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 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。
The abundance index of the five type green space in tree layer was community park (6.3) >general park (4.5) >town park (4.3) >special park (3.9) >coiled park (3.8).
在这五种类型的公园绿地中，乔木层的物种丰富度表现为社区公园（6.3）>综合性公园（4.5）>街旁绿地（4.3）>专类公园（3.9）>带状公园（3.8）；
The GCV and ash-free caloric value (AFCV) decreased in the following order: lianas, tree layer 1, tree layer 2, shrub layer and herb layer. The AFCV differed among various components.
各层优势种平均干重热值和去灰分热值都表现为：层间藤本>乔木1层>乔木2层>灌木层>草本层。
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。
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。
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