Research On The Evaluation System Of The Uralcological Environment In Dujiangyan

Rural environmental protection occupies an extremely important strategic position in the process of the ecological civilization construction. At present, Dujiangyan is in the accelerated developing period of industrialization, urbanization and modernization, the development still suffers from a serious lack of balance, co-ordination and sustainability, especially in the rural development.Dujiangyan is a national ecological agricultural protection zone, the development of non-agricultural industry is constrained sometimes, but the current industrial development still relies on machinery manufacturing, printing package, and food processing, and the pollution is serious,,environmental governance in Dujiangy is facing great pressure with the sustained growth of the rural population.Based on the theory of ecology, by using the GIS technology and remote sensing technology, combined with the administrative boundaries of related regions, land use map, and the distribution of pollution sources, which is divided Dujiangyan into three levels according to "city overall-ecological environment control unit -key sensitive factors". Through the rural ecological environment monitoring and investigation, district the evaluation area, construct the evaluation system, and analyze the status of the ecological environment in rural areas of Dujiangyan. Finally, it is concluded that we have the priority order in 26 key assessment indicators of each control unit and the whole rural ecological environment in Dujiangyan and the following four major environmental problems:1.The rural non-point source pollution problems, including livestock manure comprehensive utilization rate is not high, pollution control facilities are not perfect, the built of livestock and poultry pollution treatment facilities are not up to the corresponding processing requirements.2.The overuse of chemical fertilizer, up to 295.5 kg/ha., especially in Dujiangyan City, the main agricultural area of production-piedmont plain area, planting non-point source pollution is more serious;3.Soil erosion seriously. Especially the Longchi-Hongkou and Wenchuan border area, as well as Qingchengshan, Zipingpu and Guankou area, soil erosion is very sensitive, prone to soil erosion, causing ecological damage. Especially by "5.12" earthquake, the north and west of the regional part of landslides, rock mass looseness, the soil and water conservation facilitiesseverely damaged, resulting in a large amount of soil erosion;4. Geological disasters. Especially in Hongkou, Longchi, Guankou, Xiange and Pu Yang is very sensitive to the regional geological disaster prone to geological disasters, floods, mudslides,landslides, causing great damage to the ecological environment.The results of the assessment can be for environmental management decision-makingoptimization decision making, in order to focus investment in environmental protection funds,priority to carry out comprehensive improvement of ecological environment in some key areas,sensitive areas.