| The soil samples were collected from the vegetable field nearby S107 provincial highway of Xi'an City. The content variation and pollution level of heavy metal in these soil samples were studied by measuring the heavy metal content using the XRF method. The results indicated that: The Cu, Pb, Zn, Cr, Mn, Ni and V were accumulated in these studied soils. The spatial variation analysis of heavy metals in these soils demonstrated that the shelter forest can be effectively limited the diffusion ability and transmission range of Pb and Cr, and prevented the Cu, Zn, Mn, Ni, V and As spreading into the vegetable soils by the large particles pollutants. The assessment results of single pollution index shown that Cu, Pb, Zn, Cr, Mn, Ni and V were in the range of 1.0 to 1.7, total presented light pollution.Among them, the Pb and Cr reached 1.6 and 1.7, was relative heavy pollution. The integrated pollution index of heavy metals in these soil was 1.9 and 1.8, espectively. The pollution level was light. |