西南桦人工林木材物理力学性质变化规律  

Variation Trend of Physical and Mechanical Properties of Wood in Betula alnoides Plantation

作　　者：赵毅力[1] 刘彬 夏炎[1] 

机构地区：[1]西南林业大学,云南昆明650224 [2]南京市产品质量监督检验院,江苏南京210028

出　　处：《广西林业科学》2015年第2期137-140,共4页Guangxi Forestry Science

基　　金：国家自然科学基金地区科学基金项目(31360157);西南林业大学重点科研基金项目:西南桦人工林材性变异特性的研究

摘　　要：对西南桦(Betula alnoides)木材气干密度、静曲强度、弹性模量、顺纹抗压强度进行了测试,结果表明:气干密度在轴向上大体呈V字型的生长变化趋势。力学强度在径向上大体呈V字型的生长变化趋势,即在髓心处为最小值,经髓心沿南北两个方向分别随着树龄的增加而增大。在轴向上,取样地1的西南桦木材力学强度较为均匀,取样地2的西南桦木材力学强度波动较大,呈下降再上升的趋势。经方差分析,两个取样地间西南桦木材物理力学性能没有显著性的差异。The air-dry density, MOR, MOE, and compression strength parallel to grain of Betula alnoides wood were tested. The results showed that along axial direction, the air-dry density showed V shaped growth trend. The mechanical strength along the radial direction showed V shaped trend too, with the minimum in the pith increasing with the increase of age. Along axial direction, the mechanical strength of the wood was uniform in the first sampling area but varied in the second sampling area with increasing after decreasing. No significant differences between the two samples in the physical and mechanical properties were proved by variance analysis.

关 键 词：西南桦 气干密度 力学强度 生长变化 

分 类 号：S781.3[农业科学—木材科学与技术]