富营养化水体中蕹菜生理指标的变化研究

目的]探讨低氧水培对蕹菜生理特征的影响及蕹菜对低氧的耐受性特征。方法]采用浮床在低氧富营养化水面种植蕹菜,与土培的蕹菜进行比较,研究了成熟期蕹菜叶片中叶绿素、脯氨酸、丙二醛、可溶性糖和可溶性蛋白等生理指标的变化,探讨了蕹菜对低氧的耐受性特征及种植密度对蕹菜生长的影响。结果]在低氧富营养水体中,蕹菜叶片的总叶绿素、丙二醛、可溶性糖和可溶性蛋白含量低于土培处理,而脯氨酸含量高于土培处理,说明蕹菜对低氧富营养水体有较好的耐受性;种植密度越高,蕹菜的叶绿素含量越低,种植密度对叶片中脯氨酸和丙二醛含量影响不显著,高密度种植可提高可溶性蛋白的含量。结论]每2 m2的浮床种植66株蕹菜最佳,为蕹菜浮床的应用提供了理论依据。

Study on the Changes of Physiological Indexes of Water Spinach in Eutrophication Water

Objective] The effect of hypoxic hydroponics on physiological characteristics of water spinach and its hypoxia tolerance characteristics were studied.Method] Water spinach was planted in eutrophication water by means of floating bed,comparing with water spinach under soil culture,and the changes of physiological indexes(chlorophyll,proline,malondialdehyde,soluble sugar and soluble protein) in water spinach leaves at mature stage were researched,while the hypoxia tolerance characteristics of water spinach and the effect of plant density on water spinach growth were discussed in our paper.Result] In the hypoxic eutrophication water,the content of total chlorophyll,malondialdehyde,soluble sugar and soluble protein in water spinach leaves was lower than that of soil culture,with higher proline content,and the result showed that water spinach had better tolerance to hypoxic eutrophication water;the higher the plant density,the lower the chlorophyll content in water spinach leaves,and plant density had no significant influence on the content of proline and malondialdehyde,while soluble protein content was higher under high plant density.Conclusion] The best density of water spinach was 66 plants per floating bed with the area of 2 m2,which could provide theoretical basis for the application of water spinach in floating bed.