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Accumulation and distribution of arsenic and cadmium by tea plants

Yuan-zhi SHI,Jian-yun RUAN,Li-feng MA,Wen-yan HAN,Fang WANG(Tea Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou 310008,China)  
It is important to research the rules about accumulation and distribution of arsenic and cadmium by tea plants,which will give us some scientific ideas about how to control the contents of arsenic and cadmium in tea.In this study,by field investigation and pot trial,we found that mobility of arsenic and cadmium in tea plants was low.Most arsenic and cadmium absorbed were fixed in feeding roots and only small amount was transported to the above-ground parts.Distribution of arsenic and cadmium,based on their concentrations of unit dry matter,in tea plants grown on un-contaminated soil was in the order:feeding rootsstems≈main rootsold leavesyoung leaves.When tea plants were grown on polluted soils simulated by adding salts of these two metals,feeding roots possibly acted as a buffer and defense,and arsenic and cadmium were transported less to the aboveground parts.The concentration of cadmium in soil significantly and negatively correlated with chlorophyll content,photosynthetic rate,transpiration rate and biomass production of tea plants.
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