arborous

Intermediate cutting can not improve the biomass of arborous layer on unit area in a short period.

短期内，间伐不能够提高林分乔木层单位面积的生物量。

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At the beginning of the late Early Pleistocene, pollen of arborous plants was rapidly reduced and even all disappeared, and pollen of herbaceous plants increased significantly.

进入早更新世晚期初，乔木植物花粉迅速减少乃至全部消失，草本植物花粉大幅度增加。

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Pteroceltis tatarinowii, one of dominant species of arborous layer had important value ( 66%).

青檀是乔木层优势树种之一，其重要值达66%。

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Species distributed evenly and Richness of species was great when the density closure of broadleaved stands was 0.6~( 0.7) and density closure of needle-leaved stands was 0.7~ 0.8, plants of arborous, shrub, and herbal layers grew well.

阔叶林在郁闭度0.6～0.7，针叶林在0.7～0.8时各物种分布均匀，物种丰富度较大，乔、灌、草各层生长状况良好。

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The community can be structurally divided into arborous layer, shrub layer and herbaceous layer.

群落可分为乔木层、灌木层、草本层和层间层。

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Russian nature conservation region consists of following protected units: national nature reserve, national and local hunting preserves, national park, nature park, nature remnant, arboretum, arborous park, sanatorium, medical treatment and health care sites.

俄罗斯特别自然保护区域包括国家级自然保护区、全国和地方性的国家自然禁猎区、国家公园、自然公园、自然遗迹地、植物园、树木公园、疗养院、医疗保健地等特别自然保护区域。

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The diversity dynamics of arborous species of different layer during the 28 years restoration period have complexity.

林分不同层内乔木树种的多样性变化动态较复杂。

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Among them the arborous layer is 956.25g/ m~ 2 · a; the grass layer and naturally seedlings are 161.10g/ m~ 2 · a;

其中乔木层为956.26g/m~2·a，草本及天然幼苗为161.10g/m~2·a。

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The result of factor analysis shows: the relatedness exists between structure factors of plant community, four factors contain 85% of information content: canopy, average high of arborous layer, density of arborous layer and underbrush character.

因子分析表明群落结构各因子间存在着相关性，其信息量的82.5%集中在四个主因子上，即：冠盖因子、乔木层高、灌木层性状及乔木层密度因子。

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