以３０年和５４年生长白落叶松人工林为样本，对木材材质性状的株内变异进行了分析。试验结果表明：①由树干基部至树梢，基本密度逐渐减少，管胞长度先逐渐增加，达最大值后逐渐缩短；②由髓心至形成层，基本密度、管胞长度迅速增大，至第２０轮后增幅变小；③用胸高处任一半径方向的基本密度和管胞长度可以估算树干平均值；④胸高木芯法为合理的、实用的取样方法 Based on the 30-year and 54-year-old Larix olgensis plantations, intraspecific variations of wood quality traits were analyzed. The results showed that: (1) The basic density gradually decreased from the base of the trunk to the tip of the tree, and the tracheid length increased first and then decreased to the maximum; (2) From the pith to the cambium, the basic density and tracheid length increased rapidly to After the 20th round, the increase rate becomes smaller; ③the average density of tree trunks can be estimated by the basic density and tracheid length in any radial direction at the chest height; ④the chest height wood core method is a reasonable and practical sampling method