云锦杜鹃的顶芽动态和构型演变

Dynamics of Apical Buds and Architecture Change of Rhododendron fortunei

通过对云锦杜鹃顶芽动态的调查及不同发育阶段的植冠构型分析,结果显示:云锦杜鹃的顶芽可分化为营养枝或花芽,而侧芽通常为枝芽,并保持休眠状态;植冠构型转变主要表现在分枝格局上,其中枝长与分枝率的交换最为突出:在幼苗阶段,高生长显著,枝条伸长快,但分枝率低;幼树阶段,高生长仍较为显著,同时冠幅迅速扩展,分枝率增至最大;成株阶段,高生长显著降低,冠幅扩展放慢,分枝率也显著降低。另外,在个体发育过程,云锦杜鹃的枝倾角和叶倾角等性状都发生过显著变化,表明这些性状间存在着生态相关性。

Dynamic investigation on apical buds of Rhododendronfortunei at Tiantai Mountainous area, Zhejiang province, and architecture analysis on crown showed that apical buds could form foliage branch or flower bud, while lateral buds form usually limb buds with dormant state. Crown geometry could be found by branching pattern, especially trade-off of branching ratio and branch length. At seedling stage, it had characters such as quick height growth and fast branch elongation growth but low branching rate. At sapling stage, it had same quick height growth, rapid crown formation, the highest rate of branching. At mature stage, crown expansion and height growth slowed down, and branching rate decreased. In addition, branch angle and leaf angle of R. fortunei significantly changed during growth, indicating they had ecological correlation.