Table 1.

Model estimates for annual net CO₂ assimilation, maximum leaf temperature and maximum leaf-to-air vapour pressure difference for a leaf growing at the top of the canopy near Manaus for 2000 and 2040 in the absence of soil water deficits. (For 2040, simulations have been done both with the assumed [CO₂] for 2000 (380 μmol mol⁻¹) and for a more likely [CO₂] around that time of 550 μmol mol⁻¹. Two model assumptions for stomatal conductance g have been invoked: first, with g≡0.6 mol m⁻² s⁻¹ (minimal stomatal limitation); and secondly, and more realistically, with g responding to variations in leaf-to-air vapour pressure deficit and linking with leaf biochemistry according to equation (E5). The most likely values are shown in italics.)

		2000 climate	2040 climate
model run	output parameter	[CO2]=380 μmol mol−1	[CO2]=380 μmol mol−1	[CO2]=550 μmol mol−1
g≡0.6 mol m−2 s−1	annual net CO2 assimilation (mol C m−2 a−1)	287.6	294.8	379.3
	maximum leaf temperature (°C)	34.2	35.8	35.8
	maximum leaf-to-air vapour pressure difference (mmol mol−1)	20.8	26.8	26.8
interactive g from equation (E5)	annual net CO2 assimilation (mol C m−2 a−1)	207.4	188.7	271.1
	maximum leaf temperature (°C)	37.9	39.7	39.7
	maximum leaf-to-air vapour pressure difference (mmol mol−1)	33.0	40.7	40.8