短轮伐期矮林柳对污染土壤中镉的修复

Phytoextraction of Cadmium-contaminated Soil by Short- rotation Coppice Willow

在调研国内外柳树修复土壤镉污染文献的基础上,综述了短轮伐期矮林柳对土壤镉污染的提取情况,旨在为土壤重金属污染的植物修复提供科学依据。研究表明,种植某些短轮伐期矮林柳并收割其地上部分,在一定的生命周期内对土壤镉(Cd)污染治理效果较好。与其他重金属和物种相比,柳树地上部分生物量较大、Cd的累积浓度较高,柳树对Cd的吸收量也较高。柳树对Cd的有效提取要求:①选择适合的污染土壤;②每年落叶之前反复收割其地上部分;③最后对整个植株(包括根以及地上茎)进行收割。结果表明,柳属植物是提取土壤中Cd的一种既环保又经济的植物修复材料,尤其适用于低Cd污染的棕地和农田土壤修复。

This paper reviews the phytoextraction of cadmium in soil using short -rotation coppice willow ai-ming to offer scientific support for phytoremediation of heavy metal polluted soil .Studies show that Cd -pol-luted soil can be cleaned effectively by cultivating and harvesting the aboveground parts of some short -rota-tion coppice willow within a certain crop lifecycle .Cd uptake rates into Salix are high compared with other trace elements and plants .Effective phytoextraction would require：①selection of suitable contaminated soil;②repeated harvest prior to leaf fall;③final removal of the whole plant .Results suggest that willow is one of the environment friendly and economic materials for remediation of cadmium -contaminated soil,especially for agricultural soil and brownfield land .