三叶草(Trifolium repens)用于土壤镉污染的修复潜力

刘勇; 刘燕; 杨丹; 梁清; 娄杰

文章摘要

刘勇,刘燕,杨丹,梁清,娄杰.三叶草(Trifolium repens)用于土壤镉污染的修复潜力[J].农业环境科学学报,2017,36(11):2226-2232.

三叶草(Trifolium repens)用于土壤镉污染的修复潜力

Remediation potential of Trifolium repens used in cadmium-contaminated soils

投稿时间：2017-04-10

DOI：10.11654/jaes.2017-0518

中文关键词: Cd污染土壤修复潜力三叶草

英文关键词: cadmium pollution soil remediation potential Trifolium repens

基金项目:贵州省科学技术厅自然科学基金联合基金项目（黔科合LH字[2014]7168号，LKG[2013]23号）；贵州省应用基础研究计划重大项目（黔科合J重大字[2015]2001号）；国家级大学生创新创业训练计划平台项目（201510976051）

作者	单位	E-mail
刘勇	贵阳学院生物与环境工程学院, 贵阳 550005 中国科学院大学, 北京 100049 中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002
刘燕	贵阳学院生物与环境工程学院, 贵阳 550005	gyly68@sina.com
杨丹	贵阳学院生物与环境工程学院, 贵阳 550005
梁清	贵阳学院生物与环境工程学院, 贵阳 550005
娄杰	贵阳学院生物与环境工程学院, 贵阳 550005

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中文摘要:

通过温室盆栽试验法，研究了土壤镉（Cd）污染下三叶草对土壤Cd的富集特征及土壤Cd的净化能力等，以期为三叶草对土壤Cd的生态修复提供依据。结果表明：三叶草具有较好的Cd耐受性，总生物量增加值介于2.0~3.7 g。随着土壤Cd处理浓度增加，三叶草根、茎、叶中Cd含量分别高达178.6、101.3、130.9 mg·kg^-1，富集系数（BF）分别介于9.7~17.9、3.0~10.1、3.1~13.1，富集能力大小总体表现为根 > 叶 > 茎，转运系数（TF）值均≥ 1（除T2处理），表明三叶草有较强的Cd富集能力，且能较好地将Cd转运至地上部位；三叶草根、茎、叶对Cd的吸收量均随着土壤Cd处理浓度的升高而递增，地上部位（茎、叶）吸Cd百分率（占总吸Cd量）最高达87.2%，对土壤Cd净化率最高达6.2%。因此得出三叶草具有作为Cd超积累植物的较好潜力，可以进行污染区域美化改造和Cd污染修复。

英文摘要:

In this study, the enrichment characteristics and purification capacity of Trifolium repens for cadmium in soil were investigated in order to provide a reference for ecological restoration of cadmium. The results showed that the added value of T. repens biomass reached 2.0~3.7 g, indicating that T. repens could have a high tolerance for cadmium. Cadmium accumulation in the roots, stems, and leaves of T. repens reached 178.6, 101.3 mg·kg^-1, and 130.9 mg·kg^-1, respectively, as the concentration of cadmium increased. The bioaccumulation factor values of the roots, stems, and leaves were 9.7~17.9, 3.0~10.1, and 3.1~13.1, respectively, and the ability of cadmium to accumulate in different parts of T. repens was decreased in the order of roots > leaves > stems. The translocation factor values for cadmium in T. repens were all greater than 1(except T2 treatment). These data indicated that T. repens could have a strong capacity for cadmium enrichment and could easily transport cadmium into the soil. The amount of cadmium uptake of T. repens increased diversely with the different cadmium treatments in soils; in particular, the cadmium uptake of the aboveground parts(stems and leaves) of T. repens reached 87.2%, and the purifying rate of cadmium in soils was as high as 6.2%. Based on these findings, T. repens was found to have promising applications in beautifying surroundings and repairing cadmium-contaminated soils.

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