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United States Department of Agriculture

Agricultural Research Service

Title: Simulation of Leaf and Canopy Photosynthesis of Maize under Elevated Co2 and Various Temperatures

Authors
item Kim, Soo Hyung
item GITZ, DENNIS
item SICHER, RICHARD
item TIMLIN, DENNIS
item BAKER, JEFF
item REDDY, VANGIMALLA

Submitted to: Integrated Biological Systems Conference
Publication Type: Abstract Only
Publication Acceptance Date: April 14, 2003
Publication Date: April 14, 2003
Citation: Kim, S., Gitz, D.C., Sicher Jr, R.C., Timlin, D.J., Baker, J.T., Reddy, V. 2003. Simulation of leaf and canopy photosynthesis of maize under elevated co2 and various temperatures. Integrated Biological Systems Conference. P. 53.

Technical Abstract: A coupled model of photosynthesis, leaf conductance, and transpiration was developed for maize leaves. The model was based on a biochemical model of C4 photosynthesis, the Ball, Woodrow, and Berry's model of stomatal conductance and the energy balance model. The model was calibrated using maize plants grown at two CO2 and five temperature regimes in Soil-Plant-Atmosphere-Research (SPAR) chambers. This leaf model was extended to predict whole-canopy photosynthesis and transpiration by combining with a radiative transfer model inside the canopy. The whole-canopy gas exchange simulations were compared with whole-canopy gas exchange measurements. Effects of elevated CO2 and increased temperature on photosynthesis and water use were evaluated using the canopy gas exchange model. Effect of shade curtains surrounding the canopy in the SPAR chambers was demonstrated using the model. Incorporation of the gas exchange model into a crop simulation model, including carbon and water balances, and phenology is discussed.

Last Modified: 7/28/2014
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