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。
The results indicated that the solar radiation intensity under the rubber crown canopy was reduced along with the intercropping layer added.
结果表明，随着林内层次的增加，林内太阳辐射量急剧减少；
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