The Research On Spatial Distribution Characteristics And Ecological Risk Assessment Of Heavy Metals Of Industrial And Mining Wasteland In Y Country

“All things grows in the soil.” As an important natural resource in human production and life,soil is the material basis for survival and development of mankind.China is a developing country in the stage of rapid development,the demand for natural resources is huge,especially the demand for the mineral resources which plays an important role in the social and economic development,therefore,China's urban mining industry is growing rapidly.Due to the previous extensive production,and the lack of environmental awareness and the lack of management,Leading to the "three industrial wastes" seriously polluted the soil around mining,smelting and transportation,some long-term untreated metal mine tailings soil heavy metal pollution seriously,which will seriously threaten the quality of agricultural quality and human health.Therefore,we should establish the dynamic monitoring system of soil environmental quality of mining wasteland as soon as possible,and actively carry out the evaluation of soil heavy metal pollution to guide the restoration of heavy metal pollution,and enhance the soil environmental quality of mining wasteland.Based on this,this paper selected a industrial and mining wasteland in Y country,southwest China as the Research area,carries on heavy metal sampling and detection analysis to the soil and crops in the research area,combined with soil heavy metal pollution assessment and potential ecological risk assessment methods,evaluates the soil environmental quality after reclamation,and uses kriging interpolation method to visualize the evaluation results.The results show that: 1)using the kriging interpolation method in Arcgis to determine the distribution characteristics and extent of heavy metal pollution,the spatial information of soil pollution can be visualized,and the uncertainty of the soil can be further quantified,which will improve the accuracy of assessment of regional soil heavy metal pollution;2)due to the history of the region by the impact of natural smelting,the study soil acidification is serious,there is a certain degree of soil heavy metal pollution,but the overall level of pollution is not high,and the pollution mainly concentrated in Sulphur residue area and low altitude area;3)soil pollution in the study area mainly is multiple heavy metal compound pollution,the main elements are Cd?Cr and Hg;4)soil heavy metal pollution was correlated with soil physical and chemical properties.5)the study area should take appropriate comprehensive measures of covering soil,tillage,passivation and biological measures to control soil heavy metal pollution according to different pollution levels,control the risk of heavy metal pollution,protect crop growth safety and human health in the region.The study can provide a reference for dynamic monitoring of soil heavy metal pollution in industrial and mining wasteland,the objective evaluation of the extent and extent of heavy metal pollution,and effective control of heavy metal pollution in soil.