关键词: 河西走廊, 河西走廊, 干旱, 干旱指标, 干旱等级, 适用性

Abstract: Leafy vegetables were susceptible by heavy metal cadmium pollution, a kind of leafy vegetables was chosen to adapt to the potential cadmium pollution area and could reduce ecological risks and improve food safety in this experiment. [Method]The effects of different cadmium pollution on the growth and development of three kinds of vegetables and their distribution in soil-vegetable system were studied by pot experiment. The tolerance and cumulative situation of cadmium to different vegetables was compared. [Result]The results indicated that: The pakchoi and lettuce showed higher plant height and fresh weight at lower Cd concentration. Under high Cd concentration, the biomass of two kinds of vegetables decreased rapidly with the increase of cadmium concentration. The resistance to cadmium stress of spinach was worst in three kind vegetables. With the increase of cadmium concentration, the growth of the spinach reduced and all of that were death at 50 mg/kg cadmium concentration. Cadmium stress stimulated the increase of chlorophyll content in pakchoi, and the same to lettuce under low concentration of cadmium stress, and there was no significant difference under high concentration for lettuce. The chlorophyll of spinach reduced with the increase of cadmium concentration. The order of Cd accumulation ability for root, stem and leaf of three kind vegetables was: pakchoi