›› 1982, Vol. 18 ›› Issue (3): 258-265.
• 论文及研究报告 • Previous Articles Next Articles
Zhu Jin-wei,Cui Qi-wu
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Abstract: For establishing the theory of short wave radiation through the forest canopy,in the forest four canopy cases have been considered: 1) all leaves were horizontal to light; 2) all leaves were perpendicular to light; 3) all leaves were inclined with some angle;and 4) all leaves were distributed at random. The intensity of direct lights absorbed by the forest canopy for all leaves with random distribution may be respectively expressed as following: Where Ib——intensity of direct light absorbed by forest canopy; a——reflection coefficient of the leaf; b——absorbent coefficient of the leaf; Fm——leaf area index; Io——intensity of direct light on the forest canopy surface;lo——intensity of direct light under forest canopy;ho——sun elevation angle.The intensity of diffuse light may be expressed respectively as following:Where ∫I′bdω——absorbent intensity of diffuse light from concave by forestcanopy; ω——solid angle; θ——zenith angle; I′b—— absorbent diffuse intensity in some derection of concave; I′o——diffuse indensity on the surface of forest canopy in some direction of concave. The above formulas agree well with the experimental data and therefore may have certain value in practice.
Zhu Jin-wei;Cui Qi-wu. THEORETICAL STUDY ON THE ABSORPTION OF LIGHT BY FOREST CANOPY OF VARIOUS STRUCTURES[J]. , 1982, 18(3): 258-265.
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