3个马尾松种源材性差异及相关性

The Differences and Correlation in Wood Properties of Three Provenances of Pinus massoniana

以马尾松(Pinus massoniana)桐棉、古蓬、容县等3个种源为对象,比较了年轮宽度、晚材率、管胞形态、木材基本密度等指标的差异,并通过这些指标的相关关系导出了各个种源的密度回归模型。结果表明:种源间的年轮宽度和晚材率无显著差异且变异系数较大,其中容县种源年轮宽度最大,古蓬种源最小;容县种源平均晚材率最低,桐棉种源平均晚材率最高。种源间的管胞形态(管胞壁厚、管孔面积)和木材基本密度有显著差异,其中,容县种源的早材壁厚最厚,管孔面积最小,桐棉种源早材壁厚最薄,管孔面积最大;古蓬种源晚材壁厚最厚,管孔面积最小,容县种源晚材壁厚最薄,管孔面积与其他两个种源的平均值相似。古蓬种源平均基本密度最大为0.519 g/cm^3。上述材性指标间的相关性达显著或极显著水平。基于此,导出了以木材密度为因变量,考虑晚材率的管胞壁厚和管孔面积为自变量的三元三次方程回归模型,3个种源回归模型平均拟合度高于73%。

Ring width, latewood percentage, tracheid morphology and wood basic density of Tongmian, Gupeng and Rongxian provenances of Masson pine were analyzed to understand the differences of provenances and were investigated the correlation between these indexes. Results showed that there were no significant differences in ring width and latewood percentage of provenance and variation coefficient was large. The ring width of Rongxian provenance was the largest, and Gupeng was the smallest one. The latewood percentage of Rongxian provenance was the lowest one, Tongmian provenance was the highest one. There were significant differences in tracheid morphology (wall thickness, lumen area) and wood density of provenance. The early wood wall thickness of Rongxian provenance was the thickest one, and the lumen area was the smallest one.Tongmian was just the opposite. The latewood wall thickness of Gupeng provenance was the thickest one, and the lumen area was the smallest one. Rongxian was the thinnest one, and the lumen area was about the average of other two provenances. The average wood density of Gupeng provenance was the biggest one which was 0.519 g/cm3. The correlation between the above indexes was significant. According to the correlation between them,ternary cubic models were derived. In this model, wood density as the dependent variable, tracheid wall thickness and porosity which were considered latewood percentage as independent variables. Fitting degree of each model for three provenances was higher than 73%.