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Lin Qi; Zheng Chun-rong; Chen Huai-man (Institute of Soil Science, Academia Sinica, Nanjing 210008)Chen Ying-xu (Dept. of Environmental science, Zhejiang Agricultural University, Hangzhou 310029)  
This paper deals with the distribution adn transformation of cadmium species in rhizosphere adn nonrhizosphere of wheat and rice in red soil and yellow brown soil using a rhizobos or rhizobag and a sequential estraction procedure fo rthe speciation of Cd.Results showed that predominant species of Cd in two soils are not same.EXC-Cd(exchangeable-Cd) is the nost important form in red soil while in yillow brown soil Carb-Cd(bound to iron adn manganese oxides )and OM-Cd(bound to organic matter )in rhizosphere of rice are higher than those in nonrhizosphere, which may be due to the activity of rice root and the action of microorganisms on the root surface.Thh interaction between Pb and Cd showed that the content of EXC-Cd is higher in the jpresence of Pb in both rhizophere and norhizosphere, the content of OM_Cd ,however, is much lower in the presence of Pb.
【Fund】: 国家自然科学基金!29477276;;中国科学院土壤圈物质循环开放研究实验室基金
【CateGory Index】: X171
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