对火炬松不同种源材性变异分析表明,基本密度具有明显的倾群性。美国西南沿海一带各种源基本密度较大,但种源间材性差异不显著,而种源内差异显著;生长与材性相互独立,可以进行生长与材性联合选择。选用生长、材性、适应性及抗性四类11个数量指标进行主分量和聚类分析,为北亚热带地区选择了不同材种栽植的6个优良种源。 The analysis of the material variation of different provenances of Pinus taeda shows that the basic density has obvious herbage agglomeration. The basic density of various sources along the southwest coast of the United States is relatively large, but the material differences between provenances are not significant, while the sources within the provenances are significantly different. The growth and material properties are independent and the combination of growth and wood properties can be selected. The eleven quantitative indexes of growth, material, adaptability and resistance were selected to conduct principal component analysis and cluster analysis. Six excellent provenances were planted for different sub-species in the northern subtropical region.