title: [Spatial distribution and pollution source identification of agricultural non-point source pollution in Fujiang watershed].
abstract: In order to provide regulatory support for management and control of non-point source (NPS) pollution in Fujiang watershed, agricultural NPS pollution is simulated, spatial distribution characteristics of NPS pollution are analyzed, and the primary pollution sources are also identified, by export coefficient model (ECM) and geographic information system (GIS). Agricultural NPS total nitrogen (TN) loading was of research area was 9.11 x 10(4) t in 2010, and the average loading was intensity was 3.10 t x km(-2). Agricultural NPS TN loading mainly distributed over dry lands, Mianyang city and gentle slope areas; high loading intensity areas were dry lands, Deyang city and gentle slope areas. Agricultural land use, of which contribution rate was 62. 12%, was the most important pollution source; fertilizer loss in dry lands, of which contribution rate was 50.49%, was the prominent. Improving methods of agricultural cultivation, implementing "farm land returning to woodland" policy, and enhancing treatment efficiency of domestic sewage and livestock waster wate are effective measures.
authors: Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, Resources and Environmental Research Academy, North China Electric Power University, Beijing 102206, China. binger2000dxw@163.com
authors: Xiao-Wen
authors: XW
authors: Ding
authors: Zhen-Yao
authors: ZY
authors: Shen
mesh_terms: D002681:China; D018556:Crops, Agricultural / Q000254:growth & development*; D004784:Environmental Monitoring; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D045483:Rivers; D012989:Soil Pollutants / Q000032:analysis; D062206:Spatial Analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution / Q000517:prevention & control
chemical_list: D005308:Fertilizers; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen