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Modeling Interactions among Carbon Dioxide, Nitrogen, and Climate on Energy Exchange of Wheat in a Free Air Carbon Dioxide Experiment

^a Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB, Canada T6G 2H1
^b USDA-ARS, U.S. Water Conserv. Lab., 4331 E. Broadway, Phoenix, AZ 85040
^c Laboratory of Tree Ring Res., Univ. of Arizona, Tucson, AZ
^d Dep. of Soil, Water, and Environ. Sci., Univ. of Arizona, Tucson, AZ

View larger version (17K): [in a new window]   Fig. 1. Hourly averages of air temperature and wind speed from 6 to 10 Mar. 1996 (DOY 66–70) at the FACE site near Phoenix, AZ

View larger version (22K): [in a new window]   Fig. 8. Seasonal time course of (a) aboveground phytomass and (b) LAI measured (symbols) and simulated (lines) under 35 vs. 7 g N m-2 fertilization and 363 vs. 548 µmol mol-1 CO2 concentration

View larger version (31K): [in a new window]   Fig. 2. Hourly averages of net radiation (Rn), latent heat (LE), and sensible heat (S) fluxes measured (symbols ± SE) and simulated (lines) from 6 to 10 Mar. 1996 (DOY 66–70) under 363 µmol mol-1 CO2 and (a) 35 g N m-2 and (b) 7 g N m-2 fertilization. Negative values represent upward fluxes

View larger version (25K): [in a new window]   Fig. 3. Differences in latent and sensible heat fluxes under 548 vs. 363 µmol mol-1 CO2 with (a) 35 g N m-2 and (b) 7 g N m-2 fertilization measured (symbols) and simulated (lines) from 6 to 10 Mar. 1996 (DOY 66–70). Positive values represent reductions in upward fluxes under 548 vs. 363 µmol mol-1 CO2

View larger version (17K): [in a new window]   Fig. 4. Hourly averages of air temperature and wind speed from 24 to 28 Apr. 1996 (DOY 115–119) at the FACE site near Phoenix, AZ

View larger version (33K): [in a new window]   Fig. 5. Hourly averages of net radiation (Rn), latent heat (LE), and sensible heat (S) fluxes measured (symbols ± SE) and simulated (lines) from 24 to 28 Apr. 1996 (DOY 115–119) under 363 µmol mol-1 CO2 and (a) 35 g N m-2 and (b) 7 g N m-2 fertilization. Negative values represent upward fluxes

View larger version (25K): [in a new window]   Fig. 6. Differences in latent and sensible heat fluxes under 548 vs. 363 µmol mol-1 CO2 with (a) 35 g N m-2 and (b) 7 g N m-2 fertilization measured (symbols) and simulated (lines) from 24 to 28 Apr. 1996 (DOY 115–119). Positive values represent reductions in upward fluxes under 548 vs. 363 µmol mol-1 CO2

View larger version (18K): [in a new window]   Fig. 7. Canopy CO2 fluxes measured (symbols) and simulated (lines) on 21 Feb. 1996 under 363 vs. 548 µmol mol-1 CO2 and 35 vs. 7 g N m-2 fertilization