The growth and stem form variation of Acacia mangium Wild in 2nd generation progeny trial
Keywords:
heritability, Acacia mangium, genetic variationAbstract
Acacia mangium is the main commerce plantation species in Vietnam, research on this species improvement should provide seed resource with high volumn tree, good stem form and suitable in forestry restructural. The research results of growth and stem form variance between families of 2 nd generation progeny trial in Song May - Vinh Cuu - Dong Nai showed that the diameter, height, volumn, stem form of tree were significant difference; the best growth of 10 families (71,
40, 74, 45, 83, 59, 58, 51, 42, 46) were volumn average of stem exceed 50% the volumn average of stem in progeny trial and exceed 130% the worse growth of 10 families. In the some families that belong to moderate growth group still include good individuals with high volumn and good stem form; therefor, selecting good individuals is the real value in tree improvement. Narrow sense hertitability for diameter, stem straightness was moderate (0.17 - 0.20) while it was low for height and branch size. At 20 months old, the progeny trial requires the thinning (cut 1 in 3 tree/family) to subsequently convert to the 2nd generation seedling seed orchard, that provide improved seed in the future.
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