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１３年生火炬松１８个种源间木材基本密度存在着显著的差异，其广义遗传力大于０．４２，并随着树龄的增大而有加强的趋势。方差分析中种源、环境方差分量各占１／２，反映出遗传、环境对火炬松基本密度有着重要的影响。株内径向基本密度以递增模式为主，林木不同生长阶段基本密度间存在着显著的正相关，反映出早期测定是可行的。基本密度与种源原产地经度、纬度间相关系数很小，无明显的经向或纬向变异模式。种源内个体间基本密度的变异大于种源间的变异，基本密度与树高、胸径、材积存在着正相关。火炬松在种源选择的基础上进行个体选择可获得生长量、材质的双向增益。综合评估表明Ｌ１、Ｌ３、Ｌ１４和Ｌ１６为工业用材优良种源。
There was a significant difference in basic wood density among 13 provenances of Pinus taeda. Its general heritability was greater than 0.42 and tended to increase with age. Variance analysis of provenance, environmental variance components each accounted for 1/2, reflecting the genetic, the environment has a significant impact on the basic density of Pinus taeda. The radial basic density in the plant is mainly in increasing mode, and there is a significant positive correlation between the basic density of trees in different growth stages, which indicates that the early determination is feasible. The correlation coefficient between basic density and longitude and latitude of provenance is very small, and there is no obvious pattern of warp or weft variation. The variation of basic density among provenances was greater than that between provenances. The basic density was positively correlated with tree height, DBH and volume. Pinus taeda on the basis of provenance selection for individuals to obtain growth, material bidirectional gain. The comprehensive evaluation showed that L1, L3, L14 and L16 are good provenances for industrial timber.