Abstract:By soil culture and pot experiments, an agricultural soil seriously polluted by heavy metals (total concentrations of Pb and Cd are 1 277 mg/kg and 39.0 mg/kg, respectively) was used to study soil metal stabilization with in incubatin experiment the amendments of sepiolite, lime, humic acid, calcium magnesium phosphate, phosphate rock powder and biochar. The results showed that the addition of different amendments changed soil pH and metal availability, lime addition induced highest reduction in soil available Pb and Cd concentrations, followed by sepiolite, but there was no significant difference in soil metal availabilities between treatments with high doses of lime or sepiolite; the low dose biochar (0.1 g/kg) significantly increased soil available Pb and Cd concentrations, while high dose biochar decreased the metal availability. In pot experiment the addition of mixture of sepiolite-lime gave the highest reducing effects on soil pH and available metals. compared to control soil, the addition of sepiolite and lime together decreased soil Pb and Cd availabilities by 97.5 and 81.4%, respectively, and Cd and Pb concentrations in roots and shoots decreased by 48.5% and 34.0%, and 35.6% and 29.6%, respectively; but the addition of mixture of sepiolite-phosphorated materials significantly increased Pb concentration in roots but decreased Pb concentrations in shoots, and had no significant effects on Cd concentrations in plants. The above results show that adding appropriate soil amendments can significantly reduce heavy metal availability and plant metal uptake in heavy metal severely contaminated soil.