添加凹凸棒土和钠基蒙脱石对铜锌镉污染红壤的改良效应研究
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国家重点基础研究发展规划(973)项目(2007CB936604)和中国科学院知识创新工程重要方向项目(KSCX2-YW-N-38)资助。


Studies on modified effects of attapulgite and Na-montmorillonite on Cu-Zn-Cd contaminated red soil
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    摘要:

    通过温室盆栽试验,开展了凹凸棒土和钠基蒙脱石处理对铜锌镉污染红壤的改良效应研究。结果表明:添加凹凸棒土和钠基蒙脱石处理能显著增加黑麦草(Lolium multiflorum Lam)两茬的地上部生物量(鲜重)。未施入改良剂时,两茬黑麦草地上部的生物量分别为是 7.60 g/盆和 5.67 g/盆,添加 80 g/kg 凹凸棒土处理的两茬地上部生物量分别增加了184% 和 159%添加 80 g/kg 钠基蒙脱石处理的两茬地上部生物量分别增加了113% 和 99.3%。黏土矿物的加入使土壤的 pH 提高了 0.26 ~ 1.02 个单位,从而降低了植株对 Cu、Zn、Cd 的生物有效性。随着添加量从 20 g/kg 增加到 80 g/kg,黑麦草地上部 Cu、Zn、Cd 的含量降低,钠基蒙脱石钝化 Cu、Cd 的效果好于凹凸棒土,但两者钝化 Zn 的效果没有显著差异性。添加 40 g/kg 和 80 g/kg 的凹凸棒土或钠基蒙脱石处理都显著降低了污染土壤 TCLP 提取液中 Cu、Zn 的浓度,对于 TCLP 提取液中 Cd 浓度的显著降低只有添加 80 g/kg 的凹凸棒土这一种处理达到。

    Abstract:

    The greenhouse pot experiment was conducted to investigate the modified effects of attapulgite and Na-Montmorillonite on Cu-Zn-Cd contaminated red soil. The results showed that the above-ground biomass of ryegrass (Lolium multiflorum Lam) of the two crops significantly increased with the application of the two kinds of clays. The fresh biomass of the two crops were 7.60 g/pot and 5.67 g/pot for the CK treatment respectively, and the biomass increased by 184% and 159% with the application of 80 g/kg attapulgite, and increased by 113% and 99.3% with the application of 80 g/kg Na-Montmorillonite. Application of the two clays increased soil pH value from 0.26 units to 1.02 units, and decreased the bioavailability of Cu, Zn and Cd. Cu, Zn and Cd concentrations in the ground part of ryegrass decreased as the addition amount of the two clays increased from 20 g/kg to 80 g/kg. The reductions in Cu and Cd concentrations were in the order of Na-Montmorillonite > attapulgite, and there was no significant differences for Zn. Available Cu and Zn in the TCLP extractant solutions significantly decreased with the application of 40 g/kg and 80 g/kg attapulgite and Na-Montmorillonite, while available Cd significantly decreased only with the application of 80 g/kg attapulgite.

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林云青,章钢娅,许 敏,刘总堂,龚 华.添加凹凸棒土和钠基蒙脱石对铜锌镉污染红壤的改良效应研究[J].土壤,2009,41(6):892-896. LIN Yun-qing, ZHANG Gang-ya, XU Min, LIU Zong-tang, GONG Hua. Studies on modified effects of attapulgite and Na-montmorillonite on Cu-Zn-Cd contaminated red soil[J]. Soils,2009,41(6):892-896

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