对河南引种火炬松两批种源 (耐寒火炬松和一般火炬松 )木材基本密度的变异进行研究 ,结果表明 :火炬松种源间木材基本密度差异显著 ,木材基本密度种源内差异较种源间差异更大 ,种源基本密度性状受环境影响较大。种源间各年轮段木材基本密度均近似于正态分布 ,且随树龄增加而增大 ,呈现出径向递增的模式。木材基本密度早晚期相关性随树龄增大而加强 ,5年生木材基本密度预估 1 2年生木材基本密度是可行的。一般种源木材基本密度与纬度呈不显著的负相关 ,与经度呈显著的正相关 ;耐寒种源木材基本密度与纬度呈不显著的正相关 ,与经度呈不显著的负相关 The results showed that there was significant difference in the basic density of wood between two provenances of Pinus taeda, and the differences in the basic density of wood between provenances were higher than those of provenances The differences are greater, and the basic density characters of the provenances are greatly affected by the environment. The basic density of wood in each rotation stage of provenances was similar to normal distribution, and increased with the increase of tree age, presenting a pattern of radial increment. The early and late correlation of wood basic density is strengthened with the increase of tree age. It is feasible to estimate the basic density of wood for 12 years with the basic density of 5-year-old wood. There was no significant negative correlation between the basic wood density and latitude, but significant positive correlation with longitude. There was no significant positive correlation between wood basic density and latitude, but no significant negative correlation with longitude