Abstract
The first generation genetic gains in four second-generation seedling seed orchards of Eucalyptus pellita established at two locations in Indonesia (Kalimantan and Sumatra) were examined by analyzing data on the height, diameter and stem form of the trees during years 1 to 3. The seed orchards each consisted of 60 open-pollinated families: 48–49 families from first-generation plus trees (improved population) and 11–12 families from natural forest (unimproved population). The realized gains for height and diameter were ca. 16 and 19%, respectively. These gains were highly significant and consistent, irrespective of age and location. However, the gains in stem form were much lower (4%) in Kalimantan than in Sumatra (21%) and only significant in the latter, possibly because of the more intensive silvicultural management regimes at the Sumatran sites. The results confirmed that the first-generation tree improvement program for E. pellita has been effective in Indonesia, and that it should provide improved seeds for operational plantation, thus raising their productivity.
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Acknowledgments
The seed orchards analyzed in this study were established by P. T. Inhutani III in South Kalimantan, P. T. Perawang Sukses Perkasa Industri and P. T. Arara Abadi in Riau, in collaboration with the Ministry of Forestry (Indonesia) and the Japan International Cooperation Agency (JICA). The authors gratefully thank to those organizations and their staff for their support.
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Leksono, B., Kurinobu, S. & Ide, Y. Realized genetic gains observed in second generation seedling seed orchards of Eucalyptus pellita in Indonesia. J For Res 13, 110–116 (2008). https://doi.org/10.1007/s10310-008-0061-0
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DOI: https://doi.org/10.1007/s10310-008-0061-0