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中文摘要：
为了研究弱光环境对林下红桦幼苗光合生理的影响,进行了30±2.5%遮荫处理,并对7月份川西亚高山红桦（Betula albosinensis）幼苗光合以及荧光参数进行了测定。结果表明：随着光照强度的降低,红桦幼苗叶片光补偿点、光饱和点、CO2补偿点、CO2饱和点、光合色素含量以及羧化效率（CE）均上升;对照和遮荫条件下,核酮糖-1,5-二磷酸羧化酶（rubisco）活性分别为0.203和0.177 μmol·mL^-1·min^-1。遮荫处理的ψPSⅡ、Fv/Fm的日变化比较平稳而且维持在一个较高的水平,而且其Fo、ψPSⅡ、Fv/Fm值均高于对照.这些现象表明,川西亚高山地区夏季的强光环境对红桦幼苗的光合作用具有一定的负效应,但对林下的幼苗光合与生长却是有利的。红桦幼苗是该地区暗针叶林演替初期的先锋树种和林下植被恢复过程中的主要树种,本结果对进一步研究该地区林地的生态恢复具有重要参考价值。
英文摘要：
Traits of photosynthesis and chlorophyll fluorescence of red birch seedlings （Betula albosinensis） were investigated under a 30 ± 2.5% of shading, in July, in subalpine area, western China. The results showed The light compensation point, light saturation point, CO2 compensation point, light saturation point, carboxy that： lation efficiency and the content of photosynthetic pigments were enhanced with the decrease of light intensity ; The enzymatic activity of rubisco were 0. 203 and 0. 177μmol NADH·mL^-1·min^-1 under high and low light intensity, respectively. The dynamic diurnal variation of φPSⅡ and Fv/Fm of leaf from the treatment of low light intensity were steadily kept at a high level and the Fo, φPSⅡ, Fv/Fm of shaded treatment were higher than those of control. These results suggested that the effects of the high light surroundings of the subalpine area in western China was negative on photosynthesis of red birch seedlings, whereas the seedlings beneath the forest crown will be benefited. Sine red birch seedling was the pioneer tree species at the initial stage of the succession of the dark forest and the main tree species in the process of the vegetative recovery, the results will be an important reference for further research on the ecological recovery of the forest in subalpine area of western China.
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