矿山强酸性多金属污染土壤修复及麻疯树植物复垦条件研究

采用温室盆栽实验,研究了在不同剂量(质量分数分别为0、0.10%、0.25%、0.5%和1.0%)石灰石改良条件下,大宝山矿强酸性多金属不同污染程度土壤中麻疯树的生长状况和吸收金属特征,并探讨了麻疯树在酸性土壤中生长的抑制因素和石灰石改良适宜剂量.研究表明,在低污染酸性土壤中,Cu和Pb的高活性可能是抑制麻疯树生长的主要因素;而在高污染酸性土壤中,Cd、Cu、Zn等金属的高活性及由强酸引起的Al毒也可能是抑制麻疯树生长的主要因素;石灰石通过提高土壤pH值和降低多金属的生物有效态含量,促进了麻疯树在低污和高污土壤中的生长,其最佳剂量分别为0.25%和0.5%;石灰石可以不同程度地降低麻疯树地上部和地下舔的Cd、Cu、Pb、Zn和Al含量,同时随石灰石用量的增加,其金属含量基本呈降低趋势;麻疯树地下部金属含量高于地上部,且石灰石对麻疯树地下部金属(除Cd外)含量降低幅度较地上部大.因此,种植麻疯树与石灰石改良是联合修复大宝山矿酸性多金属污染土壤的有效措施之一.

Remediation of strongly acidic mine soils contaminated by multiple metals by plant reclamation with Jatropha curcas L. and addition of limestone

In a greenhouse pot experiment,the dose-response effects of limestone addition (mass fractions 0,0.1%,0.25%,0.5% and 1.0%) on the growth performance and metal uptake characteristics of Jatropha curcas L. grown on different multi-metal contaminated,strongly acid soils from Dabao Mountain mine were studied. Factors suppressing plant growth as well as the feasible dosage of limestone are also discussed. In the soils with lower levels of pollution,high bio-availabilities of Cu and Pb appeared to be the primary ...