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The Chilling Requirement of Western Hemlock Seedlings

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Many tree species in temperate zones require a period of low temperatures to overcome dormancy. When seedlings of western hemlock were preconditioned with 6 wks of mild, short days, their chilling requirement was met by 4 wks of a constant 5°C temperature, considerably less chilling than required by Douglas-fir. Seedlings not receiving this beneficial pretreatment generally required 6-8 wks of constant chilling to break bud. Even so, western hemlock had a lesser requirement than Douglas-fir for short mild days before chilling. These pretreatment effects and chilling requirement have implications for improving the nursery production of western hemlock seedings. Forest Sci. 25:485-490.

Keywords: Tsuga heterophylla; container seedlings; dormancy; seedling production

Document Type: Journal Article

Affiliations: Professor of Forest Science, School of Forestry, Oregon State University, Corvallis, OR 97331

Publication date: September 1, 1979

More about this publication?
  • 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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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