摘要
以东北5个地区的白桦天然种群为材料,对其木材纤维形态性状、微纤丝角和基本密度在种群间和种群内的变异及性状表现进行了分析。结果表明,白桦木材纤维长度在种群间差异不显著,而木材纤维宽度、长宽比、微纤丝角和木材基本密度种群间差异非常显著;白桦木材纤维长度和宽度频率基本呈正态分布,木材纤维长度分布绝大部分在800～1200mm,纤维宽度分布主要在15.00～21.00μm;白桦木材纤维长度和宽度从髓心向外呈逐渐增加的趋势,达到最大值后增加缓慢。汪清、帽儿山、金山屯和塔河种群的白桦基本密度径向变异曲线与纤维长度相似,呈先上升后平缓趋势;新宾种群的白桦基本密度随树龄增加的径向变化不大,一直处在低值水平。各种群木材微纤丝角度由髓心向外逐渐变小,后趋于平缓。以上结果将为今后白桦纸浆用材林培育和现有资源利用提供理论依据。
An experiment was conducted to study the wood properties of live natural Betula platyphylla populations in northeast China, including fiber form, microfibril angle and basic density. The variation and characteristics of the wood properties within and between the populations were analysed. Result indicates that there are great differences in fiber width, microfibril angle and wood basic density between the populations, while an insignificant difference was found in fiber length. The frequencies of fiber length and width follow an approximate normal distribution. The fiber length is mostly between 800 mm and 1 200 mm, and the fiber width between 15.00 μm and 21.00 μm. The fiber length and width of the wood increase gradually from pith to bark at first, and then go up slowly after reaching the highest level. The change pattern of wood basic density is almost the same as fiber length for the populations from Wangqing, Maoershan, Jinshantun and Tahe, while there is little change in basic density from pith to bark for Xinbin population, just at a low level. A decreasing trend of microfibril angle exists in each population with increasing tree age, and then it tends to be stable.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2007年第2期1-3,6,共4页
Journal of Northeast Forestry University
基金
国家"863"项目(2002AA241080)
关键词
白桦
纤维性状
微纤丝角
基本密度
Betula platyphylla
Fiber characteristics
Microfibril angle
Basic densities
