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以美国引进的北美悬铃木种源上海松江试验点5年生的试验林为材料,根据2004年底的试验结果,进行了优良家系及优良单株的选择。结果表明:在松江试验点,不同种源间和种源内的家系间存在明显遗传差异。根据表型选择的12个优良家系,其树高、胸径、材积方面分别比家系平均值高出6.5%、12.31%、28.54%;选出的16个优良单株,其树高、胸径、单株材积增幅分别为18.05%、38.79%、100.55%,其中这3个性状增幅最大的单株分别增加了44.07%、62.91%、224.92%。综合优良家系及优良单株的评选表明,适合松江点的材料多分布于美国中南部纬度偏北、经度偏东的地区。
Based on the five-year-old pilot plantations of Pinus arboretum provenance from Shanghai, introduced from the United States, the selection of excellent families and elite individuals was conducted based on the results of the trial in late 2004. The results showed that there were obvious genetic differences among pedigrees in different provenances and provenances at Songjiang experimental site. According to the phenotypic selection of 12 elite families, the tree height, breast diameter and volume were 6.5%, 12.31% and 28.54% higher than that of pedigree respectively. Sixteen excellent individuals were selected and their tree height, DBH, single The increment of plant volume was 18.05%, 38.79% and 100.55% respectively, among which the single plant with the largest increase of these three traits increased by 44.07%, 62.91% and 224.92% respectively. The comprehensive selection of excellent families and excellent single plants showed that the materials suitable for Songjiang Point were mostly distributed in the north latitude and the longitude east of the central and southern United States.