以微密度分析对１９ 个种源杉木的木材密度径向变异模式进行了研究。不同种源间和种源内株间，年轮平均密度的径向变异曲线都存在一定的变异，但此变异主要表现在种源内株间。年轮平均密度的幼龄—成熟相关性从第３ 年起就极显著。由微密度分析得出的一系列密度和年轮宽特征值间的相关分析表明，在年龄影响下的变异过程中，年轮内密度变异曲线随年轮宽的变动导致晚材率变动的效应较为显著，年轮平均密度主要受晚材率影响；年轮平均密度与年轮宽呈特别显著的负相关。而在种源影响下的变异过程中分析，上述效应不明显，而不同种源间密度变异曲线的上下移动影响显著；年轮平均密度主要受早材平均密度影响；年轮平均密度与年轮宽的负相关远不如在年龄影响下的变异过程中显著 Micro-density analysis of wood density of 19 provenance fir radial variation patterns were studied. There was a certain variation in the radial variation curve of average density of annual rings between different provenances and within provenances, but this variation was mainly manifested in the strains within the provenances. The young-mature correlation of annual mean density of rings has been extremely significant since the third year. The correlation analysis between a series of eigenvalues ​​of density and annual ring width derived from micro-density analysis shows that the effects of age-specific variation in annual ring width variation with annual ring width variation The average annual ring density is mainly affected by the late timber rate; the average annual ring density and annual ring width are particularly significant negative correlation. While in the process of variation under the influence of provenances, the above-mentioned effects were not obvious, but the up-and-down movement of density variation curves was significantly affected by different provenances. The average annual ring density was mainly affected by the average density of earlywoods. The wide negative correlation is far less significant than the variation under the influence of age