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    卫泽斌, 郭晓方, 吴启堂, 陈晓红. 混合螯合剂的不同施加方式对重金属污染土壤套种修复效果的影响[J]. 华南农业大学学报, 2016, 37(1): 29-34. DOI: 10.7671/j.issn.1001-411X.2016.01.005
    引用本文: 卫泽斌, 郭晓方, 吴启堂, 陈晓红. 混合螯合剂的不同施加方式对重金属污染土壤套种修复效果的影响[J]. 华南农业大学学报, 2016, 37(1): 29-34. DOI: 10.7671/j.issn.1001-411X.2016.01.005
    shu
    WEI Zebin, Guo Xiaofang, WU Qitang, CHEN Xiaohong. Effects of different application methods of mixed chelators on remediation of heavy metal contaminated soil in interplanting system[J]. Journal of South China Agricultural University, 2016, 37(1): 29-34. DOI: 10.7671/j.issn.1001-411X.2016.01.005
    Citation: WEI Zebin, Guo Xiaofang, WU Qitang, CHEN Xiaohong. Effects of different application methods of mixed chelators on remediation of heavy metal contaminated soil in interplanting system[J]. Journal of South China Agricultural University, 2016, 37(1): 29-34. DOI: 10.7671/j.issn.1001-411X.2016.01.005
    shu

    混合螯合剂的不同施加方式对重金属污染土壤套种修复效果的影响

    Effects of different application methods of mixed chelators on remediation of heavy metal contaminated soil in interplanting system

      摘要
    • 摘要:
      目的 开发具有应用前景的植物与化学联合修复重金属污染土壤的技术。
      方法 通过盆栽试验，研究混合螯合剂(MC)的不同施用方式对东南景天Sedum alfredii和玉米Zea mays 套种系统的影响，探讨MC作为植物提取的强化剂和重金属的淋洗剂对土壤的修复效果。
      结果 东南景天和玉米套种情况下，MC可以提高植物对重金属提取的效率，也可以淋洗出土壤中的部分重金属，其中MC分2次淋洗时淋出的重金属量显著大于单次淋洗。经过套种和MC淋洗后，土壤全量Cd、Zn和Pb含量降低幅度分别为30.7%~33.0%、11.9%~14.7%和13.3%~16.4%。东南景天和玉米套种的共有根际土壤微生物数量与单种植物的不同，施加MC后显著提高了套种共有根际的细菌和放线菌数量，然而，高剂量MC淋洗时共有根际的微生物数量又会下降。
      结论 套种和MC淋洗联合技术对土壤重金属的去除量大于植物提取的；Pb的去除主要靠淋洗，Zn/Cd可以用植物提取去除，套种+淋洗可以加快对Zn/Cd/Pb复合污染土壤的修复。

       

      Abstract:
      Objective To develop a plant-chemical remediation technique in soil contaminated by heavy metals with application prospects.
      Method Mixed chelators (MC) were applied to Sedum alfredii and Zea mays interplanting system with different application methods in pot experiments. As a fortification agent for phytoextraction and a washing agent for heavy metals, the effects of MC on soil remediation were studied.
      Result The efficiency of heavy metal extraction by plants was improved and soil heavy metals could be partly leached by MC in S. alfredii and Z. mays interplanting system. Heavy metal amounts washed by MC twice were more than that of a single washing. Through interplanting and chemical washing, total Cd, Zn and Pb in soil decreased by 30.7%-33.0%, 11.9%-14.7% and 13.3%-16.4% respectively. The number of soil rhizospheric microorganism was different from that of a single crop in the S. alfredii and Z. mays interplanting system. MC application increased the number of bacteria and actinomycetes in the interplanting system, while high dosage MC washing reduced the number of soil microorganisms.
      Conclusion The removal of heavy metals by combining interplanting with chemical washing technology is more efficient than by phytoextraction. Zn and Cd removal can be achieved by phytoextraction while Pb removal mainly relies on MC washing. The interplanting and washing technique can accelerate remediation of Cd, Zn and Pb in combination pollution soils.

       

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