气候和地形对米老排人工林生长和材质的影响

比较分析了米老排人工林胸径和树高生长以及木材品质在不同气候、不同地形条件下的表现差异，结果表明：相同地形条件下生长在南亚热带的米老排人工林林分胸径和树高以及木材密度、顺纹抗压强度和抗弯强度大于生长在中亚热带的，而木材尺寸稳定性小于生长在中亚热带的。相同气候条件下，山谷中的米老排人工林林分胸径和树高以及木材尺寸稳定性大于山脊上的，木材密度、顺纹抗压强度和抗弯强度则小于山脊上的。差异显著性t检验表明：气候和地形对米老排人工林林分胸径和树高影响均极显著，对米老排人工林木材密度、顺纹抗压强度和抗弯强度影响极显著或显著；地形对米老排人工林差异干缩影响极显著或显著，气候对米老排人工林差异干缩影响不显著。综合考虑，要获得优质速生的米老排木材，宜选择南亚热带的山谷进行人工林建设。

Effects of Climate and Landform on Growth and Quality of Mytilaria laosensis Plantations

Difference of DBH(diameter at breast height)growth, height growth and wood quality of Mytilaria laosensis plantation in different conditions of landform and climate were analyzed. The results showed that,First,under the same landform condition,DBH,height,density, compression strength parallel to grain and bending strength of M. laosensis wood from plantation growing in southern subtropics were bigger than that in middle subtropics,while size stability was smaller Second,under the same climate,DBH,height,and size stability of M. laosensis wood from plantation growing in the valley were bigger than that on the ridge,while density, compression strength parallel to grain,and bending strength were smaller. Different significance t test showed that both climate and terrain influenced extremely significantly on DBH and height and affected extremely significantly or significantly on density, compression strength parallel to grain and bending strength. Terrains influenced extremely significantly or significantly on ratio of tangential shrinkage to radial shrinkage while regions affected not significantly on ratio of tangential shrinkage to radial shrinkage. In all, valley in southern subtropics was appropriate to be chosen to construct M. laosensis forest stand for more wood with high quality.