抚育间伐对人工林红松木材材质的影响

对间伐与未间伐人工林红松（Pinus koraisensis)木材材质进行系统测定、统计分析，结果表明：间伐对木材材质有很大的影响，间伐林的管胞长度、管胞直径、纤丝角、生长速率、生长轮宽度、顺纹抗压和抗拉强度、抗劈力和冲击韧性大于未间伐林；间伐林木材晚材率、生长轮密度、壁厚、壁腔比、抗弯强度和局部抗压强度小于未间伐林。其中管胞直径、生长轮宽度、壁厚、壁腔比、抗变强度、顺纹抗压和抗拉强度、横纹局部抗压强度的差异达到显著水平，表明间伐能显著地提高木材力学性能。采用综合坐标法，对间伐与未间伐人工林红松木材材质进行评定，其材质的综合性能和纸浆材性能未间伐林好于间伐林，建筑材料性能间伐林好于未间伐林。

The Effect of Thinning upon the Wood Qualities of Pinus koraiensis Plantation

Wood qualities of Pinus koraiensis plantation from thinning and non-thinning plantation were systematically determined through a series of experiments, and data were statistically analysed. Results show that thinning had some effects on wood qualities, tracheid length, tracheid diameter, fibril angles, growth rate, growthring width, parallel-to grain compressive and tensile strength, cleavability, impact toughness for thinning plantation are higher than those of non-thinning plantation. Late percentage, growthring density, wall thickness, wall-diameter ratio, static bending strength and compressive strength to the grain of part are lower for thinning plantation than those of non-thinning plantation. There were highly significant effects on tracheid diameter, growthring width, wall thickness, wall-diameter ratio, static bending strength, parallel-to grain compressive and tensile strength and compressive strength to grain of part. Wood mechanical properties were improved remarkably by thinning. By comprehensive coordinates, the wood qualities of thinning and non-thinning plantation were evaluated, the comprehensive properties and pulpwood properties of non-thinning plantation are good, the structural wood properties of thinning plantation is good.