globalchange  > 气候减缓与适应
DOI: 10.1002/2017JG004343
Scopus记录号: 2-s2.0-85044248951
论文题名:
Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau
作者: Wang Y.; Xu Y.; Spencer R.G.M.; Zito P.; Kellerman A.; Podgorski D.; Xiao W.; Wei D.; Rashid H.; Yang Y.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:3
起始页码: 1005
结束页码: 1016
语种: 英语
英文关键词: 13C NMR ; dissolved organic matter ; FT-ICR MS ; global warming ; permafrost ; Qinghai-Tibetan Plateau
Scopus关键词: alpine environment ; chemical composition ; dissolved organic matter ; global warming ; leachate ; leaching ; mass spectrometry ; meadow ; permafrost ; soil degradation ; thawing ; China ; Qinghai-Xizang Plateau
英文摘要: Ongoing global temperature rise has caused significant thaw and degradation of permafrost soils on the Qinghai-Tibetan Plateau (QTP). Leaching of organic matter from permafrost soils to aquatic systems is highly complex and difficult to reproduce in a laboratory setting. We collected samples from natural seeps of active and permafrost layers in an alpine swamp meadow on the QTP to shed light on the composition of mobilized dissolved organic matter (DOM) by combining optical measurements, ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry, radiocarbon (14C), and solid-state 13C nuclear magnetic resonance spectroscopy. Our results show that even though the active layer soils contain large amounts of proteins and carbohydrates, there is a selective release of aromatic components, whereas in the deep permafrost layer, carbohydrate and protein components are preferentially leached during the thawing process. Given these different chemical characteristics of mobilized DOM, we hypothesize that photomineralization contributes significantly to the loss of DOM that is leached from the seasonally thawed surface layer. However, with continued warming, biodegradation will become more important since biolabile materials such as protein and carbohydrate are preferentially released from deep-layer permafrost soils. This transition in DOM leachate source and associated chemical composition has ramifications for downstream fluvial networks on the QTP particularly in terms of processing of carbon and associated fluxes. ©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/114373
Appears in Collections:气候减缓与适应

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作者单位: Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai, China; Key Laboratory for Earth Surface Processes of the Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, China; National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Pontchartrain Institute for Environmental Sciences, Department of Chemistry, University of New Orleans, New Orleans, LA, United States; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Wang Y.,Xu Y.,Spencer R.G.M.,et al. Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(3)
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