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为了揭示土壤重金属含量与其影响因素间的作用关系,为土壤重金属的污染控制和治理提供参考,该研究以北京市耕作土壤重金属元素为例,采用传统线性回归模型和空间自回归模型分析和比较了土壤重金属含量及其影响因素间的相关关系。结果表明:Cr、Ni、Zn、Hg空间自回归模型的拟合度较传统线性回归模型好,并且残差的空间自相关性消失。因此,空间自回归模型能够很好地解释重金属含量与其影响因素间的相关关系。结果表明:Cr、Ni含量的影响因素主要为土壤母质和土地利用强度,Zn、Hg含量的主要影响因素为道路、工矿企业和土壤母质。
In order to reveal the interaction between soil heavy metal content and its influencing factors, this paper provides a reference for the control and treatment of heavy metal pollution in soil. Taking heavy metal elements in cultivated soils in Beijing as an example, this study uses traditional linear regression model and spatial autoregressive model to analyze and compare Correlation between soil heavy metal content and its influencing factors. The results show that the spatial autocorrelation models of Cr, Ni, Zn and Hg have a better fitting degree than the traditional linear regression model, and the spatial autocorrelation of the residuals disappears. Therefore, the spatial autoregressive model can well explain the correlation between heavy metal content and its influencing factors. The results show that the main influencing factors of Cr and Ni contents are soil parent material and land use intensity. The main influencing factors of Zn and Hg content are roads, industrial and mining enterprises and soil parent materials.