Evaluation And Safety Use Of Heavy Metal Pollution In Agricultural Land

Heavy metal pollution seriously affecting the quality of agricultural land,agricultural land over the issue of heavy metals has been to jeopardize the safety of crops and food safety.Taking A city as the study area,with heavy metals such as cadmium,lead,copper exceeded agricultural land as the research object,using the method of GIS spatial analysis,mainly to study the cadmium,lead and copper exceeded agricultural land safe use of evaluation methods and by land type conversion reach safe use of agricultural land and layout optimization target relevant programs,has made the following findings:(1)Using the inverse distance weighting method for cadmium,lead,and copper contents were interpolation,analysis of heavy metals in the three spatial distribution of A City,found that most of the study area at a low heavy metal content of the state,cadmium,lead,copper pollution belong to the local nature.(2)According to the "Agiricultual Land Soil Environment Quality Standard","Edible Agricultural Production and Environmental Quality Evaluation Criteria" to determine the different pH values,heavy metals differently under the category of pollution of agricultural land safe use of evaluation criteria;use single index evaluation method,at the different sites type of agricultural land in cadmium,lead and copper content of heavy metals in each case were excessive use of safety evaluation division level of security,and a single species of heavy metals in the safe use of evaluation results are combined to give the three heavy metals safe use of a combination of the type of evaluation,analysis of pollution combined with the spatial distribution.Depending on the ground under the same class of pH on the safe use of the same standard of heavy metals,the present study points to the case discussed the possibility of type conversion mode and feasibility.(3)Excessive heavy metals in the study area proposed for conversion of agricultural land for the main types of land layout optimization measures,and optimized layout were the safe use of evaluation.The results showed that the conversion can greatly reduce the level of contamination,effectively reducing the people's life and production exceeded the harm agricultural land,while achieving savings of limited agricultural land use and rational allocation.The proposed scheme to maximize reduce agricultural land relative pollution degree and area,to help to us through the most economical and feasible way to realize the safety of heavy metal pollution of agricultural land use,for the safety of heavy metal pollution in China,agricultural land use management and governance technology selection provides the basis.