Beijing City Soil Heavy Metal Distribution and Evaluation: Take Inner 5th Ring Road Area for an Example

This article selects Beijing soil as the research object,sampled and analyzed different ring and different functional areas of space position changes of soil.Research the spatial distribution character of Pb,Cu,Cr,Cd of urban soil heavy metals in Beijing,in order to provide a theoretical basis for the Beijing environmental protection and governance,and urban environmental planning.The results show that the soil heavy metals Cu,Cr and Cd in Beijing are more than background values except Pb.On the spatial distribution,the content of the four soil heavy metals in Beijing showing a decreasing trend from the inside out.The content out of the park is more than in the park.The place where the traffic is heavy also has a higher content.Comprehensive evaluation of the heavy metal indicates that Beijing area belongs to mild soil heavy metal pollution,Cr,Cu,Pb belong to clean level,and Cd Already close to moderate pollution.