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Notes: Effects of Light Intensity and Temperature on the Growth of Douglas-Fir and Incense-Cedar Seedlings

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Seedlings of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and incense-cedar (Calocedrus decurrens [Torr.] Florin) were grown together in six moist growth-chamber environments to compare growth in warm and cool temperatures, determine relative shade tolerances, and investigate the effects of temperature on shade tolerance. Incense-cedar grew larger than Douglas-fir in cool temperatures under all three light intensities used (5, 24, and 420 E.m-2.s-t), but Douglas-fir grew as large or larger than incense-cedar in warm temperatures under light intensities of 24 and 420 E. The relative allocation of growth to shoots and roots was allometric and similar for warm and cool temperatures under 24 and 420 E in the incense-cedar seedlings but not in the Douglas-fir seedlings. Incense-cedar seedlings were more shade tolerant than Douglas-fir seedlings. High temperatures reduced the shade tolerances of both species. For. Sci. 34(1):215-223.

Keywords: Autecology; germination; growth chamber; shade tolerance; survival

Document Type: Miscellaneous

Affiliations: Plant Ecologist, USDA Forest Service, Pacific Northwest Research Station, Forestry Sciences Laboratory, 3200 Jefferson Way, Corvallis, OR 97331

Publication date: 1988-03-01

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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