摘要
按国家标准对河北省木兰围场国有林场管理局华北落叶松和长白落叶松木材基本物理力学性质进行对比试验,结果表明:2种落叶松木材的pH值均呈酸性;长白落叶松的晚材率为29.70%,大于华北落叶松的26.30%;2种落叶松的弦向干缩率均大于径向干缩率,长白落叶松的干缩率略小;长白落叶松的气干密度为0.547g/cm3,略大于华北落叶松的气干密度0.534g/cm3,长白落叶松全干密度为0.413g/cm3,小于华北落叶松的0.419g/cm3;顺纹抗压强度和弹性模量中,长白落叶松为59.0 MPa和11.48GPa,华北落叶松为59.3MPa和12.87GPa,华北落叶松的力学性质较好;华北落叶松管胞的长度为2 490.24μm、宽度为28.45μm、长宽比86.43,略优于长白落叶松管胞长度2 684.42μm、宽度36.12μm、长宽比80.12。通过方差分析可知,2种落叶松管胞宽度差异显著,其余所测木材的材性无显著差异,长白落叶松晚材率较高、干缩稳定性较好、力学性质略小。
Based on the national criteria,an experiment was conducted to study the differences between Larix principis-rupprechtii and Larix olgensis var.koreanaintroduced by Forestry Management Bureau of Hebei.Results showed that the pH of two kind larchwood was acid,with higher latewood percentage（29.70%）of Larix olgensis var.koreanathan Larix principis-rupprechtii（26.30%）,and larger tangential shrinkage rate than radial shrinkage rate.The shrinkage rate of Larix olgensis var.koreana was small,Larix olgensis var.koreanaair-dry density was 0.547g/cm3 slightly larger than 0.534g/cm3 of Larix principis-rupprechtii.The fully dry density of Larix olgensis var.koreana was 0.413g/cm3 lower than 0.419g/cm3 of Larix principis-rupprechtii.The longitudinal compressive strength and elastic modulus of Larix olgensis var.koreana were 59.0MPa and 11.48GPa,respectively while the ones of Larix principis-rupprechtii were 59.3MPa and 12. 87GPa,with the tracheid length and width of 2 490.24μm and 28.45μm,as well as the tracheid length width ratio of 86.43.The Larix principis-rupprechtii tracheid length（2 490.24μm）,width（28.45μm）and the length width ratio（86.43）were a little better than Larix olgensis var.koreana ones.There were no significant differences among the wood material except the tracheid width. Compared to Larix principis-rupprechtii,Larix olgensis var.koreanahad a higher latewood ratio and better dry shrinkage stability but the mechanical property was smaller.The research provides a theoretical basis for Larix olgensis var.koreana widely cultivation and production of high quality timber in North China,and references for production practice.
出处
《河北林果研究》
2014年第1期17-22,共6页
Hebei Journal of Forestry and Orchard Research
关键词
长白落叶松
华北落叶松
材质
材性
Larix olgensis var.koreana
Larix principis-rupprechtii
wood properties
wood qualities
作者简介
徐成立（1970-），男，河北承德人，博士，河北省木兰围场国有林场管理局党委书记，高级工程师，研究方向：森林经理专业。
通讯作者：黄大庄（1963-），男，河北保定人，博士，河北农业大学教授，研究方向：森林保护专业。
