Regionalization Method And Its Application Of Non-Point Source Pollution Control

Agricultural non-point source pollution control regionalization is a new area of research to rural environmental protection. With the point source pollution control capability, non-point source pollution, especially agricultural non-point source pollution problem gradually appearing. Serious water pollution in China, watershed, farmland, livestock and poultry breeding, aquaculture, and urban-rural life is the main reason for causing nitrogen and phosphorus eutrophication, its contribution rate much higher than domestic sewage from urban point source pollution and industrial point source pollution. Due to soil, topography, climate, hydrology, land use and management and many other factors, agricultural non-point source pollution, there is a clear regional and unbalanced, spatial differences in pollution load very significant. Thus, in the formulation of agricultural non-point source pollution control planning, not necessarily in the implementation of a comprehensive governance throughout the region, if the first identified within the region pollution and high load areas, and give priority to strengthening the management, you can greatly reduce the pollution control efforts more difficult, and better governance to achieve the desired goal. For this reason, this paper, county-level administrative regions as the basic unit of agricultural non-point source pollution to carry out a comprehensive quantitative evaluation of pollution control regionalization study, based on the results of regionalization of agricultural non-point source pollution management at different levels and classification of control, can improve the effectiveness of pollution control, for agricultural non-point source pollution controls to provide theoretical guidance, promotion macro-management of rural environmental protection.In this paper, the theoretical analysis and case study research method of combining, in a comprehensive analysis of domestic and international agricultural non-point source pollution and regionalization on the basis of research, described to carry out agricultural non-point source pollution control regionalization of the importance and current research profile, defined the agricultural non-point source pollution control division of the content, nature and location, defined the agricultural non-point source pollution control regionalization of the theoretical basis and principles, proposed agricultural non-point source pollution control regionalization methodology, the end, Jiangsu Province as an example of the research and analysis. Through theoretical analysis and case studies show that:(1) Agricultural non-point source pollution control regionalization is defined as the natural and socio-economic conditions of the region accounting for out of agricultural non-point source pollution emissions and carry out the sensitivity of agricultural non-point source pollution assessment, a clear agricultural non-point source pollution on the type and direction of pollution control will be divided into different areas of agricultural non-point source pollution control area process. Agricultural non-point source pollution control regionalization is the integrated sector-zoning is to conduct agricultural non-point source pollution control, a basic work of.(2) In a clear agricultural non-point source pollution control regionalization research tasks and content, proposed the methodology of the agricultural non-point source pollution control regionalization. Agricultural non-point source pollution control regionalization methodology include the following aspects:①Agricultural non-point source pollutant emission inventory analysis;②Agricultural non-point source pollution sensitivity evaluation;③Agricultural non-point source pollution classification;④Agricultural non-point source pollution control division and its overview. The regionalization methodology through the list of the basic unit of analysis of quantitative accounting of agricultural non-point source pollutants (COD, TN, TP) emissions and regional differentiation rules and conduct of agricultural non-point source pollution sensitivity evaluation and agricultural non-point source pollution classification, then, the first-class regionalization carried out based on agricultural non-point source pollution sensitivity evaluation, the second-class regionalization carried out based on the type of pollution, after a comprehensive analysis and adjustment of the final result to be regionalization. This method is mainly achieved by quantitative analysis, supplemented by qualitative analysis, to achieve a "bottom-up" and "top-down" means a combination of regionalization. (3) In the agricultural non-point source pollution control division among methodology, quantitative accounting of agricultural non-point source pollution is the development of agricultural non-point source pollution control division key, and to quantitative accounting of agricultural non-point source pollution, the key is to determine the parameters of all sources of pollution. On agricultural non-point source pollution of the field investigation, model simulations and literature review, to obtain a quantitative accounting of Jiangsu Province, agricultural non-point source pollutants in all the parameters needed.(4) In this paper, Jiangsu Province as an example of the case study to achieve the basic theory and principles of regionalization guiding role and adopt proposed regionalization method has been successfully carried out, Jiangsu Province, agricultural non-point source pollution control regionalization.①Agricultural non-point source pollutants (COD, TN, TP) of the quantitative accounting that Jiangsu Province, agricultural non-point source pollution from agricultural production is mainly produced by the process. From the perspective of major pollutants, COD, TN, TP equal standard pollution loading, such as the ratio of 6.81,56.50,36.69%, respectively, can be seen, Jiangsu Province, the main agricultural non-point source pollutants is TN and TP.②Jiangsu Province, the sensitivity of agricultural non-point source pollution is divided into three levels, which Pukou Etc 33 counties (cities, districts) for agricultural non-point source pollution light sensitive areas, Luhe Etc 25 counties (cities, districts) for the agricultural non-point source pollution moderately sensitive areas, Gaochun County, Hai’an County, Haimen City, Rudong City, Tong Zhou City, Xinghua City, total 6 counties (cities) for agricultural non-point source pollution highly sensitive areas.③Jiangsu Province, the type of agricultural non-point source pollution can be divided into fertilizer and aquaculture polluting (I), aquaculture polluting (II), fertilizers polluting (III), fertilizer and livestock polluting (IV), combined polluting (V).④According to the result of agricultural non-point source pollution sensitivity analysis and pollution types, Jiangsu Province, in accordance with the principle of partition and partition methods, combining top-down and bottom-up will be divided into three the first order pollution control areas (pollution sensitivity) and thirteen the second order pollution control areas (pollution types, pollution control direction). Thus, according to the results of the first-class regionalization can be achieved agricultural non-point source pollution control management at different levels, according to the results of the second-class regionalization can be achieved agricultural non-point source pollution control management at different classification.