木材材性株内径向变异模式初探Ⅱ．七个加勒比松种源木材密度径向变异模式的研究

PRELIMINARY STUDIES ON RADIAL VARIATION PATTERNS OF WOOD PROPERTIES WITHIN TREES Ⅱ. STUDIES ON THE RADIAL VARIATION PATTERNS OF WOOD DENSITY IN 7 CARIBBEAN PINE PROVENANCES

以微密度分析对属三个变种的七个加勒比松种源的木材密度径向变异模式进行了研究。主要结果是；各种源各株木材密度的径向变异曲线概貌大体一致，但不同种源间和种源内不同株间变异模式都有一定的变异，存在一定程度的不确定性；年轮平均密度的种源间差异在成熟材的大部分年龄上达０．０５或０．０１水平显著，而在幼龄材的半数年龄上差异不显著；表征变异模式的数字特征的种源间差异不显著。种源间和种源内株间年轮平均密度变异曲线间存在一定程度的交叉，种源间的年－年相关较显著，株间则大部分情况下相关不显著，但差异较大的株间相关显著。密度特征值间和密度特征值与年轮宽特征值间的关系，在年龄影响下和种源影响下两个变异过程中的分析结果，一部分比较一致，一部分则有差别。ＲＤ与ＲＷ的负相关主要表现在年龄影响下的变异过程中，而在种源影响下的变异过程并不显著。

The radial variation patterns of wood density in 7 Pinus caribaea provenances from an experimental plantation in Guangxi Province were studied by X-ray wood densitometry. The main results obtained are: 1) The general trends of the density profiles of the trees were similar,while there existed a certain degree of variations among provenances and among individual trees. Therefore ,the indefiniteness in describing the variation patterns is inevitable. The variance analysis showed more significant differences in average ring density among provenances in mature wood than in juvenile wood. The differences in the parameters related to the variation patterns among provenances were nonsignificant. 2)The juvenile to mature age-age correlations of the average ring density among provenances and among individual trees with relatively large differences in between were significant. 3)The significance of the correlations between density components and between density components and ring width components related to the effect by provenances partly differed from those related to the effect of ages. The negative correlations between wood density and ring width were mainly shown in the variation related to the effect of age other than that related to provenances.