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.