The tall erect trunks of closely spaced forest trees and branch configurations shaped to admit light are two of the more obvious adaptive responses of trees to forest conditions.

• 不难发现，生长间距紧密的林木其树干笔直而高耸，枝叶亦形成向上伸展的构形以争取阳光，这是树木适应森林环境而发展出的两项较为明显的特性。