摘要： 为研究氮水平对断氮处理提高水培生菜营养品质效果的影响,以揭示氮营养条件影响断氮处理效果的机理,在玻璃温室中,以2种氮水平10,15 mmol/L水培紫叶生菜,并在生菜生长后期以KCl溶液进行5 d断氮处理.断氮处理前后,生菜生物量没有显著变化.生菜抗坏血酸、可溶性糖含量在断氮处理后都显著提高了,叶片和叶柄硝酸盐含量则显著降低.断氮处理前后,生菜地上部酚类物质相对含量受氮水平影响都不显著.断氮处理对生菜生物量影响不显著,但显著提高了生菜营养品质.氮水平显著影响了生菜抗坏血酸含量变化速率,氮水平降低,抗坏血酸增加速率显著提高.

关键词: 断氮, 氮水平, 生菜, 品质, 水培

Abstract: To analyze the effects of nitrogen level on nitrogen-free hydroponic solutions effectiveness and reveal the mechanism how nitrogen condition effect nitrogen-free hydroponic solutions effectiveness on lettuce.Purple lettuce was grown hydroponically under nitrogen level 10,15 mmol/L respectively,then cultivated with KCl solution for five days before harvest.The results showed that nitrogen-disruption treatment didn't change the biomass remarkably.The phenols relative contents didn't change significantly with the reducing of nitrogen levels before and after nitrogen-disruption treatment.And the contents of ascorbic acid and soluble sugar improved significantly and the nitrate contents of leaves and leaf blades dropped greatly after treated by nitrogen-disruption.The nitrogen-disruption treatment improved the nutritional quality of the lettuce strikingly without reducing production.And the ascorbic acid content increasing speed was effected by nitrogen level greatly,it enhanced significantly as the nitrogen level reduced.

Key words: Nitrogen-free, Nitrogen level, Lettuce, Quality, Hydroponic

中图分类号: 

• S143.1