice wedge polygons
; microtopography
; permafrost
; Q10
Scopus关键词: Embryophyta
英文摘要: Predictions of the response of ecosystem respiration to warming in the Arctic are not well constrained, partly due to the considerable spatial heterogeneity of these permafrost-dominated areas. Accurate calculations of in situ temperature sensitivities of respiration (Q10) are vital for the prediction of future Arctic emissions. To understand the impact of spatial heterogeneity on respiration rates and Q10, we compared respiration measured from automated chambers across the main local polygonized landscape forms (high and low centers, polygon rims, polygon troughs) to estimates from the flux-partitioned net ecosystem exchange collected in an adjacent eddy covariance tower. Microtopographic type appears to be the most important variable explaining the variability in respiration rates, and low-center polygons and polygon troughs show the greatest cumulative respiration rates, possibly linked to their deeper thaw depth and higher plant biomass. Regardless of the differences in absolute respiration rates, Q10 is surprisingly similar across all microtopographic features, possibly indicating a similar temperature limitation to decomposition across the landscape. Q10 was higher during the colder early summer and lower during the warmer peak growing season, consistent with an elevated temperature sensitivity under colder conditions. The respiration measured by the chambers and the estimates from the daytime flux-partitioned eddy covariance data were within uncertainties during early and peak seasons but overestimated respiration later in the growing season. Overall, this study suggests that it is possible to simplify estimates of the temperature sensitivity of respiration across heterogeneous landscapes but that seasonal changes in Q10 should be incorporated into model simulations. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113620
Appears in Collections: 气候减缓与适应
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作者单位: Department of Biology, San Diego State University, San Diego, CA, United States; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom; Istituto di Biometeorologia, Consiglio Nazionale delle Ricerche, Florence, Italy; Department of Physical Geography, University of Exeter, Exeter, United Kingdom
Recommended Citation:
Wilkman E.,Zona D.,Tang Y.,et al. Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)