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Growth and Assimilation Rate of Juvenile Northern Red Oak: Effects of Light and Temperature

R. Farmer

Published 1975 in Forestry sciences

ABSTRACT

Open-pollinated progenies from four Pennsylvania and four Tennessee trees were grown in a nursery and in air-conditioned greenhouses under 100 and 25 percent of full sunlight in four temperature regimes: 29°/23°C (day-night), 23°/23°C, 23°/17°C, and 20°/11°C. Mean net assimilation rate (NAR) ranged from 12 g/m²/wk under low light intensity at all temperatures to 25 g/m²/wk under full light at 23°/23°C and 23°/17°C. Under nursery conditions NAR was 24 g/m²/wk. Mean relative growth rate, which was influenced by light and temperature in roughly the same fashion as NAR, ranged from 136 to 253 mg/g/wk. Leaf area ratio decreased from 120 to 200 cm²/g during the first 6 weeks after germination to 50 to 100 cm²/g at final harvest and was highest under low light intensity. Plants grown 4 months under full sunlight at 23°/23°C exhibited four to five flushes of shoot elongation, had leaf area averaging 3,600 cm², and weighed 56 g. Results are applicable to design of nursery systems for producing large, high-quality 1-0 planting stock. Forest Sci. 21:373-381.

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