云南红豆杉人工药用原料林春芽数量及其动态

Spring Bud Number and Dynamic of the Planted Pharmaceutical Raw Material Forest of Taxus yunnanensis

芽是枝、花或花序尚未发育前的雏体,是植物体的重要构件之一,也是植物树冠形成的基础（魏媛等,2010）.芽的萌发预示着冬眠结束和生长开始（Yakovlev et al.,2008）,并影响着许多过程,以及各种动物行为（Wesolowski et al.,2006）.因此,乔木芽萌发、芽的时空变化以及这些变化的机制,对于理解乔木的许多季节现象非常重要,对于制定物种管理方法（Akamine et al.,2007）及探讨森林对气候变化的响应也具有重要价值（Wesolowski et al.,2006;Rohde et al.,2011）.植株树冠的形成,很大程度上取决于芽在植物上的着生位置、排列和活动状况.

In order to understand spring bud dynamic of Taxus yunnanensis and the influencing factors,we investigated the living and dead numbers of spring buds at February,April and June.The results showed that the spring bud number of T.yunnanensis ranged from 3 to 29 per each individual,and the coefficient of variation was 42.93％.The number and density of spring buds in the upper crown was greater and higher than those in the lower crown.The spring bud number in the east of crown was smaller than that in the west of crown,while the spring bud density in the east of crown was lower than in the north of crown.The number of spring buds was highest in February.Likewise,dead spring buds and mortality were also most and highest in February and declined with time.The correlation analysis indicated the twig size and leaf number affected spring bud number.Basal diameter,top diameter and length of twig and leaf number were positively related to spring bud number.