Title
A computerized numerical experimental study of average solar radiation penetration in plant stands A computerized numerical experimental study of average solar radiation penetration in plant stands
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Oxford ,
Subject
Chemistry
Source (journal)
Journal of quantitative spectroscopy and radiative transfer. - Oxford
Volume/pages
49(1993) :6 , p. 651-658
ISSN
0022-4073
ISI
A1993LG39800007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
An important problem in radiation measurements is the averaging of radiant fluxes in horizontal directions. The use of downward cumulative foliage-areal index averaged over a horizontal surface for the calculation of the average penetration of solar radiation in a plant stand underestimates penetration unless the stand is horizontally uniform. Using a computerised numerical experiment method we show that the underestimation of penetration varies with the downward cumulative foliage-areal index, the extinction coefficient, as well as the foliage distribution pattern. The results show that the underestimation is strongly pronounced for some combinations of extinction coefficient and foliage-areal index. It is also shown that the use of a penetration value averaged over a horizontal surface (P(AP)) to invert the stand foliage-areal index (LAI) by means of the logarithm formula LAI = -ln(P(AP))/k can cause large underestimation of LAI, especially in the case of large LAI. Numerical results are presented in this paper to provide a basis for calibration.
E-info
https://repository.uantwerpen.be/docman/iruaauth/376bbb/c904881.pdf
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Handle