Genetic variation in early growth, stem straightness and survival in Acacia crassicarpa, A. mangium and Eucalyptus urophylla in Bukidnon Province, Philippines
2003
Arnold, R. J. | Cuevas, E.
Results are reported from three provenance-family trials, one of Acacia crassicarpa, one of A. mangium and one of Eucalyptus urophyUa, established in Bukidnon province on the southern Philippine island of Mindanao. All trials contained seedlots representing the species natural geographic wide ranges and the A. mangium trial also included some seed orchard seedlots. Average growth at approximately age three years ranged from 9.3 m height with diameter at breast height (dbh) of 8.0 cm for E. urophyUa up to 10.9 m height and 12.2 cm dbh for A. mangium. Eucalyptus urophyUa showed good average stem straightness whilst both A.mangium and A. crassicarpa had relatively poor stem straightness. In A. crassicarpa there were significant differences between both provenances and families-withinprovenances for dbh and survival. In A. mangium, there were significant differences between regions, provenances-within-region and families-within-provenance for dbh,and between regions and families-within-provenance for stem straightness. The only significant differences for survival in A. mangium were those between provenancewithin-region. Significant differences were found between provenances of E. urophyUafor dbh, straightness and survival. However, these were much smaller than the differences between families-within-provenances for these traits. Estimates of individual tree heritabilities for growth traits and stem straightness were low to very low (0.07 to 0.15) for the three species, with the exception of straightness in A. crassicarpa which was moderate (0.25).
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
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