Spatial VariationAnalysis of Soil Heavy Metal in Xinhe Reclaimed Water Irrigation District of Beijing
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Abstract:
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.
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