Table 7.

The coefficients with their probability of significance of linear regression of 31 year average simulated PLUE (overall photosynthetic light-use efficiency as defined in Table 6) against three biochemical parameters (χ_gbs25, ATP_req, and χ_Jmax25, representing the strength of the CCM, quantum requirement, and photosynthetic capacity, respectively) used in the C₄ photosynthesis model, for four cases where potential or water-limited environments were combined with present or 2050 climate conditions

	Potential level				Water-limited level
	Present climate		2050 climate		Present climate		2050 climate
	Coefficient	Probability	Coefficient	Probability	Coefficient	Probability	Coefficient	Probability
Intercept	11.674	1.45 × 10–11	12.108	2.67 × 10–12	9.019	2.31 × 10–12	9.385	1.49 × 10–14
Nanjinga	0.097	0.56	0.102	0.50	–0.078	0.48	–0.112	0.15
Shizukuishia	0.167	0.32	0.415	0.01	–0.200	0.09	–0.051	0.49
χgbs25	–12.751	1.64 × 10–7	–10.574	3.91 × 10–7	–10.262	1.84 × 10–8	–8.406	2.23 × 10–9
ATPreqb	–1.237	1.22 × 10–7	–1.244	3.46 × 10–8	–0.659	1.24 × 10–6	–0.676	1.40 × 10–8
χJmax25	0.0162	7.37 × 10–8	0.0150	5.12 × 10–8	0.0083	1.22 × 10–6	0.0072	7.76 × 10–8
R 2	0.963		0.965		0.961		0.976
Data points	18		18		18		18

^a Site was included as the covariate in regression, with Los Baños as the reference having a coefficient of zero.

^b Total ATP requirement per CO₂ assimilated (= 3 + φ), i.e. 5 for C₄ photosynthesis and 3.75 for cyanobacterial photosynthesis (see the text).