Logarithmic slope of temperature dependence of maximal photosynthetic rate (K -1) a maintĬoefficient of maintenance respiration A:Ĭonversion factor from moles of CO 2 to g glucose in photosynthesis b: This process is experimental and the keywords may be updated as the learning algorithm improves. These keywords were added by machine and not by the authors. Details can be tedious but they are largely resolved once and for all. With modern computing facilities even at the level of a personal computer, the resolution is straightforward, with some subtleties. The problem has traditionally been difficult (Anderson and Denmead 1969) but it is far from intractable.
We then turn our attention to predicting PAR irradiance on individual leaves, FL, from radiative-transfer models that typically estimate radiant flux densities (or angularly resolved radiances) at given spatial locations or only as lateral averages over sunflecks and shaded areas.
For the moment, we may ignore the phenomena of temperature dependence of photosynthesis (in which total radiative energy balance plays a key role) and of transient responses in photosynthesis. In order to estimate canopy photosynthesis, P can, one must predict PAR irradiances on all the inclined leaf surfaces and one must have a model for responses of individual leaves to irradiance. The photosynthetic rate of a leaf or a canopy is determined largely by radiation, particularly photosynthetically active radiation, PAR, comprising the 400 to 700 nm band.
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