耐镉菌联合植物吸收对土壤重金属镉污染的修复

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采用盆栽和大田试验,研究耐镉菌联合超积累景天植物吸收对土壤重金属镉污染的修复作用。结果表明:耐镉菌与十二烷基苯磺酸钠均可活化土壤中难溶态镉,其中十二烷基苯磺酸钠对铁锰结合态镉的活化效果较好,而耐镉菌对残渣态镉的活化能力较好;土壤中潜在可利用态镉转化为活性态镉后可通过贝洋棒(BY棒)或栽培超积累植物来吸收;在耐镉菌与景天植物的联合修复中,伴矿景天所吸收的镉远高于凹叶景天和东南景天的联合修复效果,且修复后土壤的酶活性强,微生物数量丰富。可见,耐镉菌与伴矿景天的联合修复是一种可行的镉污染修复方法。
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