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.
通过分析平面绿量效率这一指标，客观地说明了一些具有高叶面积指数、冠幅较大速生落叶大乔木应是遮荫树主体。
By analyzing the efficiency of LVV_H, it objectively illustrated that the tree with lager crown and higher LAI was the preference for shading.
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