Biochemical model estimated net photosynthetic rate at existing PAR levels above each leaf layer in the
canopy and at the two CO2concentrations are given in Fig. 5. Estimated net photosynthetic rates increased from the bottom to top
leaf strata of the canopy and that at the higher CO2concentration
was greater than the lower CO2concentration. However, the biochemical model was less sensitive when estimating A at PAR levels
below 100 mol m−2
s
−1