The Three Gorges Reservoir Area (Chongqing Section) Spatial Differentiation Of Non-point Source Pollution In Rural Areas

Agricultural non-point source pollution, has been highly valued in developedcountries; in China, the Taihu, Dianchi water pollution is serious, also began to payattention to the agricultural non-point source pollution. In2003, the completion of theThree Gorges Project and water power generation, with the reservoir water levelpromotion, agricultural non-point source pollution problems have become increasinglyprominent, which pose a grave threat to the water environment of the Three GorgesReservoir area. At present, the Three Gorges reservoir water quality is the continueddeterioration of the risk. Therefore, to explore the influence of Three Gorges Reservoirarea water quality of agricultural non-point source pollution have become increasinglyprominent problem, research of its control technology and so on have been crunch time.In view of this, this article in the Three Gorges Reservoir Area (Chongqing section) inregion of rural non-point source pollution spatial aspects of research, provide technicalsupport for the later development of the Three Gorges Reservoir area of agriculturalnon-point source pollution prevention and control work.The main content of this paper is the Three Gorges Reservoir Area (Chongqingsection) of data from4aspects of chemical fertilizer, livestock farming, rural domesticsewage and rural living garbage collection of pollutant emissions in rural areas, willpollutant factor data one by one into ARCGIS system, generate the Three GorgesReservoir Area (Chongqing section) rural non-point source pollution database,according to the specific calculation formula of non-point source pollution index ofeach characterization of rural, calculation and processing using ARCGIS data analysisfunction, research to show different regional pollution load scenario and sources inspace, differentiation and fully reflect the different regional agriculture non-point sourcepollution. And the Three Gorges Reservoir area for COD emissions, COD emissions,biological pollution discharge amount, total nitrogen emissions and pollution totalammonia emissions of5pollutants factors of these pollutants (Chongqing section) analysis of specific space, finally draws the research conclusion and puts forward thecorresponding countermeasures.In order to study the effect of the Three Gorges Reservoir Area (Chongqing section)difference of non-point source pollution in rural areas of space, the regionalcharacteristics of rural non-point source pollution in the Three Gorges Reservoir area ofthe summary, according to the Three Gorges Reservoir Area (Chongqing section)differences in rural economic development, aquaculture development, impact of thedam or radiation range and the possible formation of pollution sources, the ThreeGorges Reservoir Area (Chongqing section) in the district is divided into six regionalbasic unit (the tail of the reservoir, reservoir tail the urban core area urban peripheralarea, the reservoir tail low mountain and hilly areas, library parallel ridge and valleyarea, the hinterland along the hilly region and the hinterland of the peripheral mountainarea). The Three Gorges Reservoir area chemical pollutant emissions, pollutantdischarge amount of livestock and poultry farming, rural domestic wastewater pollutantemissions and rural living garbage pollutant emissions pollution sources in4aspects ofthe show in the six regions of space, results show that:(1) The Three Gorges Reservoir Area (Chongqing section) rural non-point sourcepollution has typical characteristics of spatial distribution.(2) Three Gorges Reservoir area of rural library tail the urban core area ofnon-point source pollution is slight, the surface runoff concentration of pollution is themain source of pollution.(3) Three Gorges Reservoir area of rural library tail outer metropolitan areanon-point source pollution is light, for aquaculture production stable region, agricultureand livestock farming is a major source of pollution.(4) The rural non-point source pollution of surrounding mountain area in ThreeGorges Reservoir area is relatively heavy, effects of pollution farming and soil erosionarea, agriculture, livestock, sewage and garbage is a major source of pollution.(5) The Three Gorges Reservoir Area Rural hilly area of reservoir tail surfacesource pollution is serious, is a farming and soil erosion pollution composite region,agriculture and livestock farming is a major source of pollution.(6) In rural areas in Three Gorges Reservoir area parallel ridge and valley areanon-point source pollution is very serious, is a kind of pollution producing active regionfarming and soil erosion, agriculture and livestock farming is the main source ofpollution and relatively active. (7) The Three Gorges Reservoir Area along the hilly areas of rural non-pointsource pollution is the most serious pollution, is a frequent planting area and the soilerosion, agricultural activities, sewage and garbage is a major source of pollution.