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Albany, Australia

Meder R.,CSlRO Plant Industry | Downes G.,CSIRO | Brawner J.,CSlRO Plant Industry | England N.,Elders Forestry Ltd
Appita Annual Conference

The routine use of near infrared spectroscopy as a tool for the determination of Kraft pulp yield in standing trees still requires some issues to be overcome before it gains acceptance within the forestry community. This paper discusses the work that has gone on in developing in-field NIR tools for KPY assessment and also discusses the hurdles that are to be overcome. Robust portable NIR instruments are now commercially available and can be used confidently by trained field technicians to make meaningful measurements of wood properties. But an understanding of wood property variation and the handling of NIR instruments is needed to avoid errors in data collection and subsequent interpretation. Source

Callister A.N.,University of Melbourne | England N.,Elders Forestry Ltd | Collins S.,Elders Forestry Ltd
Canadian Journal of Forest Research

Eucalyptus globulus Labill. is increasingly considered for supply of solid-wood products such as sawlogs, yet genetic studies of solid-wood traits have been lacking. We estimated genetic parameters of growth and form traits that affect log value in full-sib families from two advanced-generation breeding populations on eight sites in Western Australia. Mean single-site heritability was 0.11 ± 0.01 for diameter at breast height (DBH), 0.28 ± 0.05 for stem straightness, 0.09 ± 0.02 for branch thickness, and 0.05 ± 0.02 for forking incidence. Dominance effects were significant (p < 0.05) at four sites for DBH and branch thickness and at three sites (one population) for straightness. Mean intersite additive genetic correlations were 0.76 ± 0.06 for DBH (n = 7), 0.75 ± 0.11 for stem straightness (n = 7), and 0.58 ± 0.07 for branch thickness (n = 4). Mean intersite dominance genetic correlations were 0.90 ± 0.04 for DBH (n = 7), 0.26 ± 0.27 (n = 4) for straightness, and 0.68 ± 0.11 for branch thickness (n = 3). Additive genetic correlations between DBH and straightness ranged from - 0.71 ± 0.23 to 0.33 ± 0.19 with an average of - 0.18 ± 0.12 (n = 8). Genetic correlations between DBH and branch thickness were mostly weak although straightness was generally associated with thinner branches (mean additive correlation 0.44 ± 0.15, n = 6). We conclude that prospects appear favourable for improving the solid-wood value of E. globulus by selection and breeding. Source

Callister A.N.,Treehouse Consulting | Callister A.N.,University of Melbourne | Callister A.N.,University of Western Australia | England N.,Elders Forestry Ltd | Collins S.,Elders Forestry Ltd
Tree Genetics and Genomes

Realised gains in stand volume of Eucalyptus globulus Labill. families at 7-9 years were compared with gains predicted at 3. 5 years. Gain predictions were based on height, diameter at breast height (DBH), sectional area, and stem volume for 153 full-sib families and 18 commercial checks in five-tree line plots on three West Australian sites. Single-site narrow-sense heritability estimates were 0. 12-0. 24 for height, 0. 08-0. 12 for DBH, 0. 09-0. 13 for sectional area, and 0. 14-0. 19 for stem volume. Genetic dominance effects were significant (p & 0. 05) in most cases, and the estimated dominance/additive genetic variance ratio was heterogeneous for height and DBH. Stand volume was measured for 93 of the same families and checks in 40-tree block plots on four sites. Heritability of stand volume was 0. 25-0. 76, with an across-sites estimate of 0. 41. Dominance effects were statistically absent at two sites. Estimated region-wide additive genetic correlations between selection traits (in line plots) and stand volume (in block plots) ranged from 0. 86 to 0. 90. Estimated stand volume gain was 23 % of the mean for the best 12 % of families and 14 % of the mean for the best 24 % of families. Realised gain was under-estimated by predictions based on height, DBH, and sectional area, which had smaller coefficients of additive variation than did stem volume. It is concluded that although BLUP analysis of early-age height and DBH can provide for indirect selection on E. globulus stand volume, analysis of stem volume is required to predict genetic gain at an appropriate scale. © 2012 Springer-Verlag. Source

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