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不同镉水平下纳米沸石对土壤pH、CEC及Cd形态的影响
摘要点击 2465  全文点击 841  投稿时间:2016-10-17  修订日期:2016-11-19
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中文关键词  土壤镉污染  纳米沸石  土壤pH  土壤CEC  土壤-植物Cd形态分布
英文关键词  soil Cd contamination  nano zeolite  soil pH  soil CEC  distribution of Cd fractions in plant and soil
作者单位E-mail
迟荪琳 西南大学资源环境学院, 重庆 400715 chisunlin@163.com 
徐卫红 西南大学资源环境学院, 重庆 400715 xuwei_hong@163.com 
熊仕娟 西南大学资源环境学院, 重庆 400715  
王卫中 西南大学资源环境学院, 重庆 400715  
秦余丽 西南大学资源环境学院, 重庆 400715  
赵婉伊 西南大学资源环境学院, 重庆 400715  
张春来 西南大学资源环境学院, 重庆 400715  
李彦华 西南大学资源环境学院, 重庆 400715  
李桃 西南大学资源环境学院, 重庆 400715  
张进忠 西南大学资源环境学院, 重庆 400715  
熊治庭 武汉大学资源环境学院, 武汉 430079  
王正银 西南大学资源环境学院, 重庆 400715  
谢德体 西南大学资源环境学院, 重庆 400715  
中文摘要
      通过室内培养试验及土培试验研究了不同镉水平(1、5、10和15 mg·kg-1)下纳米沸石和普通沸石对土壤pH、CEC及Cd形态的影响.结果表明,室内培养试验中,施用沸石(5、10和20 g·kg-1)均显著提高了不同镉(1、5、10和15 mg·kg-1)处理中的土壤pH和土壤CEC值,降低了土壤可交换态镉含量,增加了碳酸盐结合态、铁锰氧化态、有机态和残渣态镉含量,以纳米沸石(20 g·kg-1)对土壤可交换态镉的降低效果最好.土壤pH、土壤CEC与土壤可交换态镉含量呈极显著负相关(P<0.01),与铁锰氧化态镉含量均呈极显著正相关(P<0.01).土培试验中,在1 mg·kg-1和5 mg·kg-1 Cd条件下,施用沸石(5、10和20 g·kg-1)使土壤可交换态镉FDC降低了6.4%~63.2%,使大白菜地上部去离子水提取态镉和乙醇提取态镉的分配比例分别降低了2.1%~56%和11.8%~100%,相同沸石使用量下的降低效果以纳米沸石优于普通沸石.在1 mg·kg-1 Cd条件下,大白菜地上部镉形态的FDC与土壤CAB-F和OM-F的FDC有显著相关性(P<0.05);在5 mg·kg-1 Cd条件下,大白菜地上部镉形态的FDC主要与土壤OM-F和RES-F形态的FDC存在显著相关性(P<0.05).
英文摘要
      Soil incubation experiment and pot experiment were carried out to investigate the influence of nano zeolite (NZ) and ordinary zeolite (OZ) on the soil pH, cation exchange capacity, concentration of soil Cd, soil Cd fraction and Cd uptake by Chinese cabbage when exposed to different Cd pollution levels(1, 5, 10 and 15 mg·kg-1). The results of soil incubation experiment showed that the nano zeolite and ordinary zeolite dose(5, 10 and 20 g·kg-1) increased the soil pH and cation exchange capacity, and decreased the concentration of soil exchangeable Cd, while increased the concentration of Cd in carbonate, Fe-Mn oxide, organic matter and residual fraction. The lowest EX-Cd was observed in the high nano zeolite (20 g·kg-1) treatment. The soil pH and cation exchange capacity was extremely negatively correlated with the concentration of soil exchangeable Cd(P<0.01),and extremely positively correlated with the concentration of soil Fe-Mn oxide Cd(P<0.01). The results of pot experiment showed that the FDC of exchangeable Cd in soil decreased by 6.4%-63.2%, and the FDC of water-extractable and ethnol-extractable Cd in Chinese cabbage decreased by 2.1%-56% and 11.8%-100% with zeolite application, respectively. Moreover, the reduction effect of nano zeolite on Cd concentration in soil and plant was better than that of ordinary zeolite. The FDC of Cd fraction in shoot of Chinese cabbage showed correlation with the FDC of carbonate Cd and organic matter Cd in soil(P<0.05) when exposed to 1 mg·kg-1 Cd pollution. Moreover, correlation was also found in the FDC of organic matter Cd and residual Cd in soil(P<0.05) under 5 mg·kg-1 Cd pollution.

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