【摘要】 采用单因子污染指数、污染负荷指数和潜在生态风险指数对伊宁市主城区表层土壤的53个样品中Pb、Cu、Zn、Mn、Ni、Cr、Hg 7种金属元素的含量和污染特征进行评价。结果表明:(1)伊宁市主城区表层土壤重金属Pb、Cu、Zn、Ni、Cr、Hg的含量是其新疆土壤背景值的1. 17、3. 24、0. 9、2. 2、1. 33、0. 68、0. 66倍,除个别重金属外各重金属之间存在不同程度的显著相关性;(2)单因子污染指数结果表明Pb为重度污染,Hg为中度污染,Ni和Cu属于轻度污染,Zn、Cr、Mn没有被污染;土壤重金属的污染负荷指数PLI平均值为1. 20,属于轻度污染;(3)Hg存在较强的生态风险,其余6种重金属都存在轻微程度的生态风险,综合潜在生态风险指数均值为139. 15,属于中等生态风险,Hg是伊宁市地表土壤潜在生态风险主要的影响因子。更多还原

【Abstract】 The content and pollution characteristics of Pb,Cu,Zn,Mn,Ni,Cr and Hg in 53 samples of Yining main urban area were evaluated by single factor pollution index,pollution load index and potential ecological risk index. The results showed that:(1) The contents of Pb,Cu,Zn,Ni,Cr,and Hg in the soil of Yining City were 1. 17,3. 24,0. 9,2. 2,1. 33,0. 68,and 0. 66 times higher than the soil background values in Xinjiang;there was a significant correlation among the heavy metals except some heavy metals. There were significant correlations among different levels of heavy metals in addition to few heavy metals.(2) Results of single factor pollution index show that Pb was heavily polluted. Hg was moderately polluted,Ni and Cu were mildly polluted,and Zn,Cr,and Mn were pollution-free. The average PLI of the pollution load index was 1. 20,which was light pollution; the average Merowuo index was 3. 08,indicating heavy pollution.(3) Hg had strong ecological risk,and the remaining 6 heavy metals had slight ecological risk. The average value of the comprehensive potential ecological risk index was 139. 15,which was a moderate ecological risk. Hg was the main impact factor of the potential ecological risk of surface soil in Yining City.更多还原