北京市农业土壤重金属污染环境风险等级评价  

Risk grade assessment for farmland pollution of heavy metals in Beijing

作　　者：姜菲菲[1] 孙丹峰[1] 李红[2] 周连第[2] 

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]北京市农林科学院综合发展研究所,北京100097

出　　处：《农业工程学报》2011年第8期330-337,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金："十五"国家科技攻关计划(2004BA617B04);国家科技支撑项目(2006BAD10A06-03;2006BAB15B05)

摘　　要：为全面了解北京市农业土壤中重金属污染环境风险等级及空间分布特征,采用Hakanson潜在生态危害指数法对1018个采样点的Cr、Ni、Cu、Zn、As、Cd、Pb、Hg8种重金属进行污染的潜在生态风险评价,并运用指示克里格方法绘制污染风险概率分布图,对整个北京市农业土壤重金属污染风险的空间分布特征进行分析。结果表明:北京市农业土壤重金属污染风险已达到中度和低度,低度、中度、重度和严重4个风险等级的样点比例分别为42.63%、34.97%、18.57%、3.83%,8种金属中Cd和Hg元素污染风险最高,Cr、Ni、Zn元素生态风险较低,风险概率图显示城区周围、大兴、通州、密云等地风险等级较高。In order to fully investigate the environmental pollution risks of Heavy Metals and its spatial distribution in Beijing cultivated soils,environmental risk of Cr, Ni, Cu, Zn, As, Cd, Pb and Hg in 1018 soil samples were evaluated using Hakanson potential ecological risk index, and the probability distribution maps of their risk were produced by indicator Kriging method, also their spatial distribution were analyzed. The results showed that the heavy metals’ environmental risk of Beijing reached medium level and low level, and the respective samples ratio of low, moderate, severe and very serious risk level was 42.63%, 34.97%, 18.57% and 3.83%. The risks of Cd and Hg were at a higher level, the risks of Cr, Ni, and Zn were relatively slight. Risk probability map indicates that the urban fringe around the city, Daxing, Tongzhou, and Miyun are in the high-risk areas.

关 键 词：土壤污染 重金属 风险评价 Hakanson指数 指示克里格 

分 类 号：X825[环境科学与工程—环境工程]