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Effects of Light Regimes on the Growth of Cherrybark Oak Seedlings

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Abstract:

Light regimes vary significantly within small forest openings, ranging from full sunlight to total shade, and they may affect the establishment and early growth of oak seedlings. We designed modified shadehouses to simulate the complex light conditions within forest openings and tested the effects of daily photosynthetically active radiation (PAR), time of direct light exposure, and the ratio of direct light to day length (direct-sunlight ratio) on height, diameter, and periodic growth of cherrybark oak (Quercus pagoda Raf.) seedlings through 2 yr. Five treatments representing the time of exposure to direct sunlight were created: NO, NOON, MORNING, AFTERNOON, and FULL. Treatments significantly affected both the height and root-collar diameter of seedlings, especially during the second growing season. The direct-sunlight ratio was linearly related to periodic height growth for the NOON treatment but not related to height growth for the other treatments. However, periodic height growth in the AFTERNOON and FULL treatments was highly correlated to mean daily PAR. Maximum periodic height growth occurred at moderate daily PAR levels. This research showed that light conditions for maximum growth of cherrybark oak seedlings change through time, with adequate shading being most favorable during the early stages of establishment. FOR. SCI. 47(2):270–277.

Keywords: Forest openings; Quercus pagoda; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; periodic growth; reproduction; shadehouses

Document Type: Miscellaneous

Affiliations: 1: Assistant Professor School of Forest Resources, University of Arkansas at Monticello, P.O. Box 3468 Monticello, AR, 71656, Phone: (870) 460-1692; Fax: (870) 460-1092 guo@uamont.edu 2: Research Forester Southern Research Station, USDA Forest Service, P.O. Box 3516 Monticello, AR, 71656, Phone: (870) 367-3464 mshelton@fs.fed.us 3: Associate Professor School of Forestry, Wildlife, and Fisheries, Louisiana State University, Baton Rouge, LA, 70803, Phone (225) 388-4131 blockh1@lsu.edu

Publication date: 2001-05-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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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