不同城市绿地土壤重金属污染特征及其季节分异  

Seasonal Pollution Characteristics of Heavy Metals in Different Green Space

作　　者：刘坤[1] 杨杉[1] 汪军[1] 李洪刚 张晟[1] 程敏 邹家素 

机构地区：[1]重庆市环境科学研究院,重庆401147 [2]重庆市生态环境监测中心,重庆401147

出　　处：《环境影响评价》2018年第1期73-77,共5页Environmental Impact Assessment

基　　金：重庆市基本科研业务费项目(2016-hky-jcyj-01705);重庆市渝北区科技计划项目合同(2017(农社)15)

摘　　要：为明确不同城市绿地土壤重金属污染的季节变化特征,本文选取重庆市主城区公园绿地、住宅绿地、道路绿地三种典型绿地利用类型,测定了绿地土壤中Pb、Cd、Zn、Ni、Cu、Cr、As和Hg八种重金属的含量,利用单因子污染指数法和内梅罗综合污染指数法分析了绿地土壤重金属污染的季节性特征。研究结果表明:不同季节城市绿地土壤重金属含量差异性显著,两季均表现为Hg、Cd的平均含量超过重庆市土壤背景值,且存在一定程度的累积。同一季节不同类型城市绿地土壤中重金属含量的差异较大,住宅区绿地中As的含量以及道路绿地的Cu、Zn含量在两季均表现为最高。Cd是研究区域绿地土壤中主要的重金属污染物,其单因子污染指数最高,应加以防范。土壤污染综合指数表明,夏季以公园绿地重金属的PN最大,冬季以住宅区绿地重金属的PN最大。In this paper, three kinds of green space of Chongqing （park green space, residential green space and road green space） were taken as research subjects. The concentrations of soil heavy metals （Pb, Cd, Zn; Ni, Cu, Cr, As and Hg） were measured, and their seasonal pollution levels were evaluated by single pollution index and Nemerow complex pollution indices. The resuhs showed that the average content of Hg and Cd exceeded the background values of Chongqing. In addition, human activities were the main pollution source for the green space. Pollution characteristics of heavy metals in different kinds of green space in summer or winter were quite different, and As in residential green space in the study area and Cu, Zn in road green space had the highest concentration. Cd was the heaviest pollution in three types of green space, which belonged to slight risk level. The results of Nemerow complex pollution indices showed that the park green space in summer and the residential green space in winter had the highest indices, respectively.

关 键 词：城市绿地 重金属 污染评价 季节变化 

分 类 号：X825[环境科学与工程—环境工程]