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Solar Radiation Beneath Conifer Canopies in Relation to Crown Closure

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Observations were made in Quebec on solar radiation available daily below canopies of Abies balsamea L. (Mill.), Pinus resinosa Ait., and Pinus banksiana Lamb. during summer and winter with Bellani radiation integrators. A relationship between crown closure and the solar radiation ratio--defined as the proportion, in percent, of the amount of solar radiation available beneath canopy (in langleys), to that available in the open-- was calculated for a wide range of crown closures. Variations in solar radiation in the open did not change the average ratio in the stands, but with increasing radiation in the open the scatter of values around the mean of daily solar radiation-ratios decreased. This suggested the feasibility of a short-cut method for estimating the average solar radiation ratio in coniferous stands by integrating solar radiation on a few calm and clear days. Results are discussed in relation to the radiation-intercepting properties of forest canopies, the solar radiation requirements of Abies balsamea seedlings, and silvicultural management.

Document Type: Journal Article

Affiliations: Research Officers, Forest Research Branch, Dept. of Forestry, Canada, Sillery, P.Q.

Publication date: 1964-12-01

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.

    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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