北京土壤重金属分布及评价——以五环以内为例

文章选择北京市五环内土壤为研究对象,对不同环、不同功能区等空间位置变化下的土壤进行了采样和分析,研究了北京市城市土壤重金属Pb、Cu、Cr、Cd的空间分布特征,以期为北京市环境保护和治理以及城市环境规划提供理论依据。研究结果表明,北京市五环以内地区土壤中Cu、Cr、Cd含量均超过背景值。在空间分布上,土壤中4种重金属的含量呈现出由内向外递减的趋势,而公园外重金属含量超过公园内,车流量大、堵车严重地区土壤重金属含量也较高。综合污染评价表明,北京市五环以内地区土壤重金属属于轻度污染,Cr、Cu、Pb属于清洁级,Cd已接近中度污染。

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.