Analysis on Contents of Heavy Metals in Soils and Plants of Youcha(Camellia)in Nandan County
In order to understand distribution and enrichment characteristics of heavy metals in soils and plants of Youcha(Camellia)in Nandan county,taking Youcha(Camellia)forests in core demonstration area of Yun-shuigu Youcha(Camellia)industry as research objects,contents of lead(Pb),chromium(Cr),arsenic(As),mer-cury(Hg)and cadmium(Cd)in soils and plants of Youcha(Camellia)were determined and analyzed.Results showed that average contents of five heavy metals in soils were Cr(50.78 mg/kg)>Pb(14.29 mg/kg)>As(5.45 mg/kg)>Cd(0.39 mg/kg)>Hg(0.15 mg/kg).Average contents of Cr,Pb,As and Hg were lower than risk screen-ing values for soil contamination of agricultural land.Average contamination index of Cd was 1.30,which be-longed to mild contamination.Comprehensive contamination index of soil heavy metals was 0.97,which was at warning level.Contents of different heavy metals in leaves,branches and fruits of Youcha(Camellia)were dif-ferent.Content of Cr was higher in leaves,and contents of Pb,Cd,As and Hg were higher in branches.Five heavy metals were not tested or had lower contents in fruits.Branches had strong absorbing capacities to Cd,and leaves had certain absorbing capacities to Cd.Leaves and branches had certain absorbing capacities to Pb,As and Hg,and had low absorbing capacities to Cr.Fruits had low absorbing capacities to five heavy metals.
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