The Characteristics of Spatial Distribution of Hg Content in the Farm Lands in Midong District of Urumqi City

Geographical information system(GIS)combined with Geostatistics was applied to determine the spatial distribution of heavy metal Hg contents in the farmlands from Midong of urumqi.The results showed that: The soil Hg content was in the range of 0.05~0.28 mg/kg,and the average content of soil Hg was 0.11 mg/kg,and it is below the GradeⅡstandard of the National Environmental Quality Standard of two for Soil(GB15618-1995);and it is two times of Urumqi city agricultural farmland soil background values.Soil Hg has better spatial variance structure,which conformed with the spherical model.The range of soil Hg was smaller(0.205 km),the base coefficient was 50%,belong to moderate spatial autocorrelation which showed that spatial variation in the study area were affected by the impact both of structural factors(soil parent material,topography,and so on) and by random factors(such as irrigation,fertilization and tillage practices).The Hg content in soil in the study area was low in the middle part and high in both sides.