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

文献类型：期刊论文

作者Wang, Yinghui1; Xu, Yunping; Spencer, Robert G. M.; Zito, Phoebe4; Kellerman, Anne2,3; Podgorski, David4; Xiao, Wenjie1; Wei, Dandan; Rashid, Harunur; Yang, Yuanhe5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
出版日期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
DOI10.1002/2017JG004343
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
出版地WASHINGTON
电子版国际标准刊号2169-8961
WOS关键词CLIMATE-CHANGE ; CHEMICAL-COMPOSITION ; MOLECULAR-WEIGHT ; CARBON RELEASE ; ACTIVE LAYER ; THAW ; SPECTROSCOPY ; ECOSYSTEMS ; MASS ; BIODEGRADABILITY
语种英语
WOS记录号WOS:000430181200018
出版者AMER GEOPHYSICAL UNION
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
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.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai, Peoples R China
2.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing, Peoples R China
3.Florida State Univ, Natl High Magnet Field Lab, Geochem Grp, Tallahassee, FL 32306 USA
4.Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
5.Univ New Orleans, Dept Chem, Pontchartrain Inst Environm Sci, New Orleans, LA 70148 USA
6.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 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.

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来源：植物研究所

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