关键词: 地下滴灌, 地下滴灌, 韭菜, 根系分布

Abstract: The effects of Cd2＋on Dwarf beans seed germination and seedling growth were studied with water culture experiments. The results showed that when the concentration of Cd2＋at low level, the effects of Cd2＋on the seed germination and seedling growth were not significant. Seeds germination were activated at a certain extent when Cd2＋ concentration ranged from 0.05mg/L to 0.5 mg/L concentrations. The roots and Hypocotyls of seedling exhibited a significant decrease in growth at higher level of Cd2＋concentrations（5～100mg/L）.The activities of peroxidase（POD）, superoxide dismutase（SOD）, catalase（CAT）could be enhanced at low Cd2＋concentrations but inhibited at higher concentration. The activities of POD, CAT were more inhibited in roots than in Hypocotyls at the same Cd2＋concentrations, while that of SOD was higher in roots than in Hypocotyls when the concentration of Cd2＋ was more than 0.5mg/L. The malondialdehyde(MDA) contents were continuously increased with Cadmium exposure in both roots and Hypocotyls.