Assessment of Wood Qualities for Tree Breeding. III. In Pinus radiata D. Don

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Nicholls, J.W.P.; Dadswell, H.E.



Specimens from 131 trees of P. radiata from four populations in Australia have been examined for wood characteristics. The trees had been selected for outstanding form and vigour and a further selection was required on the basis of wood quality. The variation through successive growth rings from the pith, of such features as cell length, micellar angle, basic density, ring width, percentage late wood, longitudinal shrinkage, percentage cellulose content, and incidence of spiral grain has been determined. The growth ring showing the furthest extent of heartwood from the pith has also been recorded. Statistical analyses showed high correlations between cell length and micellar angle, cell length and cellulose content, and ring width and basic density. Correlations between cell length and longitudinal shrinkage, micellar angle and longitudinal shrinkage, ring width and fibre length, and percentage late wood and basic density, though highly significant, were not as great. It is concluded that cell length, basic density, and incidence of spiral grain are the important features which define wood quality in this species. Criteria for selection have been discussed. A method is described whereby the trees from each population can be arranged in order of merit for selected features.

CSIRO. Division of Forest Products; Division of Forest Products Technological Paper; Forestry and Forest Products

This report has been placed on the CSIRO repository and may be made available to persons outside of CSIRO for non commercial purposes, in its entirety and without deletion of disclaimers and copyright information.

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Division of Forest Products Technological Paper

no. 37



Nicholls, J.W.P.; Dadswell, H.E. Assessment of Wood Qualities for Tree Breeding. III. In Pinus radiata D. Don . 1965.

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