水曲柳枝桠材应力木的年轮偏向性分析  

The Analysis of Growthring Deflection Pattern in Ash Branch Reaction Wood

作　　者：罗蓓[1] 聂梅凤[1] 

机构地区：[1]西南林学院西南山地森林资源保育与利用省部共建教育部重点实验室,云南昆明650224

出　　处：《山东林业科技》2010年第2期6-8,共3页Journal of Shandong Forestry Science and Technology

摘　　要：运用SEM显微观察技术,对比分析了水曲柳枝桠材断面应拉区和对应区木质部在微观构造上的异同,并在此基础上讨论了水曲柳应力木的年轮偏向性问题。结论如下:水曲柳应力木的髓心偏向断面上侧,在此区域有大量胶质木纤维形成,干燥时开裂较明显,而下侧的宽年轮区域仅有极少量厚壁纤维存在,基本无开裂。说明在水曲柳应力木中,应拉木主要存在于断面上侧的年轮较窄区域,胶质木纤维的大量存在是其典型特征。By means of TEM detection, the research analyzed the differences and similarities in microstructure of ash tension wood and opposite wood on its descending branch cross--section and discussed the deflection pattern of growthring on its cross--section. The results show that the tension area in ash reaction wood, where pith bias to the upper--side of the crosssection has great deals of gelatinous fibers leading to more dry cracks. As while there are only little gelatinous fibers in the opposite area with wider growthring. Therefore, it is concluded that in ash reaction wood, tension wood generally lies on the upper- side of its slanted branch cross--section with narrow growthring and gelatinous fibers as its typical characteristics.

关 键 词：应拉木 胶质纤维 年轮偏向性 

分 类 号：S781[农业科学—木材科学与技术]