Study Of Soil Remediation Of Sisal And Lime On Cu-Cd-contaminated Soil

Through the methods of adding Cu and Cd into unpolluted Granitic latosol in Hainan, after 2 weeks equilibrium, adding lime, planting the sisal on the polluted soil by Cu and Cd, we had studied Cu and Cd concentration, translocation and accumulation in different parts of sisal, tested the agro-chemical properties of the soil. The major results were summarized as follows:1. The sisal growth responses were obviously different on soil Cu at varied levels from 0.0 to 2000 mg/kg. At Cu levels of 1000 mg/kg, the sisal could grow normally. The sisal growth was limited with the improvement of Cu contents in soils. At Cu levels of 2000mg/kg , the sisal could not grow and die. Meanwhile Cu concentration in shoots was higher than in roots, the translation coefficient of sisal was less than 1 and the accumulation coefficient was lower than CK.2. The sisal could grow normally at Cd levels of 50 mg/kg.the sisal growth was limited at Cd levels of 100mg/kg. Meanwhile Cd concentration in shoots was higher than in roots, the translation coefficient of sisal was less than 1 and the accumulation coefficient was lower than CK.3. The results showed that adding calcareousness could improve the growth of sisal effectively and inhibit the uptake of heavy metals on Cu, Cd polluted soil . while the activity of Cu and Cd in soils were reduced. Meanwhile the calcareousness could restrain the translation coefficient of sisal.4. When soil Cu was 500mg/kg, the best dosage was 3375kg/ha. When soil Cu was 1000mg/kg the best dosage was 4500kg/ha, this combination of sisal and calcareousness could transplant Cu twice time more than that of only plant sisal. When soil Cu was 2000mg/kg adding calcareousness could effectively improve the growth of sisal.5. When soil Cd was low 50mg/kg adding calcareousness could effectively improve the growth of sisal. Meanwhile the calcareousness could restrain the translation coefficient of sisal. Under the same level of Cd pollution, the Cd transition of sisal was not improved with adding calcareousness in soil . That is to say calcareousness did not accelerate the sisal transport more Cd. However when soil Cd was 100mg/kg adding calcareousness could effectively improve the growth of sisal.