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本文以安徽琅琊山天然林内的三株刺楸木材为材料，详尽研究其基本密度的径向变异、轴向变异以及影响基本密度变化的主要因子，结果发现：刺楸木材基本密度的径向变化趋势为自髓心向外以曲线形式降低，到一定年限后保持平缓或略有下降，用幂函数模拟，相关系数在０．８以上；轴向变化趋势为自树干基部向上渐增大，到５．３ｍ处达最大值，再向上到树冠基部又变小；方差分析表明株间变异大于株内变异；从解剖分子组织比量来看，基本密度变异的６３．７％主要是由导管比量，木射线比量和纤维比量引起的。
In this paper, three Catalpa bungei woods in Langya Mountain of Anhui Province were used as materials to study the radial variation, axial variation and the main factors that affect the basic density. The results showed that: The trend is from the medullary outward curve in the form of down to a certain number of years to maintain a gentle or slightly decreased, with a power function simulation, the correlation coefficient of 0.8 or more; axial trend upward from the base of the trunk gradually increased to 5.3m at the maximum, and then up to the crown of the canopy again smaller; variance analysis showed that variation between strains greater than intraspecific variation; from anatomical molecular ratio, the basic density variation of 63.7% mainly by the catheter ratio Volume, wood-ray ratio and fiber ratio caused.