摘要
以子代测定林为样本,研究了高产脂马尾松间伐材的基本材性及其在径向、纵向的变异,分析了材性指标间的相关性.结果表明,木材的生长轮宽度和晚材率分别为6.64 mm、9.44％,基本密度和绝干密度分别为0.33、0.36 g·cm-3,平均纵向、径向、弦向和体积全干干缩率分别为0.43％、2.81％、4.94％、8.02％,早材(晚材)管胞的长度、直径、壁厚、长径比、壁腔比和柔性系数分别为2.68 mm(3.12 mm)、40.70 μm(33.24 μm)、4.60 μm(7.08 μm)、64.98(92.90)、0.31(0.83)、77.14(57.26).与近髓心部位相比,近树皮部位木材密度较高,管胞壁厚且较细长,纵向干缩小而体积干缩大; 沿树干基部至树梢部位,木材密度变小,弦向、径向和体积干缩率呈减小趋势,管胞形态各项指标总体呈先增加后减小的趋势.晚材率与木材密度、木材干缩性显著相关,木材密度与弦向全干干缩率、体积全干干缩率、早材管胞直径和早材管胞长径比显著相关.
Abstract
The basic properties of Pinus massoniana thinning wood with high-yield rosin from progeny test forest were investigated,and their variation in both radial and longitudinal directions were discussed,then the correlation among the properties was analyzed.The results showed that the annual ring width and latewood rate were 6.64 mm and 9.44％,respectively.The basic density and oven-dry density were 0.33 and 0.36 g·cm-3,respectively.The longitudinal,radial,tangential and volume oven-dry shrinkage were 0.43％,2.81％,4.94％and 8.02％,respectively.The length,diameter,wall thickness,length/diameter,wall thickness/lumen diameter and flexible coefficient of the earlywood(latewood)were 2.68 mm(3.12 mm),40.70 μm(33.24 μm),4.60 μm(7.08 μm),64.98(92.90),0.31(0.83)and 77.14(57.26),respectively.Compared with the properties of wood nearby core,wood nearby bark showed higher density,thicker and slenderer cell wall,smaller oven-dry longitudinal shrinkage,and larger oven-dry volume shrinkage.Along the longitudinal direction from trunk base to treetop,the wood density as well as the tangential,radial and volume oven-dry shrinkage decreased,and the indexes of tracheid morphology generally first increased and then decreased.The latewood rate was significantly correlated with wood density and oven-dry shrinkage,while the wood density was significantly correlated with oven-dry tangential shrinkage,oven-dry volume shrinkage,and diameter and length/diameter of earlywood tracheids.
基金项目
国家科技支撑计划项目(2015BAD09B0102-2)
国家科技期刊平台
NSTL
维普
万方数据