Abstract:

The author used artificial afforestation combined soil amendment experiment for studying influence of soil amendment to Sb heavy metal forms, distribution characteristics and bioavailability, and providing the technical basis for antimony mine area ecological restoration. The results showed that with the increase in discharging amount of soil amendment, soil pH values increased and as per plant use 300 g casting amendment, the soil pH value from acidic becomes alkaline. Different doses of soil amendment on the 0-20 cm and 40-60 cm soil Sb carbonate bound had significant effects and 20-40 cm soil had very significant effect. However, to 40-60 cm residual form had very significant effect. Sb forms had Fe-Mn oxidate state form, organic bound and residual form in 0-20 cm and 20-40 cm soil; but mainly form were organic bound and Fe-Mn oxidate state forms in 40-60 cm soil. Cast amendment increased Sb bioavailability 18.92%-24.23%, decreased Sb potential bioavailability 17.55%-18.92%, decreased Sb non-bioavailability 0.95%-6.03%. In addition, significantly increased the biological activity and the bioavailability of Sb, thus increased the ecological risk of heavy metal Sb, this moment Sb easily absorbed by plants and entered the plant to some extent on the toxic effects of plant.Sb forms have Fe-Mn oxidate state form, organic bound and residual form in 0~20cm and 20~40cm soil;but mainly form were organic bound and Fe-Mn oxidate state forms in 40~60cm soil. Cast amendment can increased Sb bioavailability 18.92%～24.23% ,can decreased Sb potential bioavailability 17.55%～18.92% ,decreased Sb non-bioavailability 0.95%～6.03%.In addition, significantly increased the biological activity and the bioavailability of Sb thus increased heavy metal Sb. ecological risk, this moment Sb easily absorbed by plants and enter the plant to some extent on the toxic effects of plant.