upper tree layer 高树层
lower tree layer 低树层
dominant tree layer 优势木层
tree-layer 乔木层
the tree layer 乔木层
tree layer coverage 乔木层盖度
Tree layer structure 乔木层结构
Tree layer coverage is one of the primary numerical characteristics of forest community.
乔木层盖度是森林群落的主要数量特征之一。
The mean ash content increased in an order from tree layer, shrub layer to herb layer, while those of GCV and AFCV decreased.
从乔木层、灌木层到草本层，灰分含量依次增加，GCV和AFCV则依次降低。
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.
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。
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