ABSTRACT

Wood properties, including Young’s modulus, differ among clones in Larix kaempferi; however, available information is still limited on among-clonal variations of lumber qualities in L. kaempferi. The objectives of this study were to clarify the clonal variations in lumber quality and to identify the effects of juvenile wood on lumber quality in L. kaempferi. A total of 21 logs of 2.5 m in length were obtained from the trees of nine different plus clones of 57-year-old L. kaempferi trees. The logs were sawn into lumber, and the lumber was kiln-dried and planed into 38 × 89 mm in a cross-section. Lumber quality, such as bending properties, was determined. Significant differences were found in wood density, dynamic Young’s modulus, modulus of elasticity, and modulus of rupture of the lumber among the nine clones. The highest repeatability was recorded in wood density. The lumber consisting of juvenile wood showed a lower lumber quality compared to the lumber consisting of mature wood. To produce lumber with a high quality from L. kaempferi, the clonal variation of lumber quality and the existence of juvenile wood should be considered.

摘要

包括杨氏模量在内的木材特性在落叶松无性系中有所不同；然而，关于L. kaempferi木材质量的克隆间变异的可用信息仍然有限。本研究的目的是阐明木材质量的无性系变异，并确定幼木对L. kaempferi木材质量的影响。从 57 年生的L. kaempferi的 9 个不同加无性系的树上获得总共 21 根长 2.5 m 的原木树木。原木被锯成木材，木材在窑中干燥并刨成 38 × 89 mm 的横截面。木材质量，如弯曲性能，已确定。9个无性系的木材密度、动态杨氏模量、弹性模量和断裂模量均存在显着差异。最高的可重复性记录在木材密度中。与由成熟木材构成的木材相比，由幼木构成的木材显示出较低的木材质量。用柞木生产优质木材，应考虑木材质量的无性系变异和幼木的存在。