间伐对油松木材密度与力学性能的影响  

Effects of Thinning on the Density and Mechanical Properties of Pinus tabuliformis

作　　者：程利娟 王梦蕾 孙照斌[2] CHENG Lijuan;WANG Menglei;SUN Zhaobin(Shibalitai Forestry Centre of Hebei State-owned Forest Farm Management Office,Hebei Longhua 068150;The Faculty of Forestry,Hebei Agricultural University,Hebei Baoding 071000)

机构地区：[1]隆化国有林场管理处十八里汰林场,河北隆化068150 [2]河北农业大学林学院,河北保定071000

出　　处：《林业科技》2023年第5期14-17,共4页Forestry Science & Technology

摘　　要：选取冀北山区油松人工林为研究对象,按照国家标准测定间伐油松木材的密度与力学性能指标,并进行相关性分析。结果表明:1)间伐与未间伐油松的树干下部木材密度和力学性能均高于上部木材。2)间伐油松的气干密度、绝干密度和基本密度均高于非间伐油松,间伐和非间伐油松基本密度分别为0.45 g/cm^(3)、0.42 g/cm^(3)。3)间伐油松各项力学指标(包括抗弯强度、抗弯弹性模量、顺纹抗压强度、横纹全部抗压强度、横纹局部抗压强度、硬度)均大于未间伐。4)间伐与未间伐油松的基本密度与抗弯强度、横纹局部抗压强度相关性较大,与其他指标相关性较小。The density and mechanical properties of tabulacrum wood before and after thinning were measured according to the national standard,and the correlation analysis was carried out.The results showd that:1)The density and mechanical properties of the lower wood of the un-thinned and un-thinned Pinus tabuliformis are higher than those of the upper wood;2)The air-dry density,absolute dry density and basic density of the thinned Pinus tabuliformis are higher than those of the non-thinned Pinus tabuliformis.The basic densities are 0.45g/cm^(3) and 0.42 g/cm^(3) respectively.3)Various mechanical indexes of thinning Pinus tabuliformis(including flexural strength,flexural modulus of elasticity,compressive strength along grain,all compressive strength of horizontal grain,transverse The local compressive strength and hardness of the grain are higher than those without thinning.4)The basic density of thinned oil and un-thinned Pinus tabuliformis has greater correlation with tracheid length,tracheid width,flexural strength,and local compressive strength of transverse grains;it has little correlation with other indicators.

关 键 词：油松 间伐 密度 力学性能 相关性 

分 类 号：S791.254[农业科学—林木遗传育种]