The Agricultural Non-point Source Pollution In Xinjiang:an Economic Analysis And Policy Studies

At present,agricultural development in Xinjiang is facing the problem of agricultural non-point source pollution,which restricts the sustainable development of agriculture.The non-point source pollution of chemical fertilizer input is one of the main kinds of agricultural non-point source pollution in Xinjiang.With the continuous investment of chemical fertilizer,the problem of non-point source pollution caused by chemical fertilizer input is becoming more and more serious and has aroused great concern of the government and academic circles.Taking the agricultural chemical fertilizer pollution in Xinjiang as the research object,this paper studies the general situation of the pollution in Xinjiang,the relationship between the agricultural economic growth and the pollution and the control policy of the pollution in Xinjiang at present.At first,a quantitative study on agricultural chemical fertilizer pollution in Xinjiang was carried out.It is found that the intensity of chemical fertilizer application in Xinjiang is far beyond the standard of safe fertilization in recent years,and the application of nitrogen fertilizer and phosphorus fertilizer is the main factor.The non-point source pollution caused by chemical fertilizer input was quantitatively measured by setting the loss of total nitrogen and total phosphorus.The results showed that the loss of total nitrogen and total phosphorus of chemical fertilizer input in Xinjiang increased year by year.Then the EKC model is used to test the relationship between agricultural economic growth and the pollution.The results show that the relationship between the pollution and agricultural economic growth in Xinjiang conforms to the inverted U-shaped curve.And the current level of agricultural economic development in Xinjiang has not yet reached the inflection point.Then,by constructing the Tapio decoupling model between agricultural economic growth and the pollution,the paper analyzes the decoupling between agricultural economic growth and total nitrogen pollution,total phosphorus pollution and total nitrogen and phosphorus pollution in Xinjiang.It is found that the overall agricultural economic growth in Xinjiang has not yet been strongly decoupled from the pollution,and the growth of agricultural economy is still at the expense of the environment.Although Xinjiang has achieved weak decoupling in general and some areas,the amount of chemical fertilizer pollution is still increasing,but its growth rate is slightly lower than the growth rate of agricultural economy.It is also found that reducing the total amount of fertilizer and optimizing the fertilizer structure are two ways to achieve strong decoupling.Finally,on the basis of the above research,this paper studies the control policy of the pollution in Xinjiang from four aspects: policy content,implementation effect,existing problems and improvement space.It is found that the policy has four problems,such as neglecting the application of market-oriented methods,lacking long-term mechanism of preventing and controlling the pollution,imperfect ecological compensation mechanism,and unclear subject of responsibility for policy implementation.Based on this,the paper puts forward some policy suggestions,such as levying sewage discharge fee,establishing long-term mechanism of preventing and controlling the pollution,establishing ecological compensation mechanism of preventing and controlling the pollution,and carrying out the system of field-leader to prevent and control the pollution,and so on.