Study On The Characteristics Of Agricultural Non-point Source Pollution In Henan Province

Agricultural non-point source pollution is a complex process of intermittent,random,sudden,uncertainty is very strong,it has complex sources of diversity,widespread distribution,location and methods of uncertainty and great harmfulness characteristics.At the present,the agricultural non-point source pollution has been more than industry and urban life.The source of pollution has become an important source of water pollution in rural areas in china.Henan province has a high degree of agriculture and agricultural economy is developing rapidly.Therefore,it is of great significance for the estimation of agricultural non-point source pollution load in Henan Province,the analysis of spatial and temporal distribution characteristics,and the comprehensive evaluation.The agricultural non-point source pollution load in Henan province was estimated by using the output coefficient method,and the spatial and temporal characteristics were analyzed:First,time characteristic:（First）From 2006 to 2013,the total loads of TN,COD_Cr decreased significantly,TN load decreased from 603 thousand and 200 t to 471 thousand t,the total load of COD_Cr decreased from 1 million 82 thousand and 900 t to 861 thousand and 400 t,the total load of TP in a steady decrease,reduced from 86 thousand and 500 t to 69 thousand and 700 t.In general,the total load of TN,TP and COD_Crr in agricultural non-point source pollution in Henan province was gradually reduced.（Second）The average load intensity of TN,TP and COD_Cr decreased year by year,and the load intensity of TN,TP and COD_Cr showed a trend of decreasing first and then increasing.（Third）During the period from 2006 to 2013,the agricultural land and the rural life produced by TN,TP,COD_Cr changed little,the total load,load intensity showed less trend from livestock and poultry;TN,TP,COD_Cr changes greatly,but the overall trend showed less load,strength with load change.Second,spatial distribution:（First）The TN,TP,COD_Cr load and load intensity of all cities are decreasing,and the spatial distribution of TN,TP and COD_Cr in the city is not significant.（Second）Henan Province agricultural non-point source pollution of TN,TP and COD_Crr load in the past 8 years has been concentrated in Nanyang City,Zhumadian City,Zhoukou City,Shangqiu city and Zhumadian city;Pingdingshan city is always TN,TP,COD_Cr load the highest intensity of the city,is the focus of the city governance pollution non-point.In this paper,the method of equal standard pollution load and equal standard pollution load index was used to analyze the agricultural non-point source pollution in Henan Province in2013:First,Different equivalent load produced 18 cities than are different,but have similar rules:TN and TP equicaloric pollution loading ratio is far greater than COD_Cr,TN and TP are the main pollutants;pollutants produced 18 different source pollution,the equicaloric pollution loading ratio display with the pollution sources of pollution contribution vary greatly,with livestock pollution than agricultural land and rural life,livestock is a major source of pollution.Second,Kaifeng City is the highest standard of pollution index in 2013,followed by Hebi,Xuchang,Puyang,much higher than the provincial average of 44.56,the lowest are Xinyang,Sanmenxia;agricultural land,livestock and rural domestic pollution source 3 average pollution standard pollution index were 11.38,22.07,11.11.Agricultural land,livestock and rural life and standard pollution index of Kaifeng city with the highest.