不同坡位人工林赤松木材材性的径向变异

以吉林省延吉市林业局帽儿山林场赤松Pinus densiflora人工林为例,对坡下、坡中和坡上等3种坡位人工林赤松木材的管胞形态特征和物理力学性征的径向变异模式及差异进行研究.结果表明:不同坡位条件下微纤丝角和基本密度及壁腔比等指标表现为在0.01水平上有显著性差异,其中,坡中人工林赤松木材管胞壁腔比平均值比坡下和坡上分别大11.62%和16.45%,微纤丝角的平均值分别比坡上和坡下小54.31%和38.77%,生长轮基本密度平均值分别比坡上和坡下大10.5%和7.02%.从各种指标差异的分析结果来看,坡中的人工林赤松木材更适合于做结构材料.图9表3参6

Radial variations of the timber properties of Pinus densifiora planted in different slope places

The radial variation models and differences of the tracheid morphological and physico-mechanical characteristics of Pinus densifiora plantations in the below, middle and upper slopes in the Mao'er Mountain Forestry Center in Yanji City were studied. The results showed that micro-fibril angle, basic density and the ratio of wall to diameter of P. densifiora plantations in the different slopes were magnificently different at the 0.01 level. The average values of ratio of wall to diameter of P. densifiora in the middle slope were 11.62% and 16.45% higher than those in the below slope and upper slope. And the average value of micro-fibril angle of the former was 54.31% and 38.77% less than the latter,and the average value of basic density was 10.5% and 7.02% higher. The variations results showed that P.densifiora plantation timber in the middle slope was the best structure material, and others was more suitable for the pulp materials.ig.3