title: Modeling increased riverine nitrogen export: Source tracking and integrated watershed-coast management.
abstract: The global NEWS model was calibrated and then used to quantify the long term trend of dissolved inorganic nitrogen (DIN) export from two tributaries of Jiulong River (SE China). Anthropogenic N inputs contributed 61-92% of river DIN yield which increased from 337 in 1980s to 1662 kg N km(-2) yr(-1) in 2000s for the North River, and from 653 to 3097 kg N km(-2) yr(-1) for the West River. North River and West River contributed 55% and 45% respectively of DIN loading to the estuary. Rapid development and poor management driven by national policies were responsible for increasing riverine N export. Scenario analysis and source tracking suggest that reductions of anthropogenic N inputs of at least 30% in the North River (emphasis on fertilizer and manure) and 50% in the West River (emphasis on fertilizer) could significantly improve water quality and mitigate eutrophication in both river and coastal waters.
authors.affiliation: State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Yu
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Weijin
authors.initials: W
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China. Electronic address: nwchen@xmu.edu.cn.
authors.forename: Nengwang
authors.initials: N
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
authors.forename: Benrong
authors.initials: B
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
authors.forename: Huasheng
authors.initials: H
authors.lastname: Hong
authors.affiliation: Fujian Provincial Academy of Environmental Science, Fuzhou 350003, China.
authors.forename: Guihua
authors.initials: G
authors.lastname: Zhuo
mesh_terms: D002681:China; D003247:Conservation of Natural Resources / Q000379:methods; D004784:Environmental Monitoring; D063366:Estuaries; D005068:Eutrophication; D005308:Fertilizers; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis*; D045483:Rivers; D012722:Sewage; D014876:Water Pollution / Q000032:analysis / Q000517:prevention & control; D060753:Water Quality
chemical_list: D005308:Fertilizers; D012722:Sewage; D009584:Nitrogen
keywords: Coastal management; Dissolved inorganic nitrogen; Eutrophication; Jiulong River