<正>我国第一批杉木二代家系区域试验黄山试点３９个家系幼林阶段的调查分析表明，二代家系具较高生产力水平，但家系间差异显著，在二代家系中再选择、推广，仍具有较大的增产潜力，其中１６个家系树高、胸径、材积的遗传增益期望值分别达６．２２％～１１．４３％、８．８６％～２５．３６％和２１．４３％～５３．７６％，家系间生长量与抗雪压倒伏能力极显著相关，为杉木生长性状与抗雪压能力开展联合选择提供了可能。

The region tests of the second_generation seletions were arranged in the main distribution of Chinese fir in China in 1992. The results of studies on 39 families of the early stage in the site of Huangshan showed that the families of the second_generation improvement had a good production level, but the difference of growth among families was significant, so re_selection from the families of the second_generation and then generalization would bring good potential of increase of growth. The expected genetic gains of height, dbh and volume of 16 re_selectecl families would be 6.22％～11.43％，8.86％～25.36％ and 21.43％～53.76％ respectively. The correlation between the growth of family and the ability of anti_snow damage was at 0.01 level, so it was possible for the joint selection of growth and anti_snow. 