西南桦木材化学成分及其变异的研究

Study on the chemical component and variation of betula alnoides wood

按照我国木材化学成分分析标准,对人工林西南桦木材化学成分进行了测定,结果表明含量分别为:纤维素47.31%,多戊糖23.99%,木质素24.57%,热水抽提物4.41%,1%NaOH抽提物15.15%,苯醇抽提物1.80%,pH值4.61;以上7个指标在树干不同高度的差异均未达到显著性水平;热水、1%NaOH抽提物含量和pH值在不同树龄间的差异达到了1%显著性水平;苯醇抽提物含量达到5%显著性水平。主要化学成分含量的差异不显著。比较分析认为,就木材化学成分而言,西南桦是比较理想的板材和造纸原料。

According to the Chinese standard for wood chemical component analysis, contents of the chemical components of Betula alnoides plantation were determined. The results showed that the contents of every chemical components from Betula alnoides plantation： the contents of cellulose 47.31%, the contents of pentosan 23.99%0, the contents of lignin 24.57%, hot-water extractives are 4.41%, 1%NaOH extractives 15.15%, benzene ethanol extractives 1.80% and the pH value of wood is 4.61. The results also showed that at different heights along the tree stem and the difference of the contents among the seven targets are not significant in statistic sense. But at different years, the difference of the contents among hot-water extractives, 1%NaOH extractives and pH value of wood arrives 1% significance level, and the difference of the contents among benzene ethanol arrives 5% significance level, and the difference of the contents among important chemical components is not significant. In the aspect of the chemical component of the wood, Bettda alnoides plantation is good specie as raw material of panel and papermarking.