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火炬松２１个种源间木材基本密度存在着显著的差异；基本密度与原产地纬度正相关显著、与年均温负相关显著。各种源株内径向基本密度呈递增的模式．各年轮段间基本密度正相关极其显著。５年生基本密度可预测９年生、１２年生的木材基本密度。木材基本密度与生长量因子间总体上呈现不显著的负相关。但在部分种源内表现为正相关．材质改良时应注意这个问题。
There were significant differences in basic wood density among 21 provenances of Pinus taeda. The basic density was positively correlated with the latitude of the place of origin and negatively correlated with the annual average temperature. The radial basic density of all kinds of plants showed an increasing pattern. The positive correlation between the basic density of rounds in each year was extremely significant. 5-year basic density can predict 9-year-old, 12-year-old wood basic density. There was no significant negative correlation between wood basic density and growth factors. However, some provenances showed positive correlation. Material improvement should pay attention to this issue.