京北城区公路绿化带土壤重金属污染

为了解北京市公路绿化带土壤的环境质量,对北部城区环线公路附近不同植被类型土壤重金属的含量和污染指数进行了分析。研究表明:土壤Zn和Pb在不同公路绿化带中的分布极不均匀,变异系数分别达到了108.79%和99.56%。北二环路公路带土壤Pb、Cu、Zn、Ni、Mn、Co的含量均显著高于北五环区域土壤的重金属含量,而北四环和北五环各土壤重金属含量无显著差异。不同土壤重金属种类的污染程度不同,土壤中的Pb处于清洁水平,Cr和Cu处于轻度污染水平,Zn和Co处于中度污染水平,而Ni和Mn处于警戒限水平。综合来看,土壤重金属的综合污染指数为1.81,土壤环境质量达到了轻度污染的程度。

Soil Heavy Metal Pollution of Roadside Greenbelt in the North of Beijing

In order to gain an understanding of the soil environmental quality of roadside greenbelt,the concentrations and pollution indexes of soil heavy metals under different vegetation types near the ring roads were studied in North Beijing.The results showed that the concentrations of Zn and Pb in different roadside greenbelt soil were distributed unevenly,the coefficient of variation were 108.79% and 99.56%,respectively.The concentrations of soil Pb,Cu,Zn,Ni,Mn,Co in the North Second Ring Road were significantl...