【摘要】 为了揭示城市化和工业化等人为活动对土壤环境质量的影响,选择宝鸡市城郊结合部为研究区域,对土壤样品Cu、Zn、Pb、Cd和Cr等5种重金属进行了测定;采用单因子污染指数、综合污染指数法、地积累指数、内梅罗指数和H?kanson潜在生态危害指数对土壤重金属污染状况进行评价,同时运用潜在生态危害指数法分析研究了土壤重金属的潜在生态风险程度。结果表明:研究区域土壤中的5种重金属中除Cd的平均累计含量已超过国家土壤环境质量标准GB 15618—2008中的二级标准外,其他4种重金属元素的平均累计含量均未超过国家二级标准;内梅罗综合评价结果表明,宝鸡城郊农田土壤大多数采样点重金属污染处于尚清洁水平,S3和S5点处轻度污染,S7点中度污染,S6点为重污染;地积累指数评价结果,5种重金属的污染顺序为:Cd≥Cu≥Pb≥Zn≥Cr;5种重金属中Cd是生态风险最大,单个潜在生态危害程度为Cd>Cu≥Pb≥Cr≥Zn;综合潜在生态危害评价显示,在S6和S7处综合为强生态危害,S3、S5和S10处中等生态危害,其余采样点处为轻微生态危害。源解析研究表明,研究区域土壤中的Pb、Cu、Cr和Zn来为同一污染源,而Cd为另外某一污染源。更多还原

【Abstract】 In order to reveal the impact of urbanization and industrialization activities on soil environmentalquality in a region, the research focused on outskirts of Baoji City. The soil samples were collected fromsampling sites, and heavy metal contents were measured. The pollution degree was analyzed and assessed byusing the single pollution index, the composite pollution index, the geoaccumulation index, N.L.Nemerow indexand H?kanson’s potential ecological risk index. The results showed that the average accumulation contents ofall heavy metals except Cd were lower than their environmental quality secondary standard values for soils(GB15618- 1995). The results of N.L.Nemerow index showed that heavy metal contamination of most samplingpoints were at a cleaner level, the sampling points S3 and S5 were slightly polluted, the sampling point S7 hadmoderate level of pollution, and the sampling point S6 had heavy level of pollution. The results of thegeoaccumulation index showed that the pollution order was Cd≥Cu≥Pb≥Zn≥Cr. Ecological risk of Cd was thebiggest among all heavy metals. The individual potential ecological risk of heavy metals ranked in an order as Cd>Cu≥Pb≥Cr≥Zn. The results of the integrated risk assessment showed that the sampling points S6 and S7 had high ecological risks, the sampling points S3, S5 and S10 had moderate ecological risk, while the rest ofthe sampling points were in low risk. Analysis of pollution sources showed that Pb, Cu, Cr and Zn might haveidentical anthropogenic and natural sources, while Cd might have another pollution source in the research area.更多还原