Abstract
The sensitivity of canopy climate to the air's CO2 level increment is investigated using a canopy flow model based on the mean turbulent field (MTF) closure models. Leaf processes in the model are highly parametrized using the experimental results obtained from the dependence of stomatal diffusion resistance on the CO2 level. An increase in stomatal resistance with the CO2-level was greater in C4 plants (maize) than in C3 plants (rice), indicating that changes in maize canopy climate are more significant than in rice canopy. In a model maize canopy, daily sensible heat loss increased along with CO2 levels, with concomitant decreases in daily latentheatloss. Somewhat hotter and drier air conditions within maize canopies at higher CO2-level are anticipated to be unfavorable for the growth and yield of maize crops.
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