The content and fractions of Cd in tea garden soils

and their relationships with soil properties and Cd content in tea leaves were studied.The tea garden soils samples from 12tea gardens were collected from Fenghuang Mountain in east of Guangdong Province.The result showed that the distribution of chemical fractions of Cd in the tea garden soils were:residual-Cd>carbonate-Cd>exchangeable-Cd>Fe/Mn oxides-Cd>organic-Cd.Soil pH value showed significant negative relationships with exchangeable-Cd and residual-Cd

while it showed a significantly positive correlation with organic-Cd.Soil organic matter was positively correlated with Fe/Mn oxides-Cd and organic-Cd

while it was negatively correlated with residual-Cd and exchangeable-Cd.The Cd content in tea leaves was 0.30~0.98mg/kg

and 0.65mg/kg in average.Moreover

a significantly positive correlation was found between the Cd content in tea leaves and exchangeable-Cd

while significantly negative correlation was found between Cd content and soil pH value.In conclusion

the content of Cd in soil and tea leaves in Fenghuang Mountain was not exceed the relevant standards

and the Cd chemical form of soil was mainly influenced by soil pH value and organic matter.This study highlight that Cd content in tea leaves can be adjusted by adjusting soil pH value and the organic matter

by doing this

the quality of tea can be improved.