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| Evolution of the Dissolved Organic Matter Composition along the Upper Mekong (Lancang) River | |
Liu, Ting; Wang, Xin1; Zhu, Erxiong1; Liu, Zongguang1; Zhang, Xinying1; Guo, Jingjing; Liu, Xiaoqing1; He, Chen2; Hou, Shengjie3; Fu, Pingqing4; Shi, Quan2; Feng, Xiaojuan1
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| 2021 | |
| 发表期刊 | ACS EARTH AND SPACE CHEMISTRY
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| ISSN | 2472-3452 |
| 卷号 | 5期号:2页码:319-330 |
| 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. |
| 关键词 | dissolved organic matter the Mekong River cascade reservoirs FTICR-MS lignin phenols |
| 学科领域 | Chemistry, Multidisciplinary ; Geochemistry & Geophysics |
| DOI | 10.1021/acsearthspacechem.0c00292 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 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) |
| WOS记录号 | WOS:000621420200015 |
| 出版者 | AMER CHEMICAL SOC |
| 文献子类 | Article |
| 出版地 | WASHINGTON |
| 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] |
| 作者邮箱 | xfeng@ibcas.ac.cn |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | 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.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China 4.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 5.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, 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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| Evolution_of_the_Dis（2726KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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