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  

Studies on Modified Effects of Attapulgite and Na-Montmorillonite on Cu-Zn-Cd Contaminated Red Soil

作　　者：林云青[1,2] 章钢娅[1] 许敏[1,2] 刘总堂[1,2] 龚华[1] 

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049

出　　处：《土壤》2009年第6期892-896,共5页Soils

基　　金：国家重点基础研究发展规划(973)项目(2007CB936604);中国科学院知识创新工程重要方向项目(KSCX2-YW-N-38)资助

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7.60g/盆和5.67g/盆,添加80g/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80g/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20g/kg增加到80g/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40g/kg和80g/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80g/kg的凹凸棒土这一种处理达到。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 Lain） 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 ofCu, 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 ofNa-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.

关 键 词：黑麦草 凹凸棒土 钠基蒙脱石 重金属 

分 类 号：X53[环境科学与工程—环境工程]