日本落叶松自由授粉家系纸浆材材性遗传变异的研究

对12年生日本落叶松自由授粉子代测定林纸浆材材质性状进行了遗传变异分析、遗传参数估计、相关分析及综合评价和选择。结果表明:家系间综纤维素含量、基本密度、早材和晚材纤维长度、早材和晚材壁腔比差异极显著或显著,10g·L-1NaOH抽出物差异也达10%水平显著。各性状受强度或中等强度的遗传控制,对日本落叶松进行家系水平的材性改良具有很大的潜力。木材密度与早、晚材壁腔比、10g·L-1NaOH抽出物呈显著正相关,与综纤维素含量呈显著负相关,与早、晚材纤维长度相互独立;晚材纤维长度与早材纤维长度存在紧密正相关,纤维长度与早材壁腔比存在显著负相关关系,与晚材壁腔比、综纤维素含量和10g·L-1NaOH抽出物相互独立;综纤维素含量与早材壁腔比呈显著负相关,与晚材壁腔比相关不显著;10g·L-1NaOH抽出物与综纤维素含量、早、晚材壁腔比均相互独立。根据对日本落叶松材质性状的综合评价结果,选出最适合作纸浆林培育的249、340、346、217和364号家系。

Genetic Variations in Pulpwood Qualities of Open-pollinated Japanese Larch Families

Genetic parameters and selection index for pulpwood qualities were estimated for 12-year-old open-pollinated families of Larix kaepferi. Families differed significantly in holo-celouse,basic density,fiber length of early and late wood,wall/lumen of early and late wood,and also differed in 10 g·L^-1 NaOH extract on 10% level. Heritabilities showed that all these wood qualities were strongly or moderately controlled by gene,which suggested that there were great potential to conduct the families' selection of pulpwood qualities. Correlations between basic density and wall/lumen of early and late wood,and 10 g·L^-1 NaOH extract were positively high,and holo-celouse was negatively high,and it was independent with fiber length of early and late wood. Fiber length of late wood was positively correlated with fiber length of early wood,while negatively correlated with wall/lumen of early wood,and was independent with wall/lumen of late wood,holo-celouse and 10 g·L^-1 NaOH extract. Holo-celouse was negatively correlated with wall/lumen of early wood,and was independent with wall/lumen of late wood. 10 g·L^-1 NaOH extract were independent with holo-celouse,wall/lumen of early and late wood. According to the value of selection index of 15 families,the best families for pulpwood purpose were 249,340,346,217 and 364.