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对６年生火炬松自由授粉子代测定林进行了生长、材性和干形等性状的遗传参数估算和相关关系分析。树高、木材基本密度在家系间存在极显著差异，且具较高的遗传力，胸径、材积、干材干重和管胞长度具中度遗传力，树干通直度和分枝性状未发现显著的家系间差异。干材干重与生长性状呈高度正相关，与木材基本密度呈微弱的负相关，而与管胞长度呈负相关。以纸浆材为选择目的进行家系指数选择，认为包含产量（干材干重）和质量（木材基本密度）两个直接目的性状，并给予前者较大权重的指数较为理想。据此选出了五个产量和材性均较优的家系
The 6-year-old Pinus taeda free pollinated offspring of Lin determination of genetic parameters such as growth, wood properties and dryness estimates and correlation analysis. Tree height and wood basic density were significantly different among the families, with high heritability. The heritabilities of DBH, volume, dry weight and tracheid length were moderately heritability, and the straightness and branching traits of trunk were not found Significant pedigree differences. Dry weight and growth traits were highly positively correlated with the basic density of wood was weakly negative correlation with the tracheid length was negatively correlated. Based on the choice of pulpwood, the index of pedigree was selected. It is considered that the index which contains two direct traits, such as yield (dry weight of dry wood) and quality (wood basic density), and giving the former a greater weight, is preferable. Based on this, five families with better yield and material properties were selected