林下套种对南方红豆杉树冠形态结构及干形变化的影响

The Effect of Interplant Under the Canopy on Taxus chinensis var. mairei Crown Structure and Stem Form Changes

为实现南方红豆杉高效培育,以福建明溪林下套种与纯林模式培育的15年生红豆杉林分为研究对象,对其树冠结构特征、侧枝垂直分布规律、枝长与枝径生长关系进行分析研究。结果表明:培育模式对南方红豆杉树冠结构特征有显著影响;不同模式的南方红豆杉侧枝垂直分布、枝长与枝径生长及冠内干形变化差异显著;林下套种模式的南方红豆杉形成有利于截获光照、光合能力较强的宽大、圆满的圆锥形树冠,侧枝数量较小,冠内干形圆满,利于节少、节稀且圆满的干材形成,是其林分速生、优良干材形成的重要因素。培育模式对南方红豆杉枝长、枝径生长影响显著。

In order to realize the efficient cultivation of Taxus chinensis var. mairei, the crown structure char- acteristics, vertical distribution of branches and growth relationship between branch length and branch diameter of the interplant under the canopy pattern and the pure forest cultivation pattern cultivated 15 years Taxus chinensis vat. mairei stands were studied in Mingxi, Fujian. The results showed that cultivation patterns had significant effects on the crown structure Taxus chinensis var. mairei vertical distribution of branches, growth relationship between branch length and branch diameter and stem form changes in crown had significant difference in different cultivation patterns. With the interplant under the canopy pattern, most trees of T. chinensis var. mairei were available to form the absorption ability of sunlight and the higher photosynthetic with wide and long conical-shaped crown. The smal- ler first lateral branch number and more full stem form in crown were contributed to cultivate lesser and rarer knot full stem. There were the important factors of fast-growing and excellent timber for the forest regeneration pattern of T. chinensis var. mairei. Cultivation patterns had significant effects on the growth of branch length and branch diam- eter of T. chinensis vat. mairei.