摘要
为了研究火炬松纸浆材、建筑材定向培育过程中密度调控对其木材性质的影响规律,以12年生、6年生火炬松人工林为材料进行火炬松中、幼龄林间伐试验.结果表明:间伐对火炬松树高生长量无显著性影响,对直径和材积有极显著影响,间伐强度越大,直径和材积增长越快;间伐对火炬松出材量有极显著影响,强度间伐越大,火炬松出材量越高;间伐对火炬松生长轮宽度有显著影响,而对晚材率无显著影响,随着间伐强度的增加,生长轮宽度、晚材率增加;间伐对火炬松木材密度无显著影响,但木材密度随间伐强度的增加而提高;间伐对火炬松的木材干缩率有显著影响,随着间伐强度的增加,弦向干缩、径向干缩和体积干缩率下降;间伐对火炬松木材纤维的长度、宽度与长宽比无显著影响,但中龄火炬松木材纤维长度与宽度随间伐强度的增加有所下降,而幼龄火炬松木材纤维宽度随间伐强度的增加而增加,木材纤维长宽比则为一常数;间伐对火炬松顺纹抗压强度、抗弯弹性模量有显著影响,对中龄火炬松抗弯强度有显著影响,而对幼龄火炬松抗弯强度无显著影响,间伐后火炬松的主要力学性质增强.
To study the effect regularities of Loblloly stand density on the wood properties of pulp wood and construction wood, this essay conducted a test on the thinning intensity of Loblloly pine plantation at the age of 6 and 12. Results show as follows. Thinning has no significant effects on height increment, but it has highly significant effects on diameter and volume. The more intensity of thinning the stand receives, the more it grows in diameter and volume increment. Thinning has highly significant effects on general timber volume. The more intensity, the more in general timber volume. Thinning has significant effects on width of growth ring but it has no significant effects on late wood ratio. The more intensity, the more increase of width of growth ring and late wood ratio. Thinning has no significant effects on gravity; the gravity improves with thinning intensity increase. Thinning has significant effects on shrinkage ratio; therefore, the radial shrinkage ratio and volume shrinkage ratio and tangential to radial shrinkage ratio decrease with thinning intensity increase. Thinning has no significant effects on fibre length and width and ratio of length and width; thus the fibre length and width decrease with thinning intensity increase on the age of 12 and the fibre length and width improves with thinning intensity increase on the age of 6. The ratio of width and length is constant. Thinning has significant effects on compression strength parallel to grain and modules of elasticity. Thinning also has significant effects on bending strength on the age of 12 but no significant effects on bending strength on the age of 6. The main wood properties have quite improved since thinning.
出处
《中南林学院学报》
CSCD
2004年第2期23-27,共5页
Journal of Central South Forestry University
基金
国家"九五"攻关"国外松优良种植材料培育技术研究"
编号为96-011-03-02-06.
关键词
木材学
间伐
定向培育
木材性质
火炬松
wood science
thinning
direction culture
wood properties
Loblloly pine(Pinus taeda L.)
