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利用６株２７年生火炬松伐倒木解析材料，分析木材基本密度的株内变异规律。结果表明，各年轮基本密度及相应的自髓心的断面基本密度的径向变异表现为，在各断面高度随距髓心年轮数的增加而增大，到一定年轮数后增加趋缓；纵向变异则为自干基向上迅速下降，３～５ｍ高度以上保持相对稳定。相关分析表明各部位及相应的断面木材基本密度值ＢＤ与距髓心的年轮数Ｒ和其高度Ｈ位置有关，可用ＢＤ＝ａ＋ｂ／Ｒ＋ｃ／Ｈ来拟合两者的株内变化趋势。本研究样木的幼龄材与成熟材的过渡区为第１２年轮左右，幼年材与成熟材的基本密度相关随年轮数增加而趋显著及稳定，对火距松木材基本密度的早期选择宜在幼龄材至成熟材过渡年龄之后进行
Six 27-year-old Chinese pine cuttings were used to analyze the intra-plant variation of wood basic density. The results showed that the radial variations of the basic density and the corresponding basic density of the medullary section in each year showed that the height of each section increased with the increase of the number of centriodial axes and then increased after a certain number of annual cycles Slow; longitudinal variation is rapidly decline from the dry base upward, 3 ~ 5m above the height to maintain relatively stable. Correlation analysis showed that the basic density value BD of each part and the corresponding cross-section wood was related to the annual ring number R and its height H position from the medullary center. The intra-plant trend of both could be fitted by BD = a + b / R + c / H. In this study, the transition zone between juvenile and mature wood of sample wood was the twelfth round, and the basic density of juvenile wood and mature wood was significant and stable with the increase of annual number of rotation. The choice should be young to mature wood after the transitional age