【摘要】 采用土培试验研究了不同水平铅处理下苋菜生长和矿质元素吸收的相关指标。结果表明:较高浓度(0.4 mmol/kg)铅胁迫下苋菜的生长受到明显抑制,其中根受到的抑制程度最高。铅对苋菜第3和第4片成熟叶面积扩展的抑制作用比对叶干物质的积累大,导致单位叶面积干重增大。土壤中过量铅明显增加了苋菜各器官中铅的含量并主要积累在根部,降低了苋菜对铁、钾、钙、镁的吸收和向地上部分运输的速率而导致含量降低。更多还原

【Abstract】 Amaranthus tricolor seedlings were subjected to different Pb levels in soils during the whole experimental period.The parameters of growth and mineral elements contents were investigated.Excess Pb(0.4 mmol/kg) reduced the dry weight of leaves,stems and roots of Amaranthus tricolor plants pronouncedly with the maximum depression range in the roots.The inhibition effects of Pb on area expanding of the third and fourth mature leaf were stronger than on dry weight resulted in increases of leaf mass area(LMA).Excess Pb in the soils significantly promoted Pb accumulation in Amaranthus tricolor plants,moreover Pb was sequestered primarily in the roots.The ions(iron,potassium,calcium and magnesium) distribution in Amaranthus tricolor plants suggested that the uptake and the upward translocation of these ions could be reduced by Pb excess.更多还原