4个椰子品种光合、蒸腾作用日变化特征及影响因素

Daily Changes of Photosynthesis and Transpiration Rate of Four Cultivars of Coconut and the Influencing Factors

以结果盛期的黄矮椰子﹑香水椰子﹑本地高种椰子﹑文椰78F1 4个椰子品种为研究对象,对椰子叶片的光合作用﹑蒸腾作用的日变化规律及温度﹑湿度﹑光合有效辐射和CO2浓度等环境因子之间的互作进行研究。结果表明,不同椰子品种的光合速率和蒸腾速率日进程表现为明显的双峰型日变化,本地高种椰子的光合速率和蒸腾速率都比较高,香水椰子和文椰78F1居中,黄矮椰子最低。光合有效辐射、叶片温度对椰子光合速率有重要影响,空气湿度和叶片温度是影响蒸腾速率的重要环境因子。

Yellow Dwarf Coconut,Aromatic Dwarf Coconut,Hainan Tall Coconut and Wenye 78F1 at the stage of active fruiting were used as the research materials.The daily changes of transpiration rate,net photosynthesis rate and the interaction of influencing factors as temperature,humidity,intensity of illumination,CO2 concentration were studied.The result revealed that the net photosynthesis rate and transpiration rate of different varieties were with similar two-peak changing tendency,Hainan Tall Coconut with higher transpiration rate and net photosynthesis rate than Aromatic Dwarf Coconut and Wenye 78F1,Yellow Dwarf Coconut with the lowest values compared to the others.The correlation analysis revealed that the net photosynthesis rate was mainly influenced by the intensity of illumination and leaf temperature.Air humidity and leaf temperature were the main factors that affected the transpiration rate.