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。
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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