欧美杨107杨木材纤维形态分析

Morphological Analysis of the Fibers of Populus×euramericana cv."74/76"

对5年生和16年生人工林欧美杨107杨(Populus×euramericana cv.‘74/76’)木材纤维长度、纤维宽度、纤维壁厚、纤维腔径、纤维长宽比和壁腔比等形态特征指标进行了测试。结果表明,5年生107杨在径向上,木材纤维长度、纤维壁厚、长宽比的变异均是自髓心向外逐年增大;纤维宽度自髓心向外逐年增大,至第4年达最大值,此后再减小;纤维腔径总体变异趋势与纤维宽度相一致;壁腔比变化幅度不大。与16年生107杨相比较可得出,纤维长度、纤维宽度和纤维壁厚均随树龄的增长而增大,而纤维腔径随树龄的增长而减小。

The key fiber morphological features, fiber length, fiber width, cell wall thickness, fiber lumen diameter, ratio of length to width and ratio of cell wall thickness to lumen diameter of 5-year-old and 16-year-old Poplar 107（Populusxeuramericana cv.＇74/76＇）were determined and analyzed. The results were as fllows. For the 5-year-old in the radial variance, the fiber length, the cell wall thickness, the ratio of length to width all increase year after year outwardly from pith, while the fiber width increases year after year and reaches maximum at the 4th year then decreases; the total variance of the fiber lumen diameter is the same as that of fiber width; the ratio of cell wall thickness to lumen diameter mostly fluctuates in a small range. Compared with the 16-year-old, fiber length, fiber width and cell wall thickness all increase with the age, while fiber lumen diameter decreases.