人工林马尾松晚材率、年轮宽度和组织比量变异研究

Variation Studies on Latewood Percentage,Tree-ring Width and Tissue Proportion of Pinus massoniana Plantation

对22年生人工林马尾松木材年轮宽度、晚材率和组织比量进行系统的测量、统计和分析,结果表明,年轮宽度随树龄增加先增加后减小,而随树干高度的增加先减小后增加。晚材率随着树龄增加呈波动增大,而随树干高度的增加呈逐渐减小趋势。木射线比量和树脂道比量随树龄增加呈波动增大,但总体变幅不大,而前者随树干高度的增加呈波动减小,后者先减小再增大。管胞比量随树龄增加呈波动减小,而随树干高度的增加先增加,达到一定值后减小,然后再增加。方差分析表明,年轮宽度、晚材率、组织比量在各年轮间、各高度间差异显著或极显著。

The tree-ring width, latewood percentage and tissue proportion of 22-year-old P. massoniana plantation were systematically measured and statistically analyzed. The results showed that tree-ring width increased first and then decreased as the tree age going up while it decreased first and then increasod as the increase of stem. The latewood percentage increased fluctuantly as the in- crease of tree age while decreasing gradually as the increase of stem. The wood ray proportion and resin canals proportion increased fluctuantly as the increase of tree age, while the overall changes were slim. The former decreased fluctuantly as the increase of stem, while the latter decreased followed by in- crease. The tracheid proportion increased fluctuantly as the increase of tree age, while increasing first followed by decreasing at the certain value and then increasing. Variance analysis showed that the differences of tree-ring width, latewood percentage and tissue proportion among rings and heights were significant or very significant.