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| Effect of Rhizospheric Environment of Rice on Bioavailability and Mobility of Cd, Cu, Pb and Zn in AMD Polluted Paddy Soil |
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| KeyWord:acid mine drainage; heavy metals; rice; rhizosphere |
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| Abstract: |
| The effects of root system of rice plants on the fractionation of cadmium, copper, lead and zinc were investigated using rhizobox system from tillering to milk ripe state. The soil samples were taken from the multimetal-contaminated paddy soils due to the irrigation of acid mine drainage for more than 40 years. BCR method was used to evaluate the forms and mobilization of heavy metals in the rhizosphere soil. The results showed that copper, lead and zinc were dominated mainly by the form of lower bioavailability and their mobility was not observed different obviously from non-rhizospheric soil to the rhizosphere soil. Howerver, there was a significant change in the forms of cadmium. The acetic acid extractable Cd in the root compartment was 3 times higher than that in the other compartments. Cd content in different soil layers showed an initial increase and then a decrease and a final increase pattern with the growth stages. Furthermore, it showed that, unlike Cu, Pb and Zn, Cd concentration in root compartment decreased significantly at the milk ripe stage indicating a rapid uptake of Cd in the later growth stage. |
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