Distribution Characteristics of Lead and Its Affecting Factors in the Tea Garden Soils of Fenghuang Mountain,East of Guangdong Province

The fractionation of Pb in tea garden soils and the relationships between Pb fraction and soil properties,Pb contents in tea leaves were studied by collecting the tea garden soils from 12 tea gardens of Fenghuang mountain in east of Guangdong province.The results showed that the distribution of chemical fractions of Pb in the tea garden soils were decreased in the order: Residual-PbFe/Mn oxides-Pbexchangeable-Pborganic-Pbcarbonate-Pb.Correlation analyses showed that soil organic matter was significantly negative correlated with ex-Pb and high significantly negative correlated with carb-Pb.Soil pH was high negative correlated with ex-Pb,significantly positive correlated with carb-Pb and or-Pb.The bioavailability characteristic of Pb in 60 soils of tea gardens was between 0.029 and 0.113,0.061 in average.The mobility characteristic of Pb in 60 soils of tea gardens was between 0.021 and 0.078,0.044 in average.In addition,results showed that the Pb contents in tea leaves were between 1.39 mg/kg and 1.82 mg/kg,1.56 mg/kg in average.What's more,the significantly positive correlation was found between the Pb contents in tea leaves and Fe/Mn-Pb and or-Pb,high significantly positive correlated with soil organic matter.