Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau

doi:10.1002/2017JG004343

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	Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau
	Wang, Yinghui 2; Xu, Yunping ; Spencer, Robert G. M.; Zito, Phoebe 1; Kellerman, Anne 4,6; Podgorski, David 1; Xiao, Wenjie 2; Wei, Dandan ; Rashid, Harunur ; Yang, Yuanhe 5
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
	2018
卷号	123 期号:3 页码:1005-1016
关键词	permafrost dissolved organic matter FT-ICR MS C-13 NMR Qinghai-Tibetan Plateau global warming
ISSN号	2169-8953
DOI	10.1002/2017JG004343
文献子类	Article
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 (C-14), and solid-state C-13 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.
学科主题	Environmental Sciences ; Geosciences, Multidisciplinary
电子版国际标准刊号	2169-8961
出版地	WASHINGTON
WOS关键词	CLIMATE-CHANGE ; CHEMICAL-COMPOSITION ; MOLECULAR-WEIGHT ; CARBON RELEASE ; ACTIVE LAYER ; THAW ; SPECTROSCOPY ; ECOSYSTEMS ; MASS ; BIODEGRADABILITY
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000430181200018
资助机构	NSFNational Science Foundation (NSF) [DMR-1157490] ; National Basic Research Program of ChinaNational Basic Research Program of China [2014CB954001] ; China Scholarship CouncilChina Scholarship Council
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/20737]
专题	植被与环境变化国家重点实验室
作者单位	1.Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA 2.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 4.Florida State Univ, Natl High Magnet Field Lab, Geochem Grp, Tallahassee, FL 32306 USA 5.Univ New Orleans, Dept Chem, Pontchartrain Inst Environm Sci, New Orleans, LA 70148 USA 6.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yinghui,Xu, Yunping,Spencer, Robert 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,2018,123(3):1005-1016.
APA	Wang, Yinghui.,Xu, Yunping.,Spencer, Robert G. M..,Zito, Phoebe.,Kellerman, Anne.,...&Yang, Yuanhe.(2018).Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(3),1005-1016.
MLA	Wang, Yinghui,et al."Selective Leaching of Dissolved Organic Matter From Alpine Permafrost Soils on the Qinghai-Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.3(2018):1005-1016.