3种不同功能区绿地土壤Cd和Hg的污染现状及其风险评价  

The Pollution Status and Risk Assessments of Cd and Hg in Green-belts Soils from Three Different Functional Areas

作　　者：梁晶[1] 马光军[2] 赵晓艺[1] 方海兰[1] 

机构地区：[1]上海市园林科学研究所,上海200232 [2]南京农业大学资源与环境科学学院

出　　处：《现代农业科技》2009年第12期17-19,共3页Modern Agricultural Science and Technology

基　　金：上海市建委重大攻关项目(2008-006)

摘　　要：在调查研究工业区、交通区和公园绿地土壤重金属Cd和Hg含量的基础上,对其污染程度进行了评价,结果表明:重金属Cd在工业区和交通区绿地土壤中的平均含量接近,均约为国家环境质量背景标准值的2倍,但在公园绿地土壤中没有明显的积累现象;与Cd不同的是重金属Hg在3种不同功能区中均有明显的积累现象,尤其是公园土壤中重金属Hg的含量为国家背景值的4倍。采用单项污染指数评价法对2种重金属的污染程度进行评价表明,工业区、交通区、公园绿地土壤中Hg的重度污染分别占28%、25%和50%,Cd的重度污染则分别占30.0%、37.5%和0%。通过种子发芽指数评价法进行评价得知,重金属对植物造成影响有一临界值,其含量只有超过该临界值才能对植物造成毒害,小于其临界值时对植物的影响不明显,但关于该临界值的确定还有待进一步研究。Based on the contents of Cd and Hg of the green-belts soils from industrial districts, traffic areas and parks, the green-belts soils were evaluated for heavy metal pollution. The results showed that the average contents of Cd in the green-belts soils from industrial districts and traffic areas were similar, which were twice more than its background values. However,no significant Cd accumulation occured in green-belts soils from the parks. And, compared with Cd, the significant pollution of Hg occurred in green-brits soils from the three different functional areas. Especially, the average contents of Hg were four times more than its background values in parks. Single factor pollution index of Cd and Hg were then utilized to evaluate soil pollution,the results indicated 28% soil samples from industrial districts,25% from traffic areas and 50% from parks were seriously contaminated by Hg. While for Cd,the ratio of heavily polluted soil samples was 30.0% ,37.5% and zero, respectively. The results of seed germination index also indicated that the impact of heavy metals on plants had a critical value,and the heavy metal contents only exceeded its critical value, the posioning would be caused, otherwise, the impacts were not obvious. However, the determination the critical values need to be further studied.

关 键 词：工业区 交通区 公园 绿地土壤 CD HG 污染 

分 类 号：X53[环境科学与工程—环境工程]