乔木层

tree layer的用法和样例：

例句

The community has an outstanding dominant species and the arborous layer possesses a comparatively high diversity index.群落的优势种显著，乔木层的物种多样性指数较高，各样地间的植物种类具有一定的相似性。
C. gigantea is a uni-predominant species in the arbor layer, microphyll and simple leaf hemicryptophytes are dominated in the shrub and grass layers.巨柏是乔木层的单优势种，灌木层和草本层以全缘草质小型单叶地面芽植物为主。

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