太白红杉顶芽动态及其对分枝格局的影响

应用计盒维数方法比较研究了与太白红杉顶芽动态相关的不同分枝格局对空间占据能力的差异.结果表明，Ⅰ型分枝有利于对所拥有的空间进行有效填充和利用，Ⅱ型分枝有利于扩展枝条所占的面积，Ⅲ型分枝既扩展了面积，又实现了对所拥有空间的有效填充和利用.总的来讲，顶芽的死亡使分枝对空间的占据能力和对光能利用的效率有所提高，同时对植株冠型的调整也有重要作用.太白红杉枝条顶芽的死亡是外界严酷环境条件的被迫“产物”.

Fate of Larix chinensis apex buds and its influence on branching pattern

Using box-counting dimension method, this paper investigated the spatial occupation ability of different branching patterns related to the fate of Larix chinensis apex buds. The results showed that typeⅠbranching was beneficial to the branches to extend their spatial occupation, typeⅡbranching was beneficial to spread their areas, and type Ⅲ branching was beneficial both to extend their spatial occupation and to spread their areas. As a whole, the death of apex buds could help branches to improve their spatial occupation ability and energy utilization efficiency, and play an important role in adjusting crown type, and hence, in improving its photosynthesis. The death of Larix chinensis apex buds was probably a compelled result of their rigorous living conditions.