坡向对大叶相思人工林生长和材质的影响

Effects of Slope Direction on the Growth and Wood Quality of Acacia acuriculaeformis Plantations

通过对阴坡和阳坡大叶相思人工林生长特性和木材物理力学性质的测定和比较分析,结果表明:阳坡大叶相思人工林林分胸径、冠幅、树高和枝下高大于阴坡。阴坡大叶相思人工林木材密度、干缩系数和各项力学性质指标均小于阳坡大叶相思人工林;阴坡大叶相思人工林木材物理力学性质的分散程度略大于阳坡大叶相思人工林。差异显著性t检验表明:阴坡和阳坡大叶相思人工林胸径、树高、冠幅和枝下高以及木材差异干缩、顺纹抗压强度、抗弯弹性模量、顺纹抗剪强度、径面硬度、端面硬度、抗劈力和冲击韧性差异均为极显著或显著,木材气干密度和基本密度、径向干缩系数、弦向干缩系数、体积干缩系数、抗弯强度和弦面硬度差异不显著。研究结果为大叶相思人工林培育和木材合理利用提供科学依据。

Growth feature, physical and mechanical properties of Acacia acuriculaeformis wood from plantation in shade slope and sun slope were determined and analyzed comparatively. The results showed that the growth of Acacia acuriculaeformis plantation in sun slope was superior to that in shade slope while all physical and mechanical indexes of Acacia acuriculaeformis wood from plantation in shade slope were smaller than that in sun slope. Dispersions of all physi- cal and mechanical indexes of Acacia acuriculaeformis wood from plantation in shade slope were slightly bigger than that in sun slope. Different significant t test showed that there were extremely significant differences or significant ones on DBH（diameter at breast height）, height, length of branch , height under first living branch as well as ratio of tangential shrinkage to radial shrinkage, compression strength parallel to grain , elastic modulus of bending, shear strength parallel to grain, hardness of cross side, hardness radial side and cleavage strength and impact strength of their wood but no ones on density, shrinkage coefficient of radial direction , tangential shrinkage coefficient , volume shrinkage coefficient, bending strength and hardness of tangential side between Acacia acuriculaeformis wood from plantation in shade slope and that in sun slope . The conclusions provided scientific basis for plantation cultivation and rational utilization of Acacia acuriculaeformis .