Figure 2.

Simulated (a) and experimental (b) dependences of the average photosynthetic CO₂ assimilation rate (A_hv) on the intensity of the photosynthetic active radiation (PAR) at the varied average leaf CO₂ conductance (g_S). Simulated dependences were calculated at average g_S = 0.064 mol m⁻²s⁻¹ (the basic g_S) and g_S = 0.023 mol m⁻²s⁻¹ (the decreased g_S). Each stomata in the model was located in the center of square (3 × 3 elements); the average gS was calculated as the CO₂ conductance in the element with stomata divided by 9. In order to obtain experimental dependences, all experimental records in this series were ranged and divided into two groups with the low (g_S < 0.04 mol m⁻²s⁻¹, n = 5) and high (g_S > 0.04 mol m⁻²s⁻¹, n = 9) CO₂ conductance (see Section 5.1). A combination of Dual-PAM-300 and GFS-3000 was used in the experimental measurements of pea seedlings.