乔木层株数随胸径分布呈现截尾正态分布。
Diameter distribution of tree stratum reveals truncated normal distribution.
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.
群落可分为乔木层、灌木层、草本层和层间层。
The community can be structurally divided into arborous layer, shrub layer and herbaceous layer.
乔木层生物量中干材生物量最大，其次为根系、树枝和树叶。
Trunk biomass was the highest in the arbor biomass and root, branch and leaf came to the next.
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 mean ash content increased in an order from tree layer, shrub layer to herb layer, while those of GCV and AFCV decreased.
影响斑块大小、形状的主要因素为斑块上方草本层盖度，但乔木层盖度可能影响到苔藓斑块的质量。
Herb cover and arbor cover maybe the main factors influenced patch size and patch shape, and the arbor cover maybe influenced quality of the patch.
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.
为提高城市隔离片林生态效益及景观面貌，片林结构除简单的乔木层外，还应具有一定面积的复层混交种植结构。
Besides the simple arbor layer, the multilayer plantation structure should be adopted in order to enhance the ecological benefits and scene values of isolating greenbelts in Beijing.
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 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).
最后一层是实际装配的乔木。
通过对废弃采石场以及裸岩山地自然植被的调查，结果表明，宁波市石宕及裸岩的主要有乔木树种有20种，灌木树种30种，草本11种，层外植物6种。
Investigation on natural vegetation at open pit and bare rock in Shitang, Ningbo demonstrated that there are 20 tree species, 30 shrub species, 11 herb species and 6 extrasturatum plants.
形态特征：为高大的落叶乔木，成年树的树皮有发达的木栓层。
Configuration feature: For lofty deciduous leaf arbor, the bark of grown tree has the phellem layer that develop.
最后一层是实际装配的乔木。
灌木层中乔木树种和阳性乔灌木种类比例、相对密度和重要值均随坡位梯度从下部到上部逐渐增大。
Percentage, relative density and importance values of tree species and intolerant tree and shrub species increased while slope gradient from lower to upper.
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。
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.
结果表明：（1 ）影响乔木、灌木和草本层植被格局变化的首要因子都是地形特征；
The results are as following: (1)The topographic characteristics are critical for the spatial variations of vegetation.
结果表明：（1 ）影响乔木、灌木和草本层植被格局变化的首要因子都是地形特征；
The results are as following: (1)The topographic characteristics are critical for the spatial variations of vegetation.
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