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为研究热带园林植物在温室环境下的光合及蒸腾作用,对重庆南山植物园热带温室环境条件下,苏铁蕨、象腿芭蕉、酒瓶椰子、琴叶榕、人心果和海南龙血树6种植物的光合效率、蒸腾效率及水分利用效率进行了测定,结果表明:(1)几种热带园林植物都有明显的光合速率日变化,部分树种存在因气孔导度下降而引起的“午休”现象.(2)植物的光合速率大小与植物叶绿素含量无直接相关.(3)6树种光合速率从大到小依次为:人心果,龙血树,象腿芭蕉,酒瓶椰子,苏铁蕨,琴叶榕;蒸腾速率从大到小依次为:龙血树,琴叶榕,象腿芭蕉,苏铁蕨,人心果,酒瓶椰子;水分利用效率从高到低依次为:人心果,象腿芭蕉,龙血树,琴叶榕,酒瓶椰子,苏铁蕨.
In order to study the photosynthesis and transpiration of tropical garden plants in a greenhouse environment, we studied the effects of Cyperus rotundus, Balsam pear, Bottle coconut, Ficus carici, Nocardiography and Six species of Dracaena fortunei on tropical greenhouse environment in Chongqing Nanshan Botanical Garden. Photosynthetic efficiency, transpiration efficiency and water use efficiency were measured. The results showed that: (1) There were obvious diurnal changes of photosynthetic rate in some tropical garden plants, and the phenomenon of “lunch break” caused by the decrease of stomatal conductance in some species . (2) There was no direct correlation between the photosynthetic rate of plant and chlorophyll content of plants. (3) The photosynthetic rate of 6 tree species in descending order were: human heart fruit, dracaena, banana plantain, wine cork, cycad, The highest transpiration rate was descending order: dracaena, fig leaf, banana plantain, cycad fern, human heart fruit, wine bottle coconut; water use efficiency from high to low were as follows: Blood Tree, Ficus leaves, bottle coconut, cycad fern.