论文部分内容阅读
研究了不同培育措施(初植密度、间伐强度、坡向、坡位)对人工林樟子松(Pinus sylvestris var.mongolica)木材的密度和力学性质(横纹抗弯强度、抗弯弹性模量、顺纹抗压强度、冲击韧性、端面硬度)的影响。初植密度(1.5m×1.0m,1.5m×2.0m和1.5m×2.5m)对木材密度和抗弯弹性模量有显著的影响。初植密度为1.5m×1.0m时,木材主要力学指标值最大。适当间伐可提高木材的抗弯弹性模量和顺纹抗压强度,但重度间伐则会降低木材的力学强度。坡向(阳坡和阴坡)对木材的抗弯弹性模量影响显著,阳坡高于阴坡。坡位(上坡位和下坡位)对除端面硬度外的木材力学性质指标影响都显著,各项力学指标值均是坡下高于坡上。表5参9。
The effects of different cultivation methods (initial planting density, thinning intensity, aspect and slope position) on the density and mechanical properties of Pinus sylvestris var. Mongolica wood were studied. The transverse bending strength, flexural modulus, Grain compressive strength, impact toughness, face hardness). The initial planting density (1.5m × 1.0m, 1.5m × 2.0m and 1.5m × 2.5m) significantly affected the wood density and flexural modulus. When the initial planting density is 1.5m × 1.0m, the main mechanical index of wood is the largest. Appropriate thinning can improve the flexural modulus and compressive strength of wood, but heavy thinning will reduce the mechanical strength of wood. The slope direction (sunny slope and shady slope) has a significant effect on the flexural modulus of wood, while the sunny slope is higher than the shady slope. The influence of slope position (uphill position and downhill position) on the mechanical properties of wood except for the hardness of the end face is significant. The mechanical indexes are all above the slope. Table 5 reference 9.