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；
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.
抗弯刚度的概念是材料切线模量和截面对中和轴的惯性矩的乘积。
The bending stiffness of elastoplastic member is product of tangent elastic modulus of material and inertia moment of the section.
杨氏弹性模量是反映树干或板材抗弯、抗压强度的重要指标，是开展林木材质育种研究的重要内容。
MOE reflects log or lumber material anti-bend, important index of the anti-press strength, which is the important contents for developing forest wood breeding.
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