油菜作为超累积植物修复镉污染土壤的潜力

The phytoremediation potential of oilseed rape (B. juncea) as a hyperaccumulator for cadmium contaminated soil

以超累积植物印度芥菜为参比植物,通过温室盆栽土培试验研究了筛选出的两种芥菜型油菜的吸Cd特征和作为超累积植物修复Cd污染土壤的潜力.试验结果表明,土壤中Cd浓度在0～20mg/kg范围内,油菜溪口花籽的地上部生物量、地上部吸Cd量和对土壤的净化率均明显高于朱苍花籽油菜和参比超累积植物印度芥菜.体内Cd浓度也和印度芥菜相当,其吸收的Cd 88%以上分布在地上部且有较强的耐Cd毒能力.油菜溪口花籽具备超累积植物的特征且有较强的修复Cd污染土壤的能力.

The Cd uptake character of two kinds of selected mustard-typed oilseed rape and their potential as ahyperaccumulator in the phytoremediation of Cdcontaminated soil were studied with greenhouse pot cultivationexperiment and hyperaccumulator of Indian mustard as comparing plant. The results indicate that oilseed rapeXikou huazi has markedly higher shoot biomass, Cd uptake amount and soil purification rate than Zhucang huazi and Indian mustard when the Cd concentration in soil is 0 to 20mg/kg. The Cd concentrations in shoot and root of the two oilseed rapes and Indian mustard are not significantly different; above 88% of the Cd uptake distributes in shootes with stronger resistibility of Cd toxicity. Xikou huazi has hypeaccumulator character and stronger remediability of Cd contaminated soil.