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Tree shadow patterns and illumination measurements with clearcut strips and irregular openings in a true fir forestAuthor(s): Donald T. Gordon
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
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DescriptionDaily 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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CitationGordon, 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
KeywordsShading, protective, seedlings, seedling survival, natural regeneration, forest clearcutting, photorammetry, light, Abies concolor, Abies magnifica
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