globalchange  > 气候减缓与适应
DOI: 10.1029/2018JG004396
Scopus记录号: 2-s2.0-85052807788
论文题名:
Winter Ecosystem Respiration and Sources of CO2 From the High Arctic Tundra of Svalbard: Response to a Deeper Snow Experiment
作者: Lupascu M.; Czimczik C.I.; Welker M.C.; Ziolkowski L.A.; Cooper E.J.; Welker J.M.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:8
起始页码: 2627
结束页码: 2642
语种: 英语
英文关键词: graminoid tundra ; permafrost carbon ; radiocarbon ; winter
英文摘要: Currently, there is a lack of understanding on how the magnitude and sources of carbon (C) emissions from High Arctic tundra are impacted by changing snow cover duration and depth during winter. Here we investigated this issue in a graminoid tundra snow fence experiment on shale-derived gelisols in Svalbard from the end of the growing season and throughout the winter. To characterize emissions, we measured ecosystem respiration (Reco) along with its radiocarbon (14C) content. We assessed the composition of soil organic matter (SOM) by measuring its bulk-C and nitrogen (N), 14C content, and n-alkane composition. Our findings reveal that greater snow depth increased soil temperatures and winter Reco (25 mg C m−2 d−1 under deeper snow compared to 13 mg C m−2 d−1 in ambient conditions). At the end of the growing season, Reco was dominated by plant respiration and microbial decomposition of C fixed within the past 60 years (Δ14C = 62 ± 8‰). During winter, emissions were significantly older (Δ14C = −64 ± 14‰), and likely sourced from microorganisms decomposing aged SOM formed during the Holocene mixed with biotic or abiotic mineralization of the carbonaceous, fossil parent material. Our findings imply that snow cover duration and depth is a key control on soil temperatures and thus the magnitude of Reco in winter. We also show that in shallow Arctic soils, mineralization of carbonaceous parent materials can contribute significant proportions of fossil C to Reco. Therefore, permafrost-C inventories informing C emission projections must carefully distinguish between more vulnerable SOM from recently fixed biomass and more recalcitrant ancient sedimentary C sources. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113425
Appears in Collections:气候减缓与适应

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作者单位: Department of Geography, National University of Singapore, Singapore; Department of Earth System Science, University of California, Irvine, CA, United States; University Center on Svalbard, Longyearbyen, Norway; School of the Earth, Ocean and the Environment, University of South Carolina, Columbia, SC, United States; Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT-The Arctic University of Norway, Tromsø, Norway; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States; Department of Ecology and Genetics and UArctic, University of Oulu, Oulu, Finland

Recommended Citation:
Lupascu M.,Czimczik C.I.,Welker M.C.,et al. Winter Ecosystem Respiration and Sources of CO2 From the High Arctic Tundra of Svalbard: Response to a Deeper Snow Experiment[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)
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