| In this paper, the genetic variation on growth traits of a Castanopsis fisa half-sib family plantation were studied. The results showed that there were extremely significant differences among families on the tree height (H),diameter at breast height (DBH), individual tree volume (V), crown diameter (CD) and the ratio of crown diameter to H(RCDH), except for the ratio of crown diameter to DBH (RCDDBH). The family heritability of all traits were higher than 0.50, it indicated that an extensive selection potential existed among families. For the given traits, many of them had significant positive phenotypic and genetic correlations among each other, which was favorable for the comprehensive selection with multi -traits. On the base of traits-combining selection, a selection index equation was introduced(I=8.9527X1+2.9906X2+2111.6762X3+6.1398X4-9.3236X5). At the selection rate of 10%, two superior families were chosen.Compared the trait mean of two selected families with that of plantation, the expected genetic gains on H, DBH, V, CD,RCDH, and RCDDBH were 14.18%, 23.33%, 45.24%, 23.25%, 6.72, and -0.67%. More genetic gains were expected when compared the trait mean of selected families with that of control (CK), the expected values were 20.55%, 28.89%, 48.92%,21.97%, 5.16%, and -3.91%, respectively. |
