焦作市城区土壤重金属空间变异特征及污染评价
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河南省重点实验室开放基金项目"焦作市土壤重金属有效态空间分布及其影响因素研究"(KF2010-05); 国家自然科学基金项目"煤矿区矸石-土壤-作物系统中重金属生物有效性研究"(41102219)


Spatial Variability and Evaluation of Soil Heavy Metal Pollution in Jiaozuo City
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    摘要:

    为揭示人类活动对土壤环境质量的影响,在河南省焦作市3个城区采集了44个表层土壤样品。利用单因子指数法和内梅罗综合指数法评价了土壤表层重金属的污染程度。并采用地统计学方法对表层土壤样品Cr,Cu,Cd,Pb共4种重金属的空间变异结构和分布格局进行了分析。结果表明,Cr,Cu,Cd,Pb的超标率分别为47.73%,0%,22.73%,0%,土壤Cr,Cd污染较为严重。3个城区Cr和Cd的分布特征总趋势为:山阳区 > 中站区 > 解放区,Pb和Cu的分布特征总趋势为:解放区 > 山阳区 > 中站区。土壤Cr,Cd和Pb之间以及Cu和Pb之间呈显著相关。空间变异结构分析表明,Cd具有极强的变异性,Cr具有较强的变异性,Cu和Pb是中等变异强度。半方差函数模型拟合结果显示Cr具有较强的空间自相关性,Pb具有中等程度的空间自相关性,Cd和Cu具有较弱的空间自相关性。在此基础上,元素Pb呈环状,Cu呈岛状,Cr和Cd呈带状分布。

    Abstract:

    In order to survey the effect of human activities on soil environmental quality, 44 top soil samples were taken in three areas of Jiaozuo City. The single pollution index and the composite pollution index were used to assess the soil heavy metal pollution, and geostatistics method was applied to evaluate the spatial variation structure and distribution of four heavy metals(Cr, Cu, Cd and Pb) in top soils. Results showed that Cr was ranked first and Cd was ranked second in pollution index and overall standard rate, with the overall standard rates being 47.73% and 22.73%, respectively. The concentrations of Cr and Cd were highest in Shanyang District, next in Zhongzhan District, and lowest in Jiefang District. The concentrations of Cu and Pb were highest in Jiefang District, followed by Shanyang District, and lowest in Zhongzhan District. The concentrations of Cr, Cd and Pb were significantly correlated and likewise, Cu and Pb were significantly correlated. The four elements, in order of decreasing spatial variability, were Cd, Cr, Cu and Pb. Results from semivariance analysis showed that Cr had a relatively strong spatial-related variability; Pb, a medium spatial-related variability; and Cd and Cu, a relatively weak spatial-related variability. The distribution of Pb was shown as ring; Cu, as island; and Cr and Cd, as ribbon.

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李艳利,肖春燕,王守全,刘坤朋.焦作市城区土壤重金属空间变异特征及污染评价[J].水土保持通报,2014,(3):271-276

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  • 收稿日期:2013-07-15
  • 最后修改日期:2013-08-29
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  • 在线发布日期: 2016-03-29
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