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Emergence and Mortality of Douglas-Fir, Western Hemlock, and Western Redcedar Seedlings

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Emergence of natural seedlings on the H. J. Andrews Experimental Forest in west-central Oregon between 1956 and 1967 was irregular from year to year; but most seedlings appeared between April 15 and May 15. Average percentage of first-year mortality was: Douglas-fir 82, western hemlock 97, and western redcedar 95. Major causes of first-year mortality, in percent, were: Douglas-fir--animal 58, weather 27, and disease 6; hemlock--weather 58, disease 21, and animal 11; redcedar--weather 80, animal 8, and disease 2. Cumulative losses of Douglas-fir seedlings, in percent, were: 1 year 83, 2 years 86, 3 years 86, 4 years 88, 5 years 88, and 6 years 89. Seedling protection might be most productive if directed toward animals for Douglas-fir and toward weather for hemlock and redcedar. Forest Sci. 17:230-237.

Keywords: Pseudotsuga menziesii; Thuja plicata; Tsuga heterophylla; animal damage; mortality; natural regeneration

Document Type: Journal Article

Affiliations: Wildlife Research Biologist, Denver Wildlife Research Center, U. S. Bureau of Sport Fisheries and Wildlife, U. S. Forest Service Silviculture Laboratory, Bend, Oregon 97701

Publication date: June 1, 1971

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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