Jinghui Canal Irrigation Area Eco-environmental Quality Analysis And Evaluation

Irrigation area has been playing a crucial role in the economic development of China, especially in grain production. However, there are a series problems happened during the production and construction of irrigation area in the recent years. This study is on the basis of the investigation of agricultural activities and environmental current situation in Jinghui-Irrigation area by collecting water and soil samples, to analyzes the environmental impact cause by pesticide, the chemical fertilizer and other agricultural activities, meanwhile, selects the appropriate evaluation model according to the characteristics of the Jinghui-Irrigation, and evaluates synthetically the quality of the ecological, and proposes the corresponding measures and suggestions, provides a scientific basis for the reasonable and healthy development of the agricultural production . The conclusions are following:(1) The survey of the use of capital goods showed that pesticide application per hectare in the Jinghui-Irrigation area is four times than Shaanxi Province, fertilizer application outgrows the security line of the developed countries at 0.56 times, in the 0.2 times of multiple cropping index. The ratio imbalance is caused by the excessive use nitrogen fertilizer, and the ratio of nitrogen: phosphorus: potassium is 1:0.204:0.148.(2) In the Jinghui-Irrigation area, the groundwater survey showed that the groundwater is rich in salt content, exceeded the class IV of the groundwater standards, the long-term use of groundwater irrigation make soil salinization.(3) Evaluate eco-environmental quality of the Jinghui-Irrigated area by level analysis and principal component analysis. Carry out the conclusion that the key factor influence the quality of soil fertility of the irrigation area is organic matter, followed by the phosphorus and potassium; the first factor that impact the quality of the groundwater irrigation area is salt, followed by COD; the main factor that impact the soil environmental quality are Hg and Cr, because the large increase rate of Zn in the soil, ranked No. 3.(4) Application comprehensive evaluation index system of the eco-environment quality to evaluate Jinghui-Irrigation area, it show that the Irrigation area is in average level, mainly because the pesticides and fertilizers be used heavily, and vegetation cover scare.(5) In view of the agricultural production of the Jinghui-Irrigation area, propose the large-scale cultivation, develop comprehensive agriculture of cooperating scientific fertilization with irrigation. Enlarge the vegetation coverage, according to local conditions, develop forestry in which groundwater is rich but poor quality that can not be irrigated, strengthen the local ecological stability.