Study On System Simulation Of Agricultural Non-point Source Pollution And Management Strategy In Xinlicheng Reservoir Of Jilin Province

In environmental pollution, the research of point source pollution has been already maturer in the domestic and foreign area, and its controlling technology and the managing experience are quite rich. Nowadays, the non-point source pollution is taking more and more attention of researchers around the world because its pollution area is big, pollution is complicated and serious compared to the point source pollution. Studies have shown that non-point source pollution is the major problem of causing surface water pollution, and the most important thing is that fertilizers, pesticides and other organic matter in agricultural process make the largest contribution to non-point source pollution.China has large population, the government has long been in the implementation and advocacy of the policy --"food as the key link"in order to solve the problem of 1.3 billion people. As the"three treasure"of agriculture increase both production and income, pesticides,fertilizers and improved varieties are performing important roles in the process of solving the problem of grain.However, pesticides and fertilizers brought many environment pollution problems as the same time of helping agricultural income. Many of our lakes, rivers appear ecology pollution disaster such as blue-green algae and red tide because we overused organic substances like fertilizers for a long time. As our agricultural non-point source pollution research got off to a late start, it has many long-standing problems. So it is particularly important that reducing and controlling of pollution and studying the way be suited to China agricultural non-point pollution with its managing measure.Jilin province, as China's important commodity grain base, is more and more dependent on large inputs of fertilizers and pesticides in recent years as the farmers wants to maximize their economic benefits with the continents improvement on grain price and production. Over fertilization and pesticide residues has already become the major killer of environmental pollution. At the same time, global warming trends are becoming more and more evident, Jilin Province where located in north-easten area have clear phenomenon in the past few years of rainfall decrease and temperature increase and so on.As Xinlicheng reservoir is the important water supply source of Changchun City which short of water, how to protect existing surface water reservoir, ensure domestic water safety and satisfy the needs of agricultural manufacturing water are the important subject of current research, especially the agricultural non-point pollution, furthermore it has far-reaching practical significance to water pollution of Xinlicheng reservoir especially agricultural non-point pollution's systemic research.This paper take Changchun Xinlicheng reservoir as the object of study, investigate the natural resources, climate characteristics and social attributes as well as agricultural production of this area, and conducted a study of the following points through large amounts of data reading, data acquisition with the combination of non-point source pollution software AnnAGNPS and the support of geographical information technique GIS.1. To set up Xinlicheng reservoir area basin agricultural non-point pollution model's related input parameters through data count analyses and documentation arrange including digit elevation chart establishment, Xinlicheng reservoir basin soil parameter collection using 1:250,000 soil information chart from the soil department of Jilin Province, digital soil utilization chart production with the help of Xinlicheng reservoir area soil utilization from Jinlin Province soil project office. To ensure the value K the corrosive factor of fertilizers, pesticides and soil and value R the corrosive factor of rainfall and to get climate tax bureau's dayclim.inp document through the past climate data's unite input and edit.2. To get this research area basin total nitrogen, the total phosphorus and silt total output through establishing and operation of Xinlicheng reservoir basin agricultural non-point pollution AnnAGNPS model. This practice study period is from Jan. 2008 to Dec. 2008, during the time, total nitrogen output is 75.24 tons, total phosphorus output is 355.75 tons and the silt total output is 47596.32 tons. Months from May to Sep in a year are the major pollution load time, above 85% of the year total output.3. The adoption of agricultural non-point source model of the reservoir area Xinlicheng basin modeling, the study area on agricultural non-point source pollution in the region, which make the region suitable for agricultural non-point source pollution management strategy. This article is based on watershed management, through the vigorous promotion and popularization of agricultural non-point source pollution of knowledge, focused on pollution in the regional construction of non-point source pollution model, as well as the construction of terraced fields in line with local conditions, isolation buffer strips, straw and other agricultural food technology to the comprehensive management of Xinlicheng reservoir non-point source pollution problems.