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Measurements of solar radiation under spruce and birch canopies reveal significant interception rates, highlighting canopy effects on sunlight distribution.
Solar radiation was measured under the canopies of a coniferous and a hardwood stand and in an open field during May and June 1966. Ninety-two percent of the incoming solar beam was intercepted by the conifers and 83 percent by the hardwood trees when in foliage. Before the advent of leaves in the spring, the hardwoods intercepted 41 percent.
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C. E. Schomaker (1968) studied this question.
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