上海市外环高速公路4个绿地土壤重金属含量及污染状况  

Heavy metal concentration and contamination in four green lands along the Outer Ring Road in Shanghai

作　　者：岳军妹 刘群录 孙文[4,5] 李欣 金政[1,5] 彭志[4,5] YUE Jun-mei;LIU Qun-lu,;SUN Wen;LI Xin;JIN Zheng;PENG Zhi(School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 200240,China;Fengxian DistrictGreening Administration,Shanghai 201400,China;School of Design,Shanghai Jiaotong University,Shanghai 200240,China;Shanghai Urban Forest Research Station,State Forestry Administration,Shanghai 200240,China;Shanghai Forest Station,Shanghai 200072,China)

机构地区：[1]上海交通大学农业与生物学院,上海200240 [2]奉贤区绿化管理署,上海201400 [3]上海交通大学设计学院,上海200240 [4]国家林业局上海城市森林生态系统国家定位观测研究站,上海200240 [5]上海市林业总站,上海200072

出　　处：《上海交通大学学报（农业科学版）》2018年第5期7-13,共7页Journal of Shanghai Jiaotong University(Agricultural Science)

基　　金：上海市绿化和市容管理局科学技术项目(G141208)

摘　　要：为了研究上海市外环绿地土壤重金属的污染现状,本文选择莘庄立交桥、S20-蕰川路、五洲大道-赵高路和迎宾路-唐黄路4个绿地,分别取0～5、5～20和20～50cm 3个土层的土壤样品,利用电感耦合等离子体发射光谱仪(ICP)测定了土壤中Cd、Cr、Cu、Pb、Zn 5种重金属的浓度,并利用单因子污染指数、内梅罗指数、潜在生态危害指数对样地土壤重金属污染状况进行分析。结果表明,土壤中Cd的含量最低,平均为2.43mg/kg,然而Cd造成的污染最为严重,所有样点的Cd含量均超过了三级标准,并具有极强的潜在生态风险。各土层的Cd污染指数均达到了中等污染水平,其中五洲大道-赵高路样地20～50cm土层达到了严重污染的水平。土壤中Cr含量最高,平均值达277.69mg/kg,超标率为18.52%,在五洲大道-赵高路样地的0～5和5～20cm土层中造成轻微污染。土壤中Cu、Pb和Zn均未超标,处于清洁水平。4个样地中五洲大道-赵高路和S20-蕰川路样地的内梅罗指数分别为2.22和2.03,总体上具有中等程度的污染;而迎宾路-唐黄路和莘庄立交桥2个样地均处于轻度污染水平。然而分析各样地的重金属综合潜在生态危害指数,发现这4个样地均存在着较强的潜在生态风险。To investigate heavy metal contamination in the green lands beside the outer ring highroad in Shanghai,the concentrations of Cd,Cr,Cu,Pb and Zn in soil in 0-5,5-20 and 20-50 cm layers of four large green lands at the Xinzhuang overpass,S20-Wenchuan road,Wuzhou road-Zhaogao road and Yingbin roadTanghuang road were determined by ICP.The heavy metals contamination situations of the green lands were evaluated with single factor pollution index,Nemerow index and potential ecological risk index.Theresults indicated that the concentration of Cd was the lowest among the 5 metals,the average was 2.43 mg/kg.However,Cd caused the most serious pollution.The Cd concentrations of all soil samples exceeded the soil quality standard III,and had very high potential ecological risk.Cd pollution indexes of all soil layers reached middle level.Moreover,Cd in the 20-50 cm soil layer of Wuzhou road-Zhaogao road green land was at serious pollution level.Cr concentration in soil was the highest：the average was 277.69 mg/kg,its overstandard ratio was 18.52%.Cr in 0-5 and 5-20 cm soil layers of Wuzhou road-Zhaogao road green land had slight pollution.Concentrations of Cu,Pb and Zn in soil did not exceed the standards.And the three metals were at clean level.The Nemerow indexes of Wuzhou road-Zhaogao road and S20-Wenchuan road green lands were 2.22 and 2.03,respectively,which meant that both of the two green lands had middle level pollution.While,Yingbin road-Tanghuang road and Xinzhuang overpass green lands had slight pollution.However,all the four green lands had considerable potential ecological risks by analyzing the comprehensive potential ecological risk indexes.

关 键 词：绿地 土壤 重金属污染 生态风险 

分 类 号：S731.2[农业科学—林学]