为了研究再生水灌溉对土壤重金属含量的影响，为再生水的环境影响效应评价提供参考，在北京市通州区新河灌区30个采样点进行了分层土壤采样，分别测定了各层土壤样本中7种重金属元素（Cu、As、Ni、Cr、Pb、Zn、Cd）的含量。以2006年的当地实测土壤背景值为对照标准，利用地统计分析方法，对重金属元素土壤剖面上的分布特征进行了分析，特别对Ni元素的空间变异性及样点元素间的相关性做了较详细的土壤分层研究。结果显示，通州新河灌区Cd、Zn、Cu的变异较为明显，变异系数在0.20～0.51之间，其变异程度由大到小依次为Cd>Zn>Cu；Ni元素在一定程度上存在空间相关性，相关距为24 km，在四个取样土层中的变程都很大，表明Ni在较大空间范围内的分布表现出一致性。

In order to investigate the impact of reclaimed water irrigation on the content of soil heavy metals and to provide reference for the environmental impact evaluation of reclaimed water, soil samples were collected at a total of 30 sampling points in the Xinhe Irrigation District of Tongzhou County in Beijing and the contents of Cu, As, Ni, Cr, Pb, Zn, and Cd were determined. The local soil characteristics in 2006 were regarded as the background values. Geostatistical analysis method was used to analyze the spatial distribution characteristics of heave metals in soil profile, especially the spatial variation and correlation among samples of Ni element were investigated in detail. The results showed that the spatial variations of Cd, Zn, and Cu were obvious in the Xinhe Irrigation District of Tongzhou with the spatial variation coefficient between 0.20 and 0.51. The order of variation degree was Cd> Zn> Cu. Ni element showed the spatial correlation to some extent and the spatial correlation distance was 24 km. The variations of Ni in four soil sampling layers were apparent, indicating the consistency of spatial distribution of Ni in a large scale.

中央高校基本科研业务费专项资金项目(2009SD-10)；国家自然科学基金项目（41371043）