Research On The Evaluation Of Soil Heavy Metal Pollution Of The Black Soil Region In Jilin Province Based On GIS

With the rapid industrial development, urban pollution and the increase of agricultural chemicals types, the increasing number of soil heavy metal pollution is becoming increasingly serious. Heavy metal pollutants in soil with poor mobility, stranded in a long time and not be microbial degradation, toxic and cumulative effect of strong characteristics of the crop growth, yield and quality have a greater impact, and through the food chain affect human health, soil Once the subject of heavy metal pollution, is to eliminate an extremely easy. Therefore, investigation and evaluation of heavy metals in soil environment pollution and its risk profile, find out the soil quality of the environment, strengthen the comprehensive control of soil pollution, protection of human health is of great practical significance.Eight kinds of heavy metals (Hg, As, Cu, Pb, Zn, Cr, Ni and Cd) in the black soil region (Dehui)in Jilin receive the sampling for survey and test analysis in this paper. With the aid of Global Positioning System, Geographical Information System and evaluation model integration technology of soil heavy metal pollution, following the national soil environmental quality standard and the value of the local soil background for the evaluation criteria, the single pollution index was used to elevate the pollution degree of single element, and comprehensive pollution index was used to implement the general evaluation of soil environmental quality. And then the single evaluation maps and the comprehensive evaluation map was obtained by GIS technology respectively. Studies have shown that the use of geographic information systems black soil area in Jilin Province of heavy metal pollution assessment, the evaluation method is feasible, visual effects and strong. This paper tries to use two standard evaluation to make up for the evaluation of the possible lack of previous studies and this is the difference.Base on the research results, the spatial distribution low of heavy metal content of soil in study region was revealed, providing scientific basis to the governance of heavy metal pollution and the sustainable utilization of the black soil.