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Evolution of the Dissolved Organic Matter Composition along the Upper Mekong (Lancang) River

文献类型：期刊论文

作者Liu, Ting; Wang, Xin3; Zhu, Erxiong3; Liu, Zongguang3; Zhang, Xinying3; Guo, Jingjing; Liu, Xiaoqing3; He, Chen2; Hou, Shengjie4; Fu, Pingqing5
刊名ACS EARTH AND SPACE CHEMISTRY
出版日期2021
卷号5期号:2页码:319-330
ISSN号2472-3452
关键词dissolved organic matter the Mekong River cascade reservoirs FTICR-MS lignin phenols
DOI10.1021/acsearthspacechem.0c00292
文献子类Article
英文摘要The Mekong River is the tenth largest river in the world in terms of water discharge, representing a substantial source of organic matter to the South China Sea. However, the composition and variation of dissolved organic matter (DOM) remain poorly studied in this international river flowing through contrasting climates and severely affected by cascade reservoirs. Herein, using biomarkers, optical spectroscopy, and ultrahigh-resolution mass spectrometry analyses, we present a benchmark investigation of DOM evolution in the upper Mekong (Lancang) River. We show that terrestrial plant-derived DOM accumulates in the wet season but degrades downstream in the dry season in the upper natural reach of Lancang. In contrast, terrestrial DOM decreases consistently in both wet and dry seasons along the lower reach affected by reservoirs, accompanied by decreases (instead of increases) in lignin oxidation indices (i.e., acid-to-aldehyde ratios) and high-oxygen highly unsaturated compounds. While photo- and microbial oxidation is considered to partly contribute to terrestrial DOM removal, we employ a series of batch sorption experiments to further show that sorption to fine-sized mineral particles may explain the decreasing lignin acid-to-aldehyde ratios in DOM. Given the high abundance of fine-sized suspended particles and long residence time in the Lancang reservoirs, removal via sorption (and possibly flocculation) is a potential important pathway for terrestrial DOM in the Lancang River. Cascade reservoirs hence are a hot spot of DOM processing, and an in situ quantitative assessment of sorptive removal of DOM therein warrants closer attention.
学科主题Chemistry, Multidisciplinary ; Geochemistry & Geophysics
出版地WASHINGTON
WOS关键词MICROBIAL-DEGRADATION ; MANWAN RESERVOIR ; LIGNIN PHENOLS ; PLANT-TISSUES ; CARBON ; MASS ; DOM ; REACTIVITY ; TRANSPORT ; OXIDATION
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
语种英语
出版者AMER CHEMICAL SOC
WOS记录号WOS:000621420200015
资助机构Chinese National Key De v e l opme n t Pr o g ram f o r Ba s i c R es e a r c h [2019YFA0607303] ; National Natural Science Foundation of China [41973075, 41603076, 31988102] ; Chinese Academy of Sciences Interdisciplinary Innovation Team [JCTD-2018-06]
源URL[http://ir.ibcas.ac.cn/handle/2S10CLM1/26424]  
专题植被与环境变化国家重点实验室
作者单位1.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
4.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
5.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Ting,Wang, Xin,Zhu, Erxiong,et al. Evolution of the Dissolved Organic Matter Composition along the Upper Mekong (Lancang) River[J]. ACS EARTH AND SPACE CHEMISTRY,2021,5(2):319-330.
APA Liu, Ting.,Wang, Xin.,Zhu, Erxiong.,Liu, Zongguang.,Zhang, Xinying.,...&Feng, Xiaojuan.(2021).Evolution of the Dissolved Organic Matter Composition along the Upper Mekong (Lancang) River.ACS EARTH AND SPACE CHEMISTRY,5(2),319-330.
MLA Liu, Ting,et al."Evolution of the Dissolved Organic Matter Composition along the Upper Mekong (Lancang) River".ACS EARTH AND SPACE CHEMISTRY 5.2(2021):319-330.

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来源：植物研究所

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