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4 CONCLUSIONS
Overall, low contamination levels of As, Cu, Cr, Zn,
Ni were observed in the study area, while Pb and Cd
were present at considerable contamination levels.
However, based on natural background values of
study area, all PTEs had an accumulation trend in
soils. Spatial anisotropy of the seven PTEs was
significant, with the principal direction of variation of
As, Pb, Cd, Cr, and Ni being E–W and that of Zn and
Cu being NW–SE. Spatial anisotropy of As, Pb, Cd,
Cr and Ni were in accordance with the spatial
distribution of soil type and pH value. Higher pH
values and rocks on the mountain could prevent
vertical migration of PTEs. Lower pH value in the flat
regions could increase transportation of PTEs. Spatial
distribution of Zn and Cu may result from lateral
transportation by soil erosion.
ACKNOWLEDGEMENTS
This work was supported by Beijing Postdoctoral
Research Foundation, and the postdoctoral program
set up by Beijing Key Laboratory of Remediation of
Industrial Pollution Sites, Environmental Protection
Research Institute of Light Industry, Beijing, China,
Uncertainty Analysis and Cause Analysis of Spatial
Distribution of Soil Pollution.
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