土壤重金属污染的生态风险评估分析:个案研究

研究了浙江富阳某乡土壤重金属污染,并应用概率方法评估了土壤重金属的生态风险。结果表明,研究区土壤中Cu、Zn、Pb、Cd污染严重,平均值分别为290、794、205、2.1mg/kg。生态风险评估表明,土壤重金属Cu、Zn、Pb、Cd对生物种类的风险概率分别为30%、53%、15%和5%,而对生态过程的风险概率分别为44%、70%、13%和0.6%。空间分析表明,研究区有一半以上地区土壤Zn污染对生物种类的影响达75%以上。从保护生态受体来说,对研究区重金属污染的土壤进行修复和风险管理时需要优先针对土壤Zn的污染。

Ecological Risk Assessment of Heavy Metal Polluted Soil:A Case Study

Heavy metal pollution of soil was studied in Fuyang Valley, Zhejiang Province, to carry out ecological risk assessment using probability methodology. The results showed there was serious mixed pollution of Cu, Zn, Pb and Cd in study area. The average concentrations of heavy metals were 290, 794, 205 and 2.1 mg/kg for Cu, Zn, Pb and Cd, respectively. According to the ecological risk assessment of metal polluted soil, the risk probability of Cu, Zn, Pb and Cd were 30%, 53%, 15% and 5%, respectively to terrestrial biota species, and the risk probability of Cu, Zn, Pb and Cd were 44%, 70%, 13% and 0.6%, respectively to terrestrial ecological processes. Spatial analysis indicatesed that more than half of area had high risk probability exceeding 75% to terrestrial biota species due to Zn pollution. Therefore, Zn was identified as the most priority pollutant in term of protection ecological receptor.