Research of spatial variability of heavy metal pollution of dust in Shanghai urban area based on the GIS
基于GIS的上海城市灰尘重金属空间分布特征研究

Based on the Geostatistical module of ArcGIS, heavy metal contents and their characteristics of spatial distributions were studied from the street dust and park dust in Shanghai urban area. Average contents of heavy metal are high. Values of Pb,Cr,Cu,Ni,Zn are 273.45,144.01,190.01,86.26,708.25 mg·kg-1 which are 10.7,1.9,6.6,2.7,8.2 times of the soil background values respectively. The urban dusts were polluted by Pb, Zn, Ni which were much higher in the industrial estate, sowntown and busy roads. The spatial correlations of Pb and Cu are low, which indicates that they were controlled by anthropic activities, whereas those of Zn, Cr, Ni and organic matter belong to the moderate class, which shows that they were produced by both random factor and structural factor. The method based on the geostatistical module in ArcGIS can exactly reflect the character of spatial variability of heavy metals.