中文摘要：

超富集植物是重金属污染土壤植物提取修复的基础,超富集植物的筛选一直都是污染土壤植物修复研究的热点及前沿.采用盆栽实验对7种农作物积累Cd的特征进行研究,结果表明,叶用红菾菜对Cd具有较高的富集系数和转移系数.在此基础上,采用盆栽浓度梯度试验对叶用红菾菜对Cd的富集潜力及富集特征进行了系统研究.结果表明,在Cd污染水平为20 mg·kg^-1条件下,叶用红菾菜地上部Cd含量超过了100 mg·kg^-1这一国际公认的Cd超积累植物应达到的临界含量标准;且其对Cd的富集系数和转移系数均大于1;同时,与对照相比,植物的生长未受到抑制,这表明叶用红菾菜是一种Cd超积累植物,为Cd污染土壤的植物修复提供了一种新的种质资源.

英文摘要：

Hyperaccumulators are the base of phytoextraction. It is difficult to screen out ideal hyperaccumulators that can remediate soil contaminated with heavy metals effectively. A pot experiment was conducted to investigate the characteristics of accumulating Cd by seven crops. The results showed that Cd in shoot of Beta vulgaris var.cicla L. was the highest among all plants, and Cd concentration in shoot of Beta vulgaris var.cicla L. was higher than that in root. Another pot experiment was arranged with various Cd concentrations to study Cd accumulation, tolerance of Beta vulgaris var.cicla L. and its potential for pbytoremediation. The average concentration of Cd in shoots of Beta vulgaris var.cicla L. treated with 20 mg .kg-~ （Cd） was more than the accepted critical concentration of 100 mg·kg^-l. The Cd enrichment coefficient （EC） and translocation factor（TF） of Beta vulgaris var.cicla L were higher than 1. Moreover, compared with the control, the growth of Beta vulgaris var.cicla L. in the treatment of 20 mg·kg^-1（Cd） was not inhibited, so, Beta vulgaris var.cicla L. was a cadmium hyperaccumulator and could be applied to phytoremediate Cd-contaminated soils.