施用锌肥对水稻吸收不同污染水平土壤中镉的影响

Effect of Zinc Fertilizer Application on Cadmium Uptake by Rice Plants Grown in Soils Polluted by Different Levels of Cadmium

通过田间小区试验研究了3种镉污染水平土壤上施用锌肥对水稻植株镉积累的影响。结果表明:叶面喷施锌肥能抑制水稻籽粒中镉的积累,在轻度、中度和重度镉污染的土壤上叶面喷施锌肥后水稻籽粒中镉含量分别比对照(不施锌肥)降低了25.93%、20.51%和16.17%;土施锌肥对轻、中度污染土壤上生长的水稻籽粒中镉积累有明显的抑制作用,分别比对照下降了37.04%和28.21%,但在重度污染土壤中土施锌肥增加了水稻籽粒中镉的积累,比对照增加了13.23%。

A field plot experiment was conducted to study the effects of zinc fertilizer application on the cadmium（ Cd） accumulation in rice plants grown in the soils which were polluted by three different levels of Cd. The results showed that the foliar spraying application of zinc fertilizer reduced the Cd content in rice grains grown in the slightly-polluted,moderately-polluted and heavily-polluted soils by 25.93%,20.51% and 16.17% respectively as compared with the control（ without zinc fertilizer application）. The soil application of zinc fertilize also had obvious inhibiting effects on the Cd accumulation in rice grains grown in the slightly-polluted and moderately-polluted soils,which was separately 37.04% and 28.21% lower than that of the control. However,the soil application of zinc fertilize increased the Cd accumulation in rice grains grown in the heavily-Cd-polluted soil by13.23% in comparison with the control.