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Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai-Tibet Plateau: importance of source and permafrost degradation

文献类型：期刊论文

作者Wang, Yinghui6; Spencer, Robert G. M.; Podgorski, David C.; Kellerman, Anne M.; Rashid, Harunur; Zito, Phoebe3; Xiao, Wenjie6; Wei, Dandan; Yang, Yuanhe2; Xu, Yunping
刊名BIOGEOSCIENCES
出版日期2018
卷号15期号:21页码:6637-6648
ISSN号1726-4170
DOI10.5194/bg-15-6637-2018
文献子类Article
英文摘要The Qinghai-Tibet Plateau (QTP) accounts for approximately 70% of global alpine permafrost and is an area sensitive to climate change. The thawing and mobilization of ice-rich and organic-carbon-rich permafrost impact hydrologic conditions and biogeochemical processes on the QTP. Despite numerous studies of Arctic permafrost, there are no reports to date for the molecular-level in-stream processing of permafrost-derived dissolved organic matter (DOM) on the QTP. In this study, we examine temporal and spatial changes of DOM along an alpine stream (3850-3207 m above sea level) by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), accelerator mass spectrometry (AMS) and UV-visible spectroscopy. Compared to downstream sites, dissolved organic matter (DOM) at the headstream site exhibited older radiocarbon age, higher mean molecular weight, higher aromaticity and fewer highly unsaturated compounds. At the molecular level, 6409 and 1345 formulas were identified as unique to the active layer (AL) leachate and permafrost layer (PL) leachate, respectively. Comparing permafrost leachates to the downstream site, 59% of AL-specific formulas and 90% of PL-specific formulas were degraded, likely a result of rapid in-stream degradation of permafrost-derived DOM. From peak discharge in the summer to low flow in late autumn, the DOC concentration at the headstream site decreased from 13.9 to 10.2 mg L-1, while the C-14 age increased from 745 to 1560 years before present (BP), reflecting an increase in the relative contribution of deep permafrost carbon due to the effect of changing hydrological conditions over the course of the summer on the DOM source (AL vs. PL). Our study thus demonstrates that hydrological conditions impact the mobilization of permafrost carbon in an alpine fluvial network, the signature of which is quickly lost through in-stream mineralization and transformation.
学科主题Ecology ; Geosciences, Multidisciplinary
出版地GOTTINGEN
电子版国际标准刊号1726-4189
WOS关键词SOLID-PHASE EXTRACTION ; MOLECULAR-WEIGHT ; CHEMICAL-COMPOSITION ; CARBON DOC ; MASS ; PERSISTENCE ; RESOLUTION ; CLIMATE ; THAW ; SOIL
语种英语
WOS记录号WOS:000449542900002
出版者COPERNICUS GESELLSCHAFT MBH
资助机构National Basic Research Program of ChinaNational Basic Research Program of China [2014CB954001] ; China Scholarship CouncilChina Scholarship Council ; NSFNational Science Foundation (NSF) [DMR-1157490]
源URL[http://ir.ibcas.ac.cn/handle/2S10CLM1/20475]  
专题植被与环境变化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Univ New Orleans, Pontchartrain Inst Environm Sci, Dept Chem, New Orleans, LA 70148 USA
3.Spencer, Robert G. M.; Kellerman, Anne M.] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
4.Spencer, Robert G. M.; Kellerman, Anne M.] Florida State Univ, Natl High Magnet Field Lab, Geochem Grp, Tallahassee, FL 32306 USA
5.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China
6.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Yinghui,Spencer, Robert G. M.,Podgorski, David C.,et al. Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai-Tibet Plateau: importance of source and permafrost degradation[J]. BIOGEOSCIENCES,2018,15(21):6637-6648.
APA Wang, Yinghui.,Spencer, Robert G. M..,Podgorski, David C..,Kellerman, Anne M..,Rashid, Harunur.,...&Xu, Yunping.(2018).Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai-Tibet Plateau: importance of source and permafrost degradation.BIOGEOSCIENCES,15(21),6637-6648.
MLA Wang, Yinghui,et al."Spatiotemporal transformation of dissolved organic matter along an alpine stream flow path on the Qinghai-Tibet Plateau: importance of source and permafrost degradation".BIOGEOSCIENCES 15.21(2018):6637-6648.

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来源：植物研究所

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