Analysis On Present Situation Of Farmland Water Pollution In Jianghan Plain And Research On Comprehensive Land Improvement

China is rich in natural resources,with a population of 1.4 billion.Per capita natural resources are relatively small compared with other countries,and fresh water and land resources are relatively scarce.In recent decades,the rapid development of industry and the demand of agricultural development have led to serious water pollution problems,the lifeblood of farmland in water,farmland ecological environment problems are facing great challenges.This study focuses on the investigation and analysis of the current situation of farmland water pollution.According to relevant national standards,spectrophotometric method is mainly used to detect the quality of farmland water and its surrounding agricultural water,and the single factor index method and nemero index method are comprehensively used to evaluate the agricultural water quality.The single factor index method was used to evaluate the water quality indexes.The research results showed that the pH index of farmland water was 0.75,meeting the standard value,the TN index was 1.370,exceeding the standard value,and the TP index was 0.415,meeting the standard value.In the ditch water,the pH index is 0.70,conforming to the standard value,the TN index is 1.180,exceeding the standard value,and the TP index is 0.693,conforming to the standard value.In the aquaculture water,the pH index is 1.46,exceeding the standard value,the TN index is 0.940,meeting the standard value,and the TP index is 4.700,seriously exceeding the standard value.The results show that farmland water body,ditch water body and aqueduct water body are polluted to different degrees,the pollution degree of aqueduct water body is greater than that of farmland water body,and the pollution of farmland and ditch water body is nitrogen pollution,and the pollution of aqueduct water body is phosphorus pollution.In order to protect the farmland ecological safety,and the surrounding agricultural environment,this paper studied area around the farmland water pollution status quo,agricultural environment present situation and the present situation of land use and industry development needs,analysis of the current problems we are facing is:in the study area water environment comprehensive prevention and control system is weak,non-point source pollution aggravate,destroyed the farmland ecosystem,road landscape and functional difference,village lack of reasonable planning,etc.In view of the above problems,a comprehensive land improvement scheme is proposed to comprehensively treat the research area,and the agricultural water environment is improved by constructing constructed wetlands,ecological purification ponds,ecological ditch corridors,improving farmland soil environment,building a good farmland ecosystem,and integrating residential concentrated treatment of domestic sewage.The research results of this paper can provide a basis for the treatment of agricultural water pollution,non-point source pollution and the restoration and protection of farmland ecosystem in the study area,and can provide a reference for the treatment of farmland water pollution in jianghan plain.