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Lack of agreement among models for estimating the photosynthetic parameters
Author(s) -
Frenette JeanJacques,
Demers Serge,
Legendre Louis,
Dodson Julian
Publication year - 1993
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1993.38.3.0679
Subject(s) - photoinhibition , photosynthesis , exponential function , mathematics , tangent , irradiance , term (time) , range (aeronautics) , hyperbolic function , statistics , physics , mathematical analysis , biology , botany , geometry , optics , materials science , photosystem ii , quantum mechanics , composite material
Comparisons were conducted between estimates of photosynthetic capacity ( P max ) and photosynthetic efficiency ( α ) calculated with different models of the photosynthesis vs. irradiance curve. Values computed on the same data sets are different according to the models used. Estimates for P max with the exponential and hyperbolic tangent models (without a term for photoinhibition) are in good agreement (4% difference). The same comparison for α shows poor agreement (24% difference between the two models). When a parameter for the intercept is added to the two models, the lack of agreement increases to 8% for P max and 46% for α. When the mean photosynthetic parameters calculated with the two models are introduced into various published models for calculating primary production, differences in the resulting estimates range between 20 and 133%. Comparing the exponential model with a term for photoinhibition to the hyperbolic tangent model (without a term for photoinhibition) shows a 24% difference in the estimate of α. Equations are given for transforming values calculated with the various models.