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Riverine dissolved organic matter (DOM) as affected by urbanization gradient

文献类型：期刊论文

作者Zhang, Liuqing1,2; Xu, Y. Jun3,4; Li, Siyue5,6
刊名ENVIRONMENTAL RESEARCH
出版日期2022-09-01
卷号212页码:9
关键词Urban intensities Seasonal variation Dissolved organic matter (DOM) Chromophoric dissolved organic matter (CDOM) Three Gorges Reservoir Area
ISSN号0013-9351
DOI10.1016/j.envres.2022.113457
通讯作者Li, Siyue(syli2006@163.com)
英文摘要Rapid urbanization has considerably altered carbon biogeochemical cycle and river hydrology. However, the influences of urban land use and urban-induced nutrient increase on dissolved organic matter (DOM) characteristics are poorly understood. Here we hypothesize that the alterations significantly change sources and levels of DOM in river systems that drain the urban areas. To test the hypothesis, we investigated DOM in headwater rivers with varied urban intensities in the Three Gorges Reservoir Area (TGRA), China, through field sampling conducted in the dry and wet seasons. We found positive relationships of urban land (%Urban) with DOC concentration and chromophoric DOM (CDOM) absorption coefficients a254, a280 and a350, as well as fluorescence index (FI370), indicating the significantly increased levels of DOM and autochthonous sources along an urbanization gradient. A stepwise regression analysis demonstrated that occurrences of DOC and CDOM can be predicted by %Urban, while increasing autochthonous source is predictable by the increase in riverine nitrogen. Moreover, a254, a280 and FI370 values showed distinct seasonal variations, with significantly higher CDOM concentration in the wet season and with much higher autochthonous signal in the dry season with high nitrogen loading. Based on the findings, we conclude that urbanization influences occurrences and sources of DOM, with increasing urbanization making an important and direct contribution to DOM, and an indirect effect of urban induced nutrient enrichment, i.e., enhanced nutrient loadings increase autochthonous DOM production in rivers.
资助项目National Natural Science Foundation of China[31670473] ; U.S. Department of Agriculture Hatch Fund project[LAB94459]
WOS研究方向Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
语种英语
WOS记录号WOS:000808318400005
出版者ACADEMIC PRESS INC ELSEVIER SCIENCE
源URL[http://119.78.100.138/handle/2HOD01W0/16193]  
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1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
2.Univ Chinese Acad Sci, Chongqing Sch, Chongqing 400714, Peoples R China
3.Louisiana State Univ Agr Ctr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA
4.Louisiana State Univ, Coastal Studies Inst, Baton Rouge, LA 70803 USA
5.Inst Changjiang Water Environm & Ecol Secur, Wuhan Inst Technol, Engn Res Ctr Phosphorus Resources Dev & Utilizat, Sch Environm Ecol & Biol Engn,Key Lab Green Chem P, Wuhan 430205, Peoples R China
6.Wuhan Inst Technol, Res Ctr Environm Ecol & Engn, Sch Environm Ecol & Biol Engn, 206 Guanggu 1st Rd, Wuhan 430205, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Liuqing,Xu, Y. Jun,Li, Siyue. Riverine dissolved organic matter (DOM) as affected by urbanization gradient[J]. ENVIRONMENTAL RESEARCH,2022,212:9.
APA Zhang, Liuqing,Xu, Y. Jun,&Li, Siyue.(2022).Riverine dissolved organic matter (DOM) as affected by urbanization gradient.ENVIRONMENTAL RESEARCH,212,9.
MLA Zhang, Liuqing,et al."Riverine dissolved organic matter (DOM) as affected by urbanization gradient".ENVIRONMENTAL RESEARCH 212(2022):9.

入库方式： OAI收割

来源：重庆绿色智能技术研究院

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