Abstract
Field trials testing a total of 27 clones of the interspecific hybrid Acacia mangium × A. auriculiformis and seedling controls of the parental species were established at Ba Vi and Yen Thanh in the north of Vietnam and Long Thanh in the south. At both Ba Vi and Yen Thanh there were significant (P < 0.001) differences in height and diameter at breast height (DBH) among 22 tested clones at 4 years. At Long Thanh, twelve hybrid clones did not differ significantly in DBH at age 3 years, but did (P < 0.001) at age 5 years. At the two northern sites the acacia hybrid clones had significantly greater DBH than control seedlots of the parental species. At Long Thanh, DBH of the hybrid clones and A. mangium was similar, with a genetically improved seedlot of A. mangium displaying the best DBH. Mean wood basic density at breast height of the acacia hybrid clones was 539 kg m−3 at Yen Thanh at age 8 years, and 473 kg m−3 at Long Thanh at age 5 years; density for A. mangium at Long Thanh was only slightly lower than the hybrid clones at 461 kg m−3. Linear regressions of Pilodyn penetration (PP) at breast height on wood basic density explained 60% of the variance in density of treatments (clones and control seedlots) at Yen Thanh and 36% at Long Thanh. There were significant differences between hybrid clones in PP at all three trial sites. Clonal DBH performance was not strongly correlated across the three trial sites; Pearson correlations of clone mean DBH between pairs of sites ranged from −0.47 to 0.20. Clonal rankings for PP were more stable, with Pearson correlations between pairs of sites ranging from r = 0.71 to 0.78.
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Acknowledgments
We thank staff of the Forest Science Institute of Vietnam, in particular the Research centre for Forest Tree Improvement, for assistance with trial establishment, management and assessment. The Australian Centre for International Agricultural Research supported the study. Drs Chris Beadle, Rod Griffin and Garth Nikles provided helpful comments on an earlier draft of this paper.
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Dinh Kha, L., Harwood, C.E., Kien, N.D. et al. Growth and wood basic density of acacia hybrid clones at three locations in Vietnam. New Forests 43, 13–29 (2012). https://doi.org/10.1007/s11056-011-9263-y
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DOI: https://doi.org/10.1007/s11056-011-9263-y