不同坡向人工林赤松材性变异

以延吉市林业局帽儿山林场赤松人工林为例，对北坡和南坡两种坡向赤松人工林木材的管胞形态特征和物理力学特征的径向变异模式及差异进行研究。结果表明，管胞直径和微纤丝角及生长轮宽度等指标表现为差异显著。在相同轮龄范围内，管胞长度、管胞宽度、管胞长宽比、管胞壁腔比、微纤丝角、生长轮基本密度、晚材率、生长轮宽度等指标中，除生长轮基本密度平均值指标北坡的比南坡的大之外，其它指标的平均值均为南坡的大于北坡。

Variations of Wood Property for Pinus densiflora Plantation at Different Slope Directions

Taking Pinus densiflora plantations at northern and southern slopes in the M aoershan Forest Farm, Yanji City as an example, the radial variation pattern and differences for morphological characteristics and physical and mechanical featu res of wood tracheid were studied. The results showed that there were distinct d ifferences in micro-fibril angle, width of growth-ring and tracheid diameter. Ju dging from the average value of every index, the ratio of wall to indiameter, mi cro-fibril angle, ratio of late wood, the width of growth-ring, tracheid length, tracheid width and the ratio of length to width of Pinus densiflora plantat ions with the same forest age at southern slope were higher than those of planta tions at northern slope, except basic density of growth-ring.