基于潜在生态风险指数评价济南市不同城市绿地土壤重金属污染

Based on potential ecological risk index assessment of the heavy metal pollution in different types greenbelts soil of Ji'nan

采用潜在生态风险指数法对济南市公园绿地、居民小区绿地和道路绿化带等3种不同类型15个城市绿地土壤重金属的污染程度进行评价。结果显示,济南市不同类型城市绿地土壤Cd、Hg、Pb、Cu、As和Ni的含量均超过山东省土壤背景值。潜在生态风险评价表明,济南市城市绿地土壤各重金属潜在生态风险程度依次为:Hg>Cd>As>Pb>Cu>Ni,Hg和Cd存在较大潜在生态风险,Hg对济南市城市绿地土壤生态环境潜在风险最大,不同类型城市绿地Hg和Cd潜在生态风险存在差异。济南市城市绿地土壤状况总体处在轻微和中等生态风险,个别绿地土壤处在重度生态风险,不同类型绿地受重金属综合潜在生态风险程度依次为居民小区绿地>道路绿化带>公园绿地。

Assessment of heavy metals pollution of the park greenbelts, the residential greenbelts and the road greenbelts from three different types of 15 greenbelts in Jinan.The results showed that the concentrations of Cd,Hg,Pb,Cu,As and Ni were more than background value of soil in Shandong Province. The potential ecological risk index showed that the potential ecological risk index of heavy metals followed the sequence as Hg> Cd> As> Pb> Cu> Ni,Hg and Cd exist larger ecological risk, the greatest potential threat to the soil ecological environment was Hg, the ecological risk index of Hg and Cd were differences in different types greenbelts.The soil condition of greenbelts in Jinan were in slight and medium ecological risk,but individual greenbelts were severe ecological risk,the potential ecological risk index of different types greenbelts followed the sequence as the residential greenbelts >the road greenbelts >the park greenbelts.