Spatial distribution and early warning of heavy metal pollution in Urumqi
乌鲁木齐地区土壤重金属污染空间分布及污染预警研究

The spatial distribution of heavy metals in soil was analyzed with methods of geostatistics and BP based on field investigation and sampling.The situation and environmental risk of heavy metals were subsequently assessed.The results showed that the pollution of Cr was higher in the south and north but lower in the middle part.while the other elements appeared stick-or stripe-shape distribution,decreasing gradually from south to north.The regions with high values of heavy metals were mostly near Urumqi.The contents of heavy metals in Tianshan district,Shayibake district,Xinshiqu district and Shuimogou district were generally higher than other districts of Urumqi.According to predicted content of heavy metals in 2015 and 2020,Cd,with levels higher than the warning value,will cause a severe pollution and should be considered as a priority pollutant.The content of Zn is up to medium warning value,while those of other meals are at highest light warning values.