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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

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