The abundance index of the tree layer was higher than the shrub layer.
郑州市不同类型公园绿地乔木物种丰富度稍大于灌木。
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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