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    Author(s): Donald T. Gordon
    Date: 1968
    Source: Res. Note PSW-RN-172. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 9 p
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (1.46 MB)

    Description

    Daily progression of shadows cast by red and white fir trees in forest stand openings is illustrated by vertical aerial photographs made on the summer solstice at 2-hour intervals from 7 a.m. to 5 p.m. The aerial photos show shade patterns in three irregularly - shaped, natural stand openings and two different widths (3-chains and 5-chains) of clearcut strips. Illumination measurements are reported to aid interpretation of shadow patterns.

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    Citation

    Gordon, Donald T. 1968. Tree shadow patterns and illumination measurements with clearcut strips and irregular openings in a true fir forest. Res. Note PSW-RN-172. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 9 p

    Keywords

    Shading, protective, seedlings, seedling survival, natural regeneration, forest clearcutting, photorammetry, light, Abies concolor, Abies magnifica

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