金沙江地区不同立地条件下3个树种树冠形态差异及原因分析

Difference and Cause Analysis of Crown Shape of Three Tree Species in Different Site Conditions of Jinsha River Region

选取金沙江地区具代表性的3个树种(酸角、黄葛榕和木棉)作为研究对象,分析了不同立地条件下酸角的偏冠现象和3个树种独立木的偏冠情况;探讨3个树种独立木的偏冠率与其树高、枝下高、地径和胸径之间的关联度。结果表明:①在6种不同立地条件下,酸角的平均偏冠率存在着一定的差异,其中坡地上的最大,独立木最小;②3个树种独立木的平均偏冠率有一定差异,其中酸角的偏冠率最大;③关联度分析结果,酸角的平均偏冠率与枝下高、黄葛裕的平均偏冠率与胸径、木棉的平均偏冠率与树高的关联性最强。

Three tree species, Tamarindus indica, Ficus virens var. sublanceolata, and Bombax mala- baricum, which are typical in the Jinshajiang area, have been selected for this study. This article ana-lyzed the phenomenon of crown inclination on different site conditions ; introduced the crown inclination of these three plants; and discussed the relational degree of those three independent tree between ratios of crow inclination （RCI）, tree height, low branch height, basal diameter, and diameter of breast height （DBH）. Results show that ： ①under six different site conditions, there are some differences with the av-erage crown inclination rate of Tamarindus indica, which the largest is on slope, while the independent tree is the least; ②the average crown inclination rate of 3 independent tree species have certain differ-ences, crown inclination rate of Tamarindus indica is the largest; ③ The results of the relational degree analysis show that, crown inclination rate of Tamarindus indica highly connect with low branch height, Ficus virens var. sublanceolata connect with DBH, and Bombax malabaricum connect with tree height.