3种杜鹃光合特性的比较  

Photosynthetic Characteristics of Three Rhododendron Cultivars

作　　者：张华[1] 谢利娟[1] 白宇清[2] 王定跃[3] 

机构地区：[1]深圳职业技术学院,深圳518055 [2]中国农业大学 [3]深圳梧桐山风景区管理处

出　　处：《东北林业大学学报》2012年第5期59-61,79,共4页Journal of Northeast Forestry University

基　　金：深圳市城市管理局科技基金项目(SZCG200706)

摘　　要：为了利用杜鹃花的生理生态特性高效率地建设深圳梧桐山风景区的"十里杜鹃"景点,研究了该景区引种栽培的毛棉杜鹃、华丽杜鹃、映山红的光合特性参数。结果表明:毛棉杜鹃的净光合速率(Pn)为双峰曲线,出现光合"午休"现象;华丽杜鹃和映山红的Pn是单峰曲线。净光合速率的日均值由大到小的顺序为:毛棉杜鹃、华丽杜鹃、映山红。3种杜鹃的蒸腾速率(Tr)均为单峰曲线,华丽杜鹃的蒸腾速率(Tr)、气孔导度(Gs)和胞间CO2摩尔分数显著高于毛棉杜鹃和映山红。在水分利用率和光能利用率方面,毛棉杜鹃显著高于华丽杜鹃和映山红。因此,毛棉杜鹃可作为上述景点建设的优先选择种。Diurnal changes in photosynthetic characteristics ot the leaves ot Rhododendron moulmainense Hook.f. ,R. eudoxum BaIL f. et Forrest and R. sirnsii Planch. were measured with the aid of Li-6400 portable photosynthesis system. Result showed that the net photosynthetic rate of R. moulmainense presented a double-peak curve with a midday depression; while that of R. eudoxum and R. simsii both exhibited a single-peak curve. Moreover, the average net photosynthetic rate of R. moulmainense was the highest, followed by R. eudoxum and R. simsii. The transpiration rate of all the Rhododendron cuhi- vars appeared a single-peak curve. The transpiration rate, stomatal conductance, and intercellular C02 concentration of R. eudoxum were markedly higher than those of the other cuhivars. However, the water use efficiency and light use efficiency of R. moulmainense was the highest. In conclusion, R. moulmainense is the best cultivar for the construction of scenic spots due to its high net photosynthetic rate, water use efficiency, and light use efficiency.

关 键 词：毛棉杜鹃 华丽杜鹃 映山红 光合特性 相关分析 

分 类 号：S685.21[农业科学—观赏园艺] Q945.11[农业科学—园艺学]