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

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