DOI: 10.1002/2017JG003956
Scopus记录号: 2-s2.0-85044852172
论文题名: Process-Oriented Modeling of a High Arctic Tundra Ecosystem: Long-Term Carbon Budget and Ecosystem Responses to Interannual Variations of Climate
作者: Zhang W. ; Jansson P.-E. ; Schurgers G. ; Hollesen J. ; Lund M. ; Abermann J. ; Elberling B.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 4 起始页码: 1178
结束页码: 1196
语种: 英语
英文关键词: carbon budget
; CoupModel
; high Arctic
; interannual variations
; nongrowing season
; permafrost
Scopus关键词: active layer
; annual variation
; arctic environment
; belowground biomass
; carbon sequestration
; climate effect
; decomposition
; ecosystem response
; environmental conditions
; environmental effect
; heathland
; humus
; permafrost
; primary production
; source-sink dynamics
; tundra
; warming
; Arctic
; Greenland
; Cassiope tetragona
英文摘要: Terrestrial carbon (C) cycling in high Arctic tundra depends on ecosystem responses to climatic warming and concurrent changes in environmental conditions. There are very few studies to quantify long-term C budget in high Arctic tundra due to lack of sufficient measurements. Here based on well-established multiyear measurements, we calibrated a process-oriented model (CoupModel) to quantify various components of the C budget at a Cassiope tetragona heath ecosystem in northeast Greenland. Net ecosystem exchange of CO2 (NEE) for 2000–2014 was estimated at −15 ± 10 g C m−2 yr−1. Ecosystem respiration (ER) for nongrowing seasons was estimated at 10.3 ± 5.3 g C m−2 yr−1, representing around 13% of the annual ER. Significant trends for interannual variations of aboveground and belowground C fluxes and stocks were found for the subperiods (i.e., 2000–2008 and 2008–2014) but not for the entire period. Interannual variations of NEE largely relied on the response of gross primary production (GPP) and ER to seasonal changes in climate. Moreover, the model showed that interannual variations of GPP, ER, and NEE had a much higher linear correlation with July temperature and annual maximum thawing depth (ALDmax) than other climatic and site characteristics. ALDmax had the highest correlation with the decomposition rate of humus C. Overall, this modeling study suggests that a sink-source transition of the studied ecosystem depends on ecosystem responses to interannual variations of climate and that the net C balance may be sensitive to summer warmth and active layer thickness. ©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/114220
Appears in Collections: 气候减缓与适应
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作者单位: Center for Permafrost, Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; Department of Conservation and Natural Sciences, The National Museum of Denmark, Lyngby, Denmark; Department of Bioscience, Arctic Research Center, Aarhus University, Roskilde, Denmark; Asiaq, Greenland Survey, Nuuk, Greenland
Recommended Citation:
Zhang W.,Jansson P.-E.,Schurgers G.,et al. Process-Oriented Modeling of a High Arctic Tundra Ecosystem: Long-Term Carbon Budget and Ecosystem Responses to Interannual Variations of Climate[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(4)