英德
有道
百度
谷歌
图片
维基
百科
乔木层
arborous layer
tree layer
tree layer
- 群落乔木层物种多样性、均匀度在增加，生态优势度在降低，群落向着复杂化、 多层化方向发展。
The species diversity and evenness of tree layer were increased, the ecological dominance was decreased, and the community became more complicated. - 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. - 对各样方的高度级、径级进行统计分析，群落乔木层建成初期林木生长较快，其他时期，各级数量所占比例变化并不明显；
Height structure and diameter structure of tree layers of communities are studied, the results show that the amounts of each levels do not change evidently other than during the prophase period.
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