摘要
对延吉市帽儿山不同林分密度的人工林赤松(Pinus densiflora)的物理力学性质差异进行研究。结果表明:2个不同林分密度材绝干密度平均值相同;弦向、径向和纵向干缩率,林分密度相对低的林分人工林赤松大于林分密度相对高的林分人工林赤松;抗弯强度、抗弯弹性模量、顺纹抗拉和抗压强度、横纹弦向和径向抗压强度,林分密度相对低的林分人工林赤松要高于林分密度相对高的林分人工林赤松;弦面和径面抗剪强度,林分密度相对低的林分人工林赤松低于林分密度相对高的林分人工林赤松;2个不同林分密度人工林赤松的径向干缩率、抗弯弹性模量、顺纹抗压强度、横纹弦向和径向抗压强度差异达0.01显著水平,抗弯强度差异达0.05显著水平,绝干密度、弦向干缩率、纵向干缩率、顺纹抗拉强度无显著差异。
An experiment was conducted to study the differences in physico-mechanical characteristics of Pinus densiflora plantations of different stand densities in Maoer Mountain of Yanji City were studied. Results showed that the oven-dry densities of wood samples from two different stands exhibited the same average value. The tangential shrinkage rate, radial shrinkage rate, and longitudinal shrinkage of P. densiflora wood from the stand with low density were higher than those from the stand with high density. The modulus of rupture （MOR） , modulus of elasticity （MOE） , tensile strength parallel to grain, compressive strength parallel to grain, tangential compression strength perpendicular to grain, and radial compression strength perpendicular to grain of P. densiflora wood from the stand with low density were also higher than those from the stand with high density. The shearing strength in tangential face and shearing strength in radial face of P. densiflora wood from the stand with low density were lower than those from the stand with high density. The differences in radial shrinkage rate, MOE, compressive strength parallel to grain, tangential compression strength perpendicular to grain, and radial compression strength perpendicular to grain of P. densiflora wood from the two stands of different densities reached the 0.01 level of significance, and MOR reached the 0.05 level of significance. No significant differences were observed between the two stands in oven-dry density, tangential shrinkage rate, longitudinal shrinkage, and tensile strength parallel to grain.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2009年第12期20-21,29,共3页
Journal of Northeast Forestry University
基金
国家自然科学基金资助项目(30060070)
关键词
赤松
林分
人工林
物理力学性质
Pinus densiflora
Stands
Juvenile wood
Physieo-mechanical properties
