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

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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.

Keywords: Growth analysis; Quercus rubra; episodic shoot elongation; genetic variation

Document Type: Journal Article

Affiliations: Plant Physiologist, Division of Forestry, Fisheries, and Wildlife Development, Tennessee Valley Authority, Norris, Tennessee

Publication date: 1975-12-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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