Joining Leaf Photosynthesis Models and Canopy Photon-Transport Models

摘要: The photosynthetic rate of a leaf or canopy is determined largely by radiation, particularly photosynthetically active PAR, comprising the 400 to 700 nm band. In order estimate photosynthesis, Pcan, one must predict PAR irradiances on all inclined surfaces and have model for responses individual leaves irradiance. For moment, we may ignore phenomena temperature dependence photosynthesis (in which total radiative energy balance plays key role) transient in photosynthesis. We then turn our attention predicting irradiance leaves, FL, from radiative-transfer models that typically radiant flux densities (or angularly resolved radiances) at given spatial locations only as lateral averages over sunflecks shaded areas. problem has traditionally been difficult (Anderson Denmead 1969) but it far intractable. With modern computing facilities even level personal computer, resolution straightforward, with some subtleties. Details can be tedious they are once all.