Temperature Affects Growth and Development of Engelmann Spruce
Abstract:Seedlings of Engelmann spruce (Picea engelmannii Parry)--a high-altitude, cold-climate species--were grown under 30 combinations of day and night temperatures. Growth responses were determined in terms of height, diameter, dry weight of tops and roots, terminal bud development, and number of lateral branches. Night temperature was the most important factor in increasing all aspects of growth except terminal bud formation, which was controlled more by day temperatures. Increasing night temperature within the range of 3 to 23°C increased growth even when the night temperature exceeded day temperatures. Day temperatures of both 19 and 23° with a 23° night temperature produced significantly better growth than any of the other 28 combinations of temperatures. The 35° day temperature tended to inhibit terminal bud formation. This temperature also caused the highest mortality--especially in combination with a 3° or 7° night temperature. These responses are compared to those of redwood (Sequoia sempervirens (D. Don) Endl.) obtained in previous studies. Forest Sci. 16:447-452.
Document Type: Journal Article
Affiliations: Rocky Mountain Forest and Range Exp. Sta., USDA Forest Serv., Fort Collins, Colo. 80521
Publication date: 1970-12-01
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