Temperature Action and Interaction of Temperature Regimes in the Growth of Red Fir Seedlings
Abstract:Abies magnifica (A. Murr.) seedlings were grown under controlled environments with 15 combinations of day and night temperature. The coefficient of variability for both height growth and dry weight was large within each treatment, probably because of genetic differences, which averaged about 30 percent for the trees in the treatments. Four phases of the temperature complex of the environment, total daily degree-hours, day temperature, night temperature, and thermoperiodicity--both independently and through their interaction--affected growth and dry weight production. Height growth was favored by a larger heat sum than was dry weight production. A thermoperiodicity of 13°C produced the tallest and heaviest plants. Maximum height growth required warmer days than nights. However, warmer nights than days increased dry weight production, relative to height growth, provided the heat sum exceeded 300 daily degree-hours. The day-night temperature relationship affected height, stem basal area at ground level, and branch growth, which resulted in the tallest group of plants not being the heaviest.
Document Type: Journal Article
Affiliations: Senior Research Fellow, The California Inst. of Technology, Pasadena, Calif., Dept of Botany, Duke Univ., Durham N. C.
Publication date: 1966-03-01
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