火炬松遗传资源林的生长表现

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

Growth Performance of the Loblolly Pine Genetic Resources

This paper studied the growth performance of loblolly pine generesources with in cold-hardy and regular provenances. The results indicated that the cold-hardy gene resources showed higher survival rate, better adaptability and uniformity in growth and without significant difference. The regular gene resources were the contrary, with lower survival rate, great variation in growth and significant difference among seed sources. The growth performance was superior to that of the early introduced loblolly pine seed lots in China. These provenances are the important genetic resources for tree improvement. Among these gene resources there were 10 superior numbers from the southeast coastal states in the U.S.A., especially those from the Mexican Bay States. Under 31.3% selection rate, the relative genetic gain was 20.84%. The juvenile-mature growth correlation trend derived from small samples of 2～5 trees, was in accordance with the former researches, only with a slightly lower the determination coefficient.