Spatial and temporal comparisons of dissolved organic matter in river systems of the Three Gorges Reservoir region using fluorescence and UV-Visible spectroscopy

doi:10.1016/j.envres.2020.109925

	Spatial and temporal comparisons of dissolved organic matter in river systems of the Three Gorges Reservoir region using fluorescence and UV-Visible spectroscopy
	Ma, Yongmei; Li, Siyue
刊名	ENVIRONMENTAL RESEARCH
	2020-10-01
卷号	189 页码:9
关键词	Dissolved organic matter (DOM) Fluorescence Optical properties Seasonal variation Land use
ISSN号	0013-9351
DOI	10.1016/j.envres.2020.109925
通讯作者	Li, Siyue(syli2006@163.com)
英文摘要	Understanding optical characteristics, composition and source of dissolved organic matter (DOM) in rivers of the Three Gorges Reservoir (TGR) region is important for region and global carbon cycle. However, chemical compositions and source of DOM from the tributary to mainstream in the TGR region are not well studied. Consequently, 126 water samples were collected from rivers in different land use region, and these rivers covered the main tributaries of the Yangtze River in the TGR region. The temporal and spatial variations of DOM structure and source identification in different land use region were investigated using UV-visible absorbance and fluorescence spectroscopy. Overall, there were higher ratio of humic acid to fulvic, aromaticity, molecular weight and proportion of colored humic substances in DOM in the wet season than in the dry season. The weaker biologic/microbial and stronger terrestrial sources in DOM were observed in the wet season than in the dry season. DOM comparison in variable land use demonstrated the higher terrestrial sources and weaker biologic/microbial sources in DOM in the forest-affected rivers irrespective of hydrological seasonality, as well as in the wet season irrespective of land use types. DOM in the farmland-affected rivers showed more protein-like signal. We found that monsoonal precipitation, anthropogenic activities and land use were important drivers for the DOM quality variations. These findings will be beneficial to unravel riverine DOM structure and sources in relation to anthropogenic activities and also improve our understanding of DOM biogeochemical cycle in the rivers.
资助项目	National Natural Science Foundation of China[NSFC 31670473] ; National Natural Science Foundation of China[21806164] ; Youth Innovation Promotion Association of CAS[2020378]
WOS研究方向	Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
WOS记录号	WOS:000576645400002
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/11871]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Li, Siyue
作者单位	Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China
推荐引用方式 GB/T 7714	Ma, Yongmei,Li, Siyue. Spatial and temporal comparisons of dissolved organic matter in river systems of the Three Gorges Reservoir region using fluorescence and UV-Visible spectroscopy[J]. ENVIRONMENTAL RESEARCH,2020,189:9.
APA	Ma, Yongmei,&Li, Siyue.(2020).Spatial and temporal comparisons of dissolved organic matter in river systems of the Three Gorges Reservoir region using fluorescence and UV-Visible spectroscopy.ENVIRONMENTAL RESEARCH,189,9.
MLA	Ma, Yongmei,et al."Spatial and temporal comparisons of dissolved organic matter in river systems of the Three Gorges Reservoir region using fluorescence and UV-Visible spectroscopy".ENVIRONMENTAL RESEARCH 189(2020):9.