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| Main traits observation of young growth family andsuperior family selection of Neolamarckia cadamba |
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| Abstract: |
| Forty trees of Neolamarckia cadamba were chosen from Yunnan，Guangxi and Guangdong province
in 2011，and then contrast test was performed through family afforestation in May 2014. The results from survey in
Jan 2015 showed that there were extremely significant differences among families on the tree height（H），ground
diameter（GD），individual tree volume（V），height under branch（BH），crown diameter（CD）， the ratio
of crown diameter to ground diameter（RCDGD），and the ratio of height to height under branch（RHBH）. The
family heritability of all traits were higher than 0.50，which indicated that an extensive selection potential existed
among families. For the given traits，many of them had significant positive phenotypic and genetic correlations with
each other，which were favorable for the comprehensive selection with multi-traits. On the base of traits -combining
selection，a selection index equation was constructed. Under 10% selection pressure，four superior families were
chosen. Compared with the trait mean of control（CK），the expected genetic gains on H，GD，V，BH，CD，RCDGD
and RHBH of the four selected families were 17.34%，20.49%，46.20%，20.39%，13.47%，2.45% and -8.95%，
respectively. |
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