globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13400
论文题名:
Methane oxidation in contrasting soil types: responses to experimental warming with implication for landscape-integrated CH4 budget
作者: D'Imperio L.; Nielsen C.S.; Westergaard-Nielsen A.; Michelsen A.; Elberling B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:2
起始页码: 966
结束页码: 976
语种: 英语
英文关键词: Arctic ; bare soil ; dry heath ; Greenland ; methane budget ; methane uptake ; soil moisture ; warming
英文摘要: Arctic ecosystems are characterized by a wide range of soil moisture conditions and thermal regimes and contribute differently to the net methane (CH4) budget. Yet, it is unclear how climate change will affect the capacity of those systems to act as a net source or sink of CH4. Here, we present results of in situ CH4 flux measurements made during the growing season 2014 on Disko Island (west Greenland) and quantify the contribution of contrasting soil and landscape types to the net CH4 budget and responses to summer warming. We compared gas flux measurements from a bare soil and a dry heath, at ambient conditions and increased air temperature, using open-top chambers (OTCs). Throughout the growing season, bare soil consumed 0.22 ± 0.03 g CH4-C m−2 (8.1 ± 1.2 g CO2-eq m−2) at ambient conditions, while the dry heath consumed 0.10 ± 0.02 g CH4-C m−2 (3.9 ± 0.6 g CO2-eq m−2). These uptake rates were subsequently scaled to the entire study area of 0.15 km2, a landscape also consisting of wetlands with a seasonally integrated methane release of 0.10 ± 0.01 g CH4-C m−2 (3.7 ± 1.2 g CO2-eq m−2). The result was a net landscape sink of 12.71 kg CH4-C (0.48 tonne CO2-eq) during the growing season. A nonsignificant trend was noticed in seasonal CH4 uptake rates with experimental warming, corresponding to a 2% reduction at the bare soil, and 33% increase at the dry heath. This was due to the indirect effect of OTCs on soil moisture, which exerted the main control on CH4 fluxes. Overall, the net landscape sink of CH4 tended to increase by 20% with OTCs. Bare and dry tundra ecosystems should be considered in the net CH4 budget of the Arctic due to their potential role in counterbalancing CH4 emissions from wetlands – not the least when taking the future climatic scenarios of the Arctic into account. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
资助项目: We gratefully acknowledge the financial support from the Danish National Research Foundation (CENPERM DNRF100). We would like to thank Jens Gammeltoft for technical assistance in the field and Maja Holm Wahlgren and Gosha Sylvester for running laboratory analyses. We thank Katrine Wulff for laboratory assistance and soil samples collection at the water-logged area. We also would like to thank two anonymous reviewers for very useful comments.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61073
Appears in Collections:影响、适应和脆弱性

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作者单位: Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; Section for Forest, Nature and Biomass, Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, Frederiksberg, Denmark; Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark

Recommended Citation:
D'Imperio L.,Nielsen C.S.,Westergaard-Nielsen A.,et al. Methane oxidation in contrasting soil types: responses to experimental warming with implication for landscape-integrated CH4 budget[J]. Global Change Biology,2017-01-01,23(2)
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