【摘要】 以东北林业大学帽儿山实验林场老山实验站的人工兴安落叶松林为例．对３种不同初植密度 Ｌ２１（１． ５ ｍ × ２． ０ｍ）、 Ｌ２２（３． ０ ｍ × ３． ０ ｍ）、 Ｌ２３（２． ５ ｍ× ２． ５ ｍ）林分的人工落叶松木材物理力学性质性向变异进行比较研 究。结果表明：①生长速率．晚材率、以及气干时径向、弦向和体积干缩率均表现为：Ｌ２３＞Ｌ２１＞Ｌ２２；全干时径 向、弦向和体积干缩率均表现为：Ｌ２３＞Ｌ２２＞Ｌ２１。②生长速率、生长轮宽度、晚材率３项指标差异不显著、生长 轮密度和干缩率则表现为差异十分显著。③力学性质指标中．抗弯强度、顺纹抗压强度、横纹局部抗压和横纹全部抗 压强度差异显著．而且抗弯弹性模量、顺纹抗压强度、横纹局部抗压和横纹全部抗压强度的平均值表现为： Ｌ２３＞Ｌ２２ ＞Ｌ２１。采用综合坐标法分析．Ｌ２３林分树木生长速度较快．晚材比重大．主要力学性质好．木材材质较好．更多还原

【Abstract】 This paper compared the physical mechanics property of larch wood in different planting densities. The results showed that there are great effects on tile physical mechanics property of larch plantation. Some physical mechanics of larch such as the growth rate and late wood percentage show L23>L21 >L22. when dry-through. rate drying shrinkage along the grain and across tile grain and volume drying shrinkage rate show L23 >L22 >L21. The differences of growth rate. growth-ring width and late-wood rate are not signific ant. and those of growth-ring density and drying shrinkage rate are signiticant. The differences of mechanics properties. such as bending strength. crushing strength along tile grain. overall or local crushing strength across the grain. are considerable. and crushing strength along tile grain. bending rigidity modulus. overall or local crushing strength across the grain show L23 >L22>L21. Therefore proper planting density such as L23 would improve wood mechanics properties and accelerate the tree growth as well.更多还原