Effects of Land Use on Heavy Metal Accumulation in Soils and Sources Analysis

Heavy metal accumulation and its influential factors were studied in the different land use soils,which would provide a theoretical basis for controlling the content of heavy metals in soils.To identify the effects of land use on the accumulation of heavy metals in soils,148 soil samples were collected from four land use patterns including greenhouse field,uncovered vegetable field,maize field,and forest field in Siping area of Jilin Province,China,and Cr,Ni,Cu,As,Cd,Pb,and Zn contents of those samples were determined with ICP and ICP-Mass.The result showed that there was a rather large difference in effects of the accumulation of Cr,Ni,Cu,As,Cd,and Zn in soils under different land use patterns,except Pb.Based on the assessment which compared with background concentrations in soil,the higher accumulation of heavy metals was found in greenhouse and uncovered vegetable field,much less in maize field and forest field.The mean contents of heavy metals in soils from high to low were arranged in order of greenhouse field,uncovered vegetable field,maize field,and forest field.Cd and Cu had relatively serious accumulation in soils compared to Cr,Ni,As,and Zn.The mean content of Cd in greenhouse field was 0.467 mg kg-1 which exceeded the grade Ⅱ of the Chinese Soil Quality Criterion GB 15618-1995(6.5