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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.
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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: 01 March 1988

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