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. 2017 Mar 31;68(9):2345–2360. doi: 10.1093/jxb/erx085

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© The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 2. — Calculated daily canopy photosynthesis of the default C₃ (0) and nine (1–9) photosynthesis-enhancing routes in response to daily incoming global solar radiation, for four different sizes of canopy [leaf area index (LAI) = 1, 3, 5, and 7, respectively]. The calculation was made using the model described in the text, based on parameter values listed in Tables 1 and 2 and the following input conditions: C_a = 400 μmol mol⁻¹, T_l = 25 °C, canopy average leaf nitrogen = 2.3 g m⁻², n_b = 0.3 g m⁻², VPD = 2.0 kPa, daylength = 13 h d⁻¹, fraction of diffuse irradiance = 0.2, and canopy average leaf angle (from horizontal) = 65 °. Light extinction coefficient and nitrogen extinction coefficient required for the canopy photosynthesis model were calculated using the formulae as in GECROS with leaf scattering coefficient of 0.2 for PAR.