Evaluation of Soil Heavy Metal Pollution in the Western Suburbs of Xi'an Garden

By collecting samples in western suburbs garden of Xi'an,the content of heavy metals in soil was investigated. The content of soil samples of Zn,Pb,Cd and Cr were 138. 79,39. 11,0. 3 and 67. 63 mg / kg. The circumstances of heavy metal pollution were evaluated with single factor index method,Nemerow comprehensive index method and geoaccumulation index method. The results showed that the three soil sampling areas affected to different degrees of pollution: Zn was moderately pollution,Pb,Cd was light pollution to moderately pollution and Cr was pollution to light pollution,pollution levels from high to low is Sanmin Village Beishi bridge Yuhuazhai Village. The content of various forms of heavy metals were determined,through biological effectiveness analysis,it was found that Zn and Pb had high potential threats on plant,Cd had little effect on plant. Cr will cause harm to the plant.