毛乌素沙地旱柳生长和生理特征对遮荫的反应

在一个控制试验中，旱柳经历了全不遮荫、部分遮荫和全部遮荫处理．比较了全不遮荫枝、全部遮荫枝、部分遮荫阳生枝(阳生枝)和部分遮荫阴生枝(阴生枝)的生长和生理特征，结果表明：阳生枝和全部遮荫枝的叶出生率和死亡率分别大于全不遮荫枝和阴生枝；遮荫处理明显影响净光合速率和夜间呼吸速率；阳生枝的分枝生物量、总校长度、枝叶生物量和枝叶重比显著大于全不遮荫枝，而阴生枝的分枝数、分枝生物量、叶面积、叶生物量、基茎、总校长度、枝叶生物量和枝叶重比都显著小于全部遮荫枝．

Growth and physiological features of Salix matsudana on the Mu Us Sandland in response to shading

In a pot experiment, Salix matsudana was subjected to the unshaded, partial shading and shading treatments.The growth and physiological features of its branches were compared under contrasting light environments (i.e., the branches of entirely grew under unshaded condition (Bhh), entirely grew under shading condition (Bll), grew under unshaded condition and connected to different branches under shading condition (Bhl), and grew under shading condition and connected to different branches under unshaded condition (Blh)). The results showed that the leaf natality and mortality were higher in Bhl and Bll than in Bhh and Blh, respectively. Shading had significant effects on net photosynthesis and night respiration rates of four types of branches. The branch biomass, total branch length, shoot biomass and shoot weight ratio were higher in Bhl than in Bhh, and conversely, the number of branches, branch biomass, leaf area, leaf biomass, basal diameter, total branch length, shoot biomass and shoot weight ratio were smaller in Blh than in Bll.