Spatial Distribution Characteristics and Evaluation Analysis of Heavy Metal Content of Cultivated Soil in Xi'an
Taking the soil of the Kiwi fruit growing area in Zhouzhi and Huyi of Xi'an city as the research object,a convenient heavy metal detector was used to measure the content of heavy metals in the soil,combined with GIS,single factor and Nemero comprehensive evaluation method,the spatial variation and pollution evaluation of heavy metals As,Hg,Cd and Pb in the soil of the study area were analyzed and evaluated.The results showed that:the contents of Cd,Pb,Hg and As in the soils of Zhouzhi County in the act district of Shaanxi Province were above the background values of the soil elements in this region,ranging from 0-0.73 mg/kg,6-56 mg/kg,0-0.25 mg/kg and 0-26 mg/kg respectively.The average values were 0.27 mg/kg,0.07 mg/kg,7.53 mg/kg,29.02 mg/kg,respectively.The variation degree of heavy metals was in the order of Hg＞As＞Cd＞Pb,and the coefficient was between 0.40 and 1.30.The content levels of each sampling site are similar and close,and the degree of dispersion was obviously small.Based on the comprehensive evaluation index grading standard,the single pollution index of the four heavy metals is less than 2,but the comprehensive evaluation standard is larger than 1,which has reached the light pollution level.The single factor of the Nemero comprehensive pollution index of heavy metals Cd,Hg,Pb and As has reached the alert level,and the heavy metals Cd,Hg,Pb and As have had a certain degree of influence on the cultivated soil.
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