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The reflection of short‐wave radiation by vegetation
Author(s) -
Monteith J. L.
Publication year - 1959
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708536607
Subject(s) - photosynthetically active radiation , vegetation (pathology) , reflection (computer programming) , environmental science , spring (device) , radiation , crop , shading , atmospheric sciences , agronomy , remote sensing , geography , geology , physics , optics , botany , biology , photosynthesis , medicine , art , pathology , computer science , visual arts , programming language , thermodynamics
The fraction of short‐wave radiation reflected from agricultural crops was measured from May till September 1958 using two portable solarimetric thermopiles. Maximum reflection coefficients for grass, lucerne, potatoes, sugar beet, and spring wheat were between 0·25 and 0·27. Lower values found in the early stages of crop development, and for spring wheat even at maturity, can be correlated with low leaf areas and mutual shading of the leaves, also reduced reflection. Data by Billings and Morris (1951) have been used to compute total reflection coefficients for different types of vegetation including two desert species and to explain why these do not normally differ as much as the coefficients for the visible component.