对火炬松原产地耐寒与一般两类基因资源林的生长表现研究结果表明 ,前者保存率高 ,适应性强 ,生长均匀 ,差异不显著 ;后者则相反 ,保存率较低 ,生长优劣悬殊 ,差异显著 ,优于我国早年引入的种批 ,为重要的遗传改良资源 ,其中有 10个编号较优良 ,它们多产自美国东南沿海 ,尤其是墨西哥湾各州 在 31.3%入选率下 ,材积相对遗传增益大 2 0 .84% ;2～ 5株小样求得的生长早 晚相关趋势与前人研究一致 ,唯确定程度略低 The results of the study on the growth performance of two kinds of gene resources hardwood forests and the general two kinds of genetic resources in the origin of Pinus taeda showed that the former had high preservation rate, strong adaptability and uniform growth with no significant difference; the latter, on the contrary, had lower preservation rate and poor growth performance , Which was significantly better than that introduced in China in the early years. It is an important genetically modified resource, of which 10 are better. They are prolific in the southeastern United States, especially in the states of the Gulf of Mexico at 31.3% The genetic gain was 20.84%. The trend of early and late growth of 2 ~ 5 samples was consistent with previous studies, but only slightly lower