重金属镉在木薯中的积累及对其生长的影响

目的]研究镉污染对木薯（Manihot esculenta Cranz）生长的影响及镉在木薯各部位中的吸收累积规律。方法]以GR911木薯品种为材料,采用土壤盆栽试验,研究不同浓度镉对木薯生长的影响及镉在木薯各部位的吸收分布特点。结果]随着镉浓度的增加,木薯的株高、茎径、叶面积指数及块根重量均有不同程度的降低;木薯吸收的镉,大部分停留在茎部,其次是叶片,少量留在块根中,整体分布特征为茎〉叶〉根。结论]镉对木薯生长有明显的影响,当镉浓度大于30 mg/kg时,木薯表现出明显的毒害作用,且茎、叶对镉的累积系数也呈现下降趋势。

Accumulation of Cadmium in Cassava (Manihot esulenta Granz) and Its Impact on Growth

Objective] To discuss the effects of different concentrations of Cd on cassava growth and absorption and accumulation of Cd.Method] with GR911 as tested cassava cultivar,the effects of different concentrations of Cd on cassava growth,absorption and accumulation of Cd in cassava plant were studied by the pot experiment.Result] With the increasing Cd concentration in soil,the height,stem diameter,leaf area index and weight of root tuber had the trend of reducing.Most Cd was in cassava stem,less in leaves and least in root.The order of Cd concentration from high to low in different parts of cassava was stems>leaves>roots.Conclusion]When the Cd concentration in the soil was over 30 mg/kg,the growth of cassava was restricted obviously.Cassava had obvious toxic effect,and the accumulation factor of Cd in stem and leaves presented declining tendency.