马占相思木材解剖特性研究

Research on wood anatomy characteristics of Acacia mangium Willd

对采自广西国营高峰林场9.5年生的马占相思木材解剖构造特征进行研究。结果表明:心边材区别明显,心材率高,全树平均55.6%;生材绝对含水率为96.9%;树皮率为12.99%;生长轮宽度平均为22.82mm。木纤维长度、直径、双壁厚、长径比均随着树龄的增加而增加,其平均值分别为891.2μm、20.34μm、6.05μm和46.0。微纤丝角随着树龄的增大变化不大,平均值为9.8°。木纤维比量、木射线比量、导管比量、薄壁组织比量的平均值分别为:70.2%、14.3%、9.9%、5.6%,各组织比量随着树龄的增加变化较小。

9.5 years old trees of Acacia mangium Willd were sampled in Gaofeng Forestry Farm in Guangxi,to study their wood anatomy characteristics.The results show that: There are significant differences between heartwood and sapwood,and heartwood percentage is as high as 55.6%.The absolute moisture content of green wood,bark percentage and growth ring width are 96.9%,12.99% and 22.82 mm respectively. The fiber length,diameter,cell wall thickness and ratio of length to width are 891.2 μm,20.34 μm,6.05 μm and 46.0 respectively,and they all gradually increase with the increase of ages. The average value of microfibril angle is 9.8° and it almost keeps constant with the increase of ages.The proportions of wood fiber,wood ray,vessel and parenchyma are 70.2%,14.3%,9.9% and 5.6% respectively,and all wood tissues proportion are almost constant with ages.