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Heartwood production in a 35-year-old black walnut progeny test

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Abstract:

A 35-year-old black walnut (Juglans nigra L.) progeny test was evaluated for growth and production of heartwood. The test trees, which were open-pollinated progeny of select females in seven states, were planted on a good-quality, uniform site in Wabash County, central Indiana, U.S.A. Increment cores were used to estimate the amount of heartwood at 1.3 m above ground level. There were significant differences among open-pollinated families (α = 0.10) for both area of heartwood and percent area of heartwood. Narrow-sense heritability estimates for these traits were moderate (0.40 and 0.27), indicating opportunity for gain from selection. Faster growing trees had more heartwood and a higher percentage of heartwood area in cross section. Genetic correlations indicated that the rate and amount of heartwood formation is closely related to diameter growth.

La croissance et la production de bois de cœur ont été évaluées dans un test de descendance de noyers noirs (Juglans nigra L.) âgés de 35 ans. Les arbres testés, qui sont issus de la pollinisation libre d'arbres femelles sélectionnés dans sept états, ont été plantés sur un site homogène de bonne qualité dans le comté de Wabash, dans le centre de l'Indiana aux États-Unis. Des carottes ont été utilisées pour estimer la quantité de bois de cœur à 1,3 m au-dessus du niveau du sol. Il y a des différences significatives (α = 0,10) entre les familles à pollinisation libre tant pour la surface de bois de cœur que pour le pourcentage de la surface occupée par le bois de cœur. Les estimations de l'héritabilité au sens strict pour ces caractères sont modérées (0,40 et 0,27), indiquant qu'il serait possible d'obtenir un gain par la sélection. Les arbres à croissance rapide ont plus de bois de cœur, et une plus forte proportion de bois de cœur en section radiale. Les corrélations génétiques indiquent que le taux de formation et la quantité de bois de cœur sont étroitement reliés à la croissance en diamètre.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2002

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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