【摘要】 通过对西南桦木材微纤丝角径向变异规律的研究,得出结论:(1)从心材到边材木材微纤丝角从大逐渐变小;(2)在同一个年轮内,早材微纤丝角总是大于晚材微纤丝角,整体趋势为从早材开始至晚材呈波动递减,即在早材开始处最大,向晚材逐渐减少;(3)南向的微纤丝角大于北向的微纤丝角;(4)幼龄材和成熟材的界限在14～17年轮。更多还原

【Abstract】 The radial variation patterns of microfibril angle of Alder Birch was analysed in this paper.The results are as follows:1.the microfibril angle of heart wood is greater than that of sapwood.2.the microfibril angle of the earlywood is always greater than that of the latewood.3.the microfibril angle of the south is always greater than that of the north.4.the boundary between juvenile wood and mature wood ofAlder Birch is in the 14-17 growth rings.更多还原