灌木层中乔木树种和阳性乔灌木种类比例、相对密度和重要值均随坡位梯度从下部到上部逐渐增大。
Percentage, relative density and importance values of tree species and intolerant tree and shrub species increased while slope gradient from lower to upper.
群落中光照的分布状况受乔木层的种类组成、密度与冠幅指数等因子的影响，且对下层植物分布有较大的作用。
The species component, density and index of crown cover in the tree layer effect on distribution of illumination and under plants in the plant community.
任一种新鲜的或陈旧的易碎、芳香、呈黄色到红色的树脂，可从各种热带乔木中提取，用于某些清漆中。
Any of several brittle, aromatic, yellow to red resins of recent or fossil origin, obtained from various tropical trees and used in certain varnishes.
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