Research Of Agricultural Pollution Stress Based On The Pollution Footprint Model In Chongqing

Chongqing is a typical urban-rural dual structure of the municipality directlyunder the central government. Country area is large and the agricultural population ismore. In recent years，along with the social economy rapid development andpopulation growth，result in agricultural product supply pressure. Excessive chemicalfertilizers of planting and poultry breeding industry developed，the loss of fertilizerand livestock and breeding industry emissions of pollutants lead to the waterenvironmental quality showed a trend of deterioration in Chongqing. In conclusion，this paper quantitative analysis the agriculture quantity of pollutants into the river tothe impact of water environment in Chongqing, and to evaluate its.The paper explorethe way of reducing agricultural pollution for water environment protection inChongqing provide scientific basis for decision, and provide the ideas to protect thesafety water of the Three Gorges Reservoir.Comprehensive consideration of crop farming，livestock and poultry breedingand aquaculture pollution influence on water environment. First，calculate the quantityof agricultural pollutant (COD，TN and TP) into the river in Chongqing，analysisagricultural pollutants space difference. Secondly，introducing the pollution footprintmodel，calculation of agricultural pollutant chemical oxygen demand (COD)，totalnitrogen (TN) pollution footprint，and analysis of pollution footprint space differenceat the same time. In the end，build the pressure model of agricultural pollution，calculation of agricultural pollution pressure index， quantitative assessmentagricultural pollutants to water environmental impact degree in Chongqing. Theconclusion is as follows：(1) The amount of agricultural organic pollutant COD is87882.712tons on thewater environment，it mostly come from livestock and poultry breeding，in Chongqing.in space，the county’s agricultural organic pollutant COD is low in the Southeast areaand Northeast area of Chongqing，urban development new area is high. The amountof agricultural pollutant total nitrogen (TN) is27972tons on the water environment，it mostly come from planting and livestock and poultry breeding. in space，thecounty’s agricultural pollutant TN is low in the urban function areas and Southeastarea of Chongqing，urban development new area is high. The amount of agricultural pollutant total phosphorus (TP) is3409.252tons on the water environment，it mostlycome from planting and livestock and poultry breeding，the county’s amount ofagricultural pollutant total phosphorus (TP) is low in urban development new area andSoutheast area of Chongqing，the county’s amount is higher in Northeast area ofChongqing.(2) In Chongqing，the amount agricultural pollution footprint of organic CODwas129620hm2，it mainly from livestock and poultry breeding industry，aquacultureis less. On the space，the county’s agricultural pollution footprint is low in theSoutheast area of Chongqing. Rongchang’s agricultural pollution footprint of COD ishighest in Chongqing. The amount agricultural pollution footprint of total nitrogen(TN) was563948hm2，it mainly from planting and livestock and poultry breeding，aquaculture minimum. The county’s agricultural pollution footprint is higher of totalnitrogen (TN) in urban development new area，Urban function areas is low.(3) Chongqing’s per capita agricultural pollution footprint of COD is0.025hm2，but district difference is obvious. The county agricultural pollution footprint of CODis low in urban development new area and Southeast of Chongqing area，but urbanfunctional areas and Northeast area of Chongqing county is higher. Per capitaagricultural pollution footprint of TN is0.107hm2，large difference of each districtand county. The amount of Agriculture ten thousand yuan output value of CODpollution footprint is0.0041hm2，significant difference in each district and county.The amount of Agriculture ten thousand yuan output value of TN pollution footprintis0.0178hm2. In space，the county’s ten thousand yuan output value is low of TNpollution footprint in urban development new area，is higher in Northeast area andSoutheast area of Chongqing.(4) The amount of pollution footprint is563945hm2of agricultural inChongqing，it was2.57times that of water area in Chongqing. The amount ofpollution carrying capacity is219638hm2，leaving344307hm2as pollution deficit.Deficit polluted county are mainly distributed in the urban development new area.The agricultural pollution pressure index is2.568，moderate and severe pollutioncounty are mainly distributed in the urban development new area.In order to reduce the organic pollutants of agricultural in Chongqing，weshould take measures about how to deal with the livestock and poultry breeding.livestock and poultry breeding industry wastes. In order to reduce the nitrogenpollutants，we should take measures about how to deal with the crop farming，for example，fertilizer reasonably，improve the absorption utilization rate of crops onnitrogen，established buffer area and development of ecological agriculture，reducethe amount of agricultural pollution into the river.