Analysis of Differences in Height Growth among Populations in a Nursery Selection Study of Douglas-Fir
Authors: Overton, W. S.; Ching, Kim K.
Source: Forest Science, Volume 24, Number 4, 1 December 1978 , pp. 497-509(13)
Publisher: Society of American Foresters
Abstract:Douglas-fir seedlings selected for superior height and branchiness were outplanted and tested for height growth performance against control seedlings representing the nursery population. Analyses are reported of height to plantation age of 9 years. Seedlings with superior height at planting maintained height advantage, but did not exhibit greater growth rate at height than control seedlings. Seedlings with greater branchiness grew faster early, the height advantage persisted, but the growth rate advantage did not. The primary advantage to both selection criteria is shorter time to 76.2 cm (30 inches) height, this representing virtual escape from animal damage and vegetative competition. Height at 5 years past 76.2 cm showed no significant differences due to either factor. It is suspected that the differences in nursery performance, on which the selection was based, are cultural rather than genetic. Forest Sci. 24:497-509.
Document Type: Journal Article
Affiliations: Professor of Forest Genetics, Department of Forest Science, School of Forestry, Oregon State University, Corvallis, OR 97331
Publication date: 1978-12-01
- 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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