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平菇、榆黄菇对农田土壤重金属的修复试验

Remediation Experiment of Heavy Metal Soil in Farmland by Pleurotus ostreatus and Pleurotus citrinopileatus

  • 摘要: 以平菇(Pleurotus ostreatus)、榆黄菇(Pleurotus citrinopileatus)为试材,采用覆土栽培方式修复韶关市某重金属污染区农田土壤,研究平菇、榆黄菇覆土栽培对土壤中重金属镉(Cd)、铜(Cu)、锌(Zn)污染的吸收积累特性以及修复效应,以期为后续食用菌修复重金属污染土壤提供参考依据。结果表明:平菇与榆黄菇的子实体和菌糠对污染土中的Cd、Cu、Zn均具有富集能力,其中2种食用菌对Cd、Zn的修复效果最优,均能使土壤中的Cd、Zn含量降至污染风险筛选值以下,但土壤中Cu含量仍处于污染风险筛选值以上。因此,平菇与榆黄菇均对土壤Cd、Zn重金属复合污染具有较高的修复潜力,可用作修复Cd、Zn农田重金属复合污染土壤。

     

    Abstract: Pleurotus ostreatus and Pleurotus citrinopileatus were used as test materials to repair the farmland soil in a heavy metal contaminated area in Shaoguan city by soil covering cultivation.The absorption and accumulation characteristics and remediation effects of Pleurotus ostreatus and Pleurotus citrinopileatus on heavy metal cadmium(Cd),copper(Cu)and zinc(Zn)pollution in soil were studied,in order to provide reference for the subsequent remediation of heavy metal contaminated soil by edible fungi.The results showed that the fruiting bodies and mushroom bran of Pleurotus ostreatus and Pleurotus citrinopileatus had the ability to enrich Cd,Cu and Zn in contaminated soil.Among them,the two edible fungi had the best remediation effect on Cd and Zn,which could reduce the content of Cd and Zn in soil to below the screening value of pollution risk,but the content of Cu in soil was still above the screening value of pollution risk.Therefore,Pleurotus ostreatus and Pleurotus citrinopileatus had shown high remediation potential for Cd and Zn heavy metal combined pollution in soil,and they were proven to be usable for repairing Cd and Zn farmland heavy metal combined pollution soil.

     

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