In physical and mechanical indexes, the basic density, air-dried density, compression strength parallel to grain, MOR, MOE and toughness of mature wood are higher than that of juvenile wood.
在物理力学性质指标中成熟材的基本密度、气干密度、顺纹抗压强度、抗弯强度、抗弯弹性模量及冲击韧性高于幼龄材；
Wood basic density and fiber morphological features in the breast-height position for512-year-old excellent clones of Populus tomentosa Carr. (1CK)were measured and analyzed in this paper.
对12年生5个毛白杨优良无性系（另1个作对照）胸高处木材的基本密度和纤维形态进行了测定分析。
The birches with a better growth and higher wood basic density which of the fiber traits and the wood chemical compositions was favorable to papermaking.
其白桦生长状况较好，木材基本密度较大，木材的纤维性状和化学成分含量最有利于造纸。
Within tree variation in wood basic density and cellulose content of poplar clones;
同时介绍了复合材料中树脂和纤维含量的确定方法。
Within tree variation in wood basic density and cellulose content of poplar clones;
同时介绍了复合材料中树脂和纤维含量的确定方法。
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