七种本土植物对土壤中镉的富集效果比较研究

Comparative study on the soil cadmium enrichment effects of seven indigenous plant species

针对河南省新乡市王村镇及其周边地区镉污染现状,选取7种长势较好的本土植物,对其镉富集特征和修复效果进行了对比分析。结果表明,草本植物的镉耐受能力整体高于灌木或乔木,但紫薇(Lagerstroemia indica L.)表现出较高的富集能力和转移系数;狗尾草[Setaria viridis(L.)Beauv.]根中镉含量达82.5 mg/kg,根部富集系数为3.149;苋菜(Amaranthus tricolor L.)各部分镉含量、转移系数和富集系数在7种植物中均处于优势地位。综合分析认为,苋菜、狗尾草和紫薇可作为该区域Cd高富集植物来净化土壤。

Aiming at the present serious situation of soil Cd pollution in Wangcun town and around areas,Xinxiang city of Henan province,7 native plants with good growth potential were selected and their cadmium enrichment characteristics and remediation effects were compared.The results showed that herbaceous plants had a stronger tolerance to Cd in contaminated soil than shrubs or trees on the whole.However Lagerstroemia indica L.presented a notable enrichment ability and transfer coefficient;The content of Cd in root of Setaria viridis(L.)Beauv.was 82.5 mg/kg,and the enrichment coefficient of root was 3.149;The content of Cd,transfer coefficient and enrichment coefficient of each part of Amaranthus tricolor L.were superior to other plant species.According to the comprehensive analysis,Amaranthus tricolor L.,Setaria viridis(L.)Beauv.and Lagerstroemia indica L.all can be used as Cd high enrichment plants for soil remediation in this area.