超积累植物壶瓶碎米荠的镉富集

Cadmium accumulation in hyper accumulator Cardamine hupingshanensis

通过野外调查和人工栽培试验,研究了壶瓶碎米荠(Cardamine hupingshanensis)植株的镉含量。在自然条件下,壶瓶碎米荠植株平均镉含量随着生长时间的推移而增加;地上部镉含量变化范围为189～3 800 mg/kg,地上部与地下部镉含量的比值为1.13,变化范围为0.83～1.42;富集系数的平均值为209.10,变化范围为42.28～913.50。在人工栽培条件下,壶瓶碎米荠地上部镉含量随土壤中镉浓度的增加而增加,当土壤中镉含量超过50.00mg/kg,生物产量开始降低。在相同的土壤条件下,大棚栽培条件下壶瓶碎米荠植株富集镉能力和生物产量均好于露天栽培条件。表明,壶瓶碎米荠是一种生物产量高、富集镉能力强的超积累新材料,在土壤镉污染修复方面具有比较好的应用前景。

Under wild condition and artificial cultivation condition,the cadmium（Cd） concentration in Cardamine hupingshanensis was studied.In wild condition,the Cd content in the upground plant of C.hupingshanensis was increased gradually,the range being 189 to 3 800 mg/kg.The average ratio of upground Cd to underground Cd of C.hupingshanensis was 1.13,the range being 0.83 to 1.42.The average bioaccumulation factor was 209.10,the range being 42.28 to 913.50.In artificial cultivation condition,the Cd concentration in C.hupingshanensis was increased with the increase of Cd concentration in soil.When the Cd content in soil exceeded 50.00 mg/kg,the yield of C.hupingshanensis began to decrease.Under the same soil condition,the Cd accumulation ability and yield of C.hupingshanensis in greenhouse were much better than those in field.The results indicated that Cardamine hupingshanensis had considerable application potential for phytoremediation of Cd contamination.