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Development of a Leaf-Level Canopy Assimilation Model for CERES-Maize

^a Agronomy Dep., Univ. of Florida, Gainesville, FL 32611-0500
^b Dep. of Agricultural and Biological Engineering, 100 Howell Hall, Mississippi State Univ., Mississippi State, MS 39762
^c Dep. of Agronomy, Iowa State Univ., Ames IA 50011

View larger version (17K): [in a new window]   Fig. 1. Measured and simulated canopy height and leaf area index of maize cultivar GL 420, 5.6 plants m–2, on 1991. Original data from Lizaso (1993).

View larger version (20K): [in a new window]   Fig. 2. Relationship between leaf length and leaf area for individual leaves that have completed at least 80% of expansion.

View larger version (28K): [in a new window]   Fig. 3. Field measured and model simulated fraction of intercepted PAR. Measurements were done around 1200 h in north–south oriented rows (Westgate et al., 1997). Simulations were done at 1200 h with various average angles of expanded leaves (, Eq. [11]). Optimum (minimum RMSE) was 64°. Vertical lines are standard errors.

View larger version (15K): [in a new window]   Fig. 4. Effect of leaf age on light response curve parameters: green leaf area simulated for the specified leaf and corresponding light response curve parameters.

View larger version (22K): [in a new window]   Fig. 5. Photosynthetic light response curves simulated for the specified leaf at selected thermal times after emergence (GDD8).

View larger version (19K): [in a new window]   Fig. 6. Relative effect of temperature (Eq. [44]) on light response curve parameters, and simulated leaf assimilation curves at selected temperatures when leaf expansion is completed (original data from Oberhuber and Edwards, 1993). Parameters are: Asat, saturated assimilation rate (µmol CO2 m–2 leaf s–1); , quantum efficiency of CO2 assimilation [µmol CO2 (µmol quanta)–1]; , curvature (unitless). Dashed lines correspond to 40 and 45°C.

View larger version (23K): [in a new window]   Fig. 7. Simulated seasonal progression of canopy gross assimilation and respiration with CERES-PR for hybrid Pioneer 3790, planted in Morris, MN, in 1986 at 5.4 plants m–2.

View larger version (19K): [in a new window]   Fig. 8. Simulated seasonal progression of potential growth rate and measured and simulated leaf area index and aboveground biomass as predicted with CERES-Maize and with CERES-PR for hybrid Pioneer 3790, planted in Morris, MN, in 1986 at 5.4 plants m–2.