不同树干高度处的平均木材密度、纤维长度和纤维宽度存在显著差异。
The significant differences also existed in wood basic density, fiber length and fiber diameter at different tree height.
不同树干高度液流通量的变化受边材面积大小的影响，自基部沿树干高度递减；
Sap flow flux was influenced by sapwood area size, and decreased progressively from the base along the trunk to the top of tree.
这架飞机上的一个探测设备记录下它收到脉冲反向散射所需时间而且这个时间可用于计算到森林树冠层和到树冠层下土壤的距离，以此而计算出树干高度。
A sensor on the aircraft records the time it takes to receive the backscattering of pulses, and that is used to compute distances to the forest canopy and to the soil beneath.
不形成连续层的新生植物通常是森林中的巨人，高度可达35至70米或更高，树干直径超过2米。
Emergents, which do not form a continuous layer, are usually the giants of the forest, reaching heights of 35 to 70 m or more, and trunk sizes of over 2 m in diameter.
当然了，有那种天才设计师会将整个热带雨林降低些高度然后用多出的木材去填补树干的中断面吗？
Surely an intelligent designer would have put the rainforest canopy somewhat lower, and saved on tree trunks?
他还发现了一个平稳的地区之一树干的树木在肩的高度。
He also spotted a smooth area on the trunk of one the trees at about shoulder height.
判别因子分别是：个体的树高、胸径、胸高处皮厚、第一枯枝高和树干熏黑高度。
Factors involved in the model are: tree height. diameter at breast height. bark thickness at breast height. height of first dead branch and height of blackened trunk.
它们还依靠长长的爪子和高度灵活的踝关节在树与树之间攀爬，甚至还能像松鼠那样溜下树干。
The cat also relies on long claws and highly flexible ankles to scramble among the trees - and even shimmy down tree trunks like a squirrel .
判别因子包括个体的树高、胸径、胸高处皮厚、第一枯枝高和树干熏黑高度。
Factors involved in the model are tree height, DBH, bark thickness at breast height, height of first dead branch, and height of blackened trunk.
林分总生物量及树干生物量随高度分布呈金字塔型，枝、叶生物量主要集中分布在树冠中上部；
Vertical allocation of total biomass and trunk biomass showed a pyramid pattern, but that of branch and leaf biomass distributed mainly in the middle and upper part of the crown.
林分总生物量及树干生物量随高度分布呈金字塔型，枝、叶生物量主要集中分布在树冠中上部；
Vertical allocation of total biomass and trunk biomass showed a pyramid pattern, but that of branch and leaf biomass distributed mainly in the middle and upper part of the crown.
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