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Variation in specific gravity of red alder (Alnus rubra Bong.)

Variation in specific gravity of red alder (Alnus rubra Bong.)

Canadian Journal of Forest Research 10(3): 293-299

Specific gravity of breast-high wood did not vary significantly among ten 9 yr old sources used in an A. rubra (Bong.) provenance trial. Correlations between specific gravity and diameter were also nonsignificant. In a study of 7 natural stands selected to cover a range of site conditions, specific gravity did not differ among stands and was not correlated with 25 yr radius in 6 of the 7 stands. Analyses of 3-5 ring samples from trees selected from the natural stands revealed no consistent relationships between specific gravity and age or distance from the pith. The correlations between specific gravity and ring width or ring area (measured on the 3-5 ring samples) were negative and highly significant; however, the actual values of the correlation coefficients were quite low (r = 0.21, r = -0.20). Individual tree selection for growth rate or silvicultural treatments to increase growth will probably have little influence on specific gravity. The uniform specific gravity of wood from stands of varying ages and different locations is a desirable feature in the wood and fiber industries.

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Accession: 001030492

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DOI: 10.1139/x80-050

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