杉木配合力第1轮回选择的研究 Ⅲ.速生性状的“联合选择”以及杂种优势

Studies on First Recurrent Selection of Combining Ability of Chinese Fir Ⅲ Combined Selection and Hybrid Vigor for Speed growth

对杉木速生性进行联合选择结果表明:第1轮回选择中,基本群体内的表型选择(初选优树)、遗传测定林中的家系选择(逆选优树)和中选家系中的单株选择3个阶段的遗传变异都十分丰富,3阶段联合选择材积的遗传增益可达32.74%～42.13%.在杉木配合力第1轮回选择中,不同的选择方式其选择效应的大小是不同的,进行一般和特殊配合力交互轮回的效果较好,第3阶段选择的增益与选择强度有关,也与利用方式有关.优良单株出现在优良家系中的频率较大,在选择中也发现,有些家系的平均表现一般,但家系内有些个体表现优异.文中还探讨了杉木杂种优势等问题.

The results of combined selections for Chinese fir (Chunninghamia lancecolata Chunninghamia lancecolata Hook ) on speed growth show that the genetic variance among 3 stages of first recurrent selection is abundance, which are the phenotype selection in basis populations, the family selection in genetic tested forests and the individual selection in selection families The genetic gains of the combined selection for volume is up to 32 74%～42 13% in 3 stages The selection effect is different with different selection methods in first recurrent selection for combining ability of Chinese fir For example, the effect is significant for proceeding with SCA selection based on GCA selection, while the genetic gains of the 3th stage is quite relevant to the selection intensity and utilizing way The ratio of super trees among superior families is high, but it also can be found that some of individual is super while this family is general The paper studies the hybrid vigor of Chinese fir, too