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Evaluating a Leaf-Level Canopy Assimilation Model Linked to 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
^d Centre de recherche et de développement sur les sols et les grandes cultures, Agric. and Agri-Food Canada, Sainte-Foy, QC G1V 2J3, Canada
^e School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE 68583-0728

View larger version (20K): [in a new window]   Fig. 1. Measured and simulated instantaneous leaf assimilation on leaf 13th of hybrid P3489 grown in Mead, NE, in 1995. Each data point is the average and standard error of three to five consecutive measurements. Corrections for vapor pressure deficit (VPD, broken line) above 1 kPa were obtained with a linear relationship developed by Boedhram (1998).

View larger version (19K): [in a new window]   Fig. 2. Relationship between transpiration rate and photosynthetic photon flux density for the field measurements depicted in Fig. 1 (Moreno-Sotomayor et al., 2002).

View larger version (30K): [in a new window]   Fig. 3. Daily progression of measured and simulated intercepted photosynthetically active radiation and canopy net assimilation of hybrid Pride K 127 grown in Nepean, ON, in 1993. Simulations used daily inputs of solar radiation that the model converts in hourly values of PAR following a sinusoidal function.

View larger version (30K): [in a new window]   Fig. 4. Daily progression of measured and simulated intercepted photosynthetically active radiation and canopy net assimilation of hybrid Pride K 127 grown in Nepean, ON, in 1993. Simulations used on-site measured hourly PAR values.

View larger version (34K): [in a new window]   Fig. 5. Seasonal progression of measured and simulated leaf area index and shoot biomass of six hybrids planted within a latitudinal range of 45 to 21° N.

View larger version (24K): [in a new window]   Fig. 6. Sensitivity analysis of CERES-PR to relative changes in model parameters associated with light capture (closed symbols), photosynthesis and respiration (open symbols), and temperature (gray symbols). Parameters reported are as follows: (average leaf angle); H (potential canopy height); X (parameter dictating leaf angle distribution according to Campbell, 1986); rp (hourly maintenance respiration per unit of gross assimilation); rg (hourly maintenance respiration per unit of dry weight growth); ka (slope parameter dictating reduction of leaf assimilation with age); ast (temperature effect on light saturated assimilation, Asat); and rmt (temperature effect on maintenance respiration).