黑木相思株内木材基本材性变化与树龄关系的研究

Wood Properties Variation in Radial Direction within Trees of Different Aged Acacia melanoxylon

对不同树龄和径向位置黑木相思木材的物理和主要力学性质测定研究表明:黑木相思株内边材、心材密度和主要力学性质随着树龄的增大而增大,径向和弦向的体积干缩率随着树龄的增大而减小;相同树龄黑木相思的边材密度和力学性能比心材小,干缩率比心材大。因此,在利用黑木相思时应对树龄、心边材径向位置加以特别考虑。

The research on the physical and the main mechanical properties of different tree age and radial position on Acacia mensuration wood shows that： When the tree′s age increases,the density and the main mechanical properties within trees of Acacia mensuration wood′s sapwood and heartwood increases,but the volume shrinkage rate of radial and tangential reduces;On the same old Acacia mensuration wood,the sapwood＇s density and mechanical properties is lower than the heartwood′s,but the dry shrinkage is higer.Therefore,there is a special consideration on the radial position of heartwood and sapwood and the tree′s age when using the Acacia mensuration wood.