入侵植物假苍耳对土壤中铜、铅重金属污染的富集特征

通过室内盆栽试验研究入侵植物假苍耳(Iva xanthifolia)在营养生长阶段对铜、铅的耐性及富集特征。实验结果表明，在1~16 mg·L^-1的添加铜处理及0.5~14 mg·L^-1的添加铅处理条件下，假苍耳对铜、铅两种单一金属均有很强的耐性及富集作用，重金属在植物体地上部和地下部的富集量分别为607.59、137.20，404.38、34.53 mg·kg^-1，对应的富集系数为11.39、4.18，转运系数4.43、11.71，且重金属在植物体内的分布规律均表现为：茎部＞叶片＞根部，地上部分的积累量远大于地下部分。对叶色、株高及生物量等特征的观察表明假苍耳的生长未受到抑制，符合超富集植物的基本特征。与一般超富集植物相比，假苍耳作为一种外来入侵植物，具有生长迅速、植物材料易得，生物量大且分布范围广的优点。

Cu,Pb accumulation of invasive plant Iva xanthifolia

The hydroponic experiments were conducted to study the Cu and pb accumulation characteristics of invasive plant Iva xanthifolia. The hydroponics results showed that, I.xanthifolia had high tolerance and a relatively strong enrichment effect on element Cu, Pb in the concentration of 1 to 16 mg·L^-1 Cu, 0.5 to 14 mg·L^-1 Pb, respectively. Moreover the heavy metals accumulation of above-ground parts (shoots) and the under ground parts (roots) reached up to 607.59 mg·kg^-1(137.20 mg·kg^-1), 404.38 mg·kg^-1(34.53 mg·kg^-1) respectively. The enhancement factor and translocation factor were all greater than 1. Their average values were 11.39(4.43), 4.18(11.71) respectively.The enrichment order of all heavy metals is stem>leaf >root. Their metals concentrations in shoot were higher than that in roots. Compared with the control, the overground biomass of I.xanthifolia did not decreased significantly. These showed that I.xanthifolia had hyperaccumulative characteristics of heavy metals and could be applied to bioremediation Cu-contaminated soils, Pb-contaminated soils.