The migration,transformation and ecological effects of heavy metals in soil-cropsystem in Lipu,Guangxi
In order to understand the content and distribution characteristics of heavy metals in soil and crops in Lipu,soil and crops(rice,Lipu taro,citrus,water chestnut)were collected.Todetermine the pH value of soil samples and the total amount of As,Cd,Cr,Hg,Ni,Pb,Cu,Zn and the form content of As,Cd,Cr,Hg,and Pb.The content of As,Cd,Cr,Hg,Pb in crop samples was measured.The bioconcentration factor(BCF)of heavy metal elements was calculated.The migration and transformation and ecological effects of heavy metal in the soil-crop system are analyzed.The results showed that:① The topsoil in the study area is predominantly a-cidic in the study area.The average contents of As,Cd,Cr,Hg,Ni,Pb,Cu,and Zn in the surface soil in the area were 13.57×10-6,0.33×10-6,87.06×10-6,0.153×10-6,27.49×10-6,30.46×10-6,27.94×10-6,82.53×10-6.Respectively,all of which were higher than the national soil background values.②The heavy metal content in rice crops is higher than that in Lipu taro,citrus,and horseshoe.The heavy metal content is also different in rice roots,stems,and seeds.③ The bioaccumulation coefficient of heavy metal was generally high in rice.When comparing different parts of rice,the bioconcentration coefficients of heavy metals were greatest in the roots and least in the seeds.And when comparing different crops,the migration capacity of heavy metals in the soil-rice system was sig-nificantly higher than that of Lipu taro,citrus and water chestnut.④ The exchangeable state of Cd in the study area is significantly higher than As,Cr,Hg,and Pb.Cd is the most active soil heavy metal in the study area,it should be paid more attention to prevent excessive Cd in crops from causing harm to people.
Lipu cityheavy metalssoilcropsmigration and transformationecological effects
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