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Research Note
Title: Tree shadow patterns and illumination measurements with clearcut strips and irregular openings in a true fir forest
Author: Gordon, Donald T.
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
Station ID: RN-PSW-172
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.
Keywords: Shading, protective, seedlings, seedling survival, natural regeneration, forest clearcutting, photorammetry, light, Abies concolor, Abies magnifica
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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.