Time Trends in Genetic Control of Height Growth in Ponderosa Pine
Height growth in ponderosa pine plantation with 71 families in 7 elevational zone sources was analyzed at ages 3, 5, 7, 8, 12, 20, 25, and 29. Height growth varied by seed source zone and by family within zone. Zonal variances were well established at an early age, and the differences were maintained with minor variations through the study period. Family variances were smaller than zonal and environmental variances, the differences were not well correlated between the earlier and later phases, and the correlations were sometimes negative. Three observed growth phases, related to ecological dominance and competition, affected the levels of variance attributable to genetics and environment. Forest Sci. 22:2-12.
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Document Type: Journal Article
Affiliations: Geneticist, Pacific Southwest Forest & Range Exp. Stn., Forest Service, USDA, Berkeley, California
Publication date: 1976-03-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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