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Simulating Gross Primary Productivity of Humid-Temperate Pastures

^a USDA-ARS, Pasture Systems and Watershed Management Research Lab., Bldg. 3702 Curtin Rd., University Park, PA 16802
^b INRA, Agrocampus Rennes, UMR 1069, Sol, Agro- et hydro-systèmes, Spatialisation, F-35000 Rennes, France
^c Dep. of Biology and Microbiology, AgH 310, P.O. Box 2207B, South Dakota State Univ., Brookings, SD 57007

View larger version (13K): [in this window] [in a new window]   Fig. 1. Observed vs. simulated yearly forage yield for a cool-season grass pasture in central Pennsylvania. Yearly totals are the sum of four to five harvests per year.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Observed vs. simulated yearly gross primary productivity (GPP) for a cool-season grass pasture in central Pennsylvania.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Monthly distribution of measured and simulated gross primary productivity (GPP) for a cool-season grass pasture in central Pennsylvania. Data are averaged over 2004 through 2006 and error bars indicated variability among years ( ± 1 SE).

View larger version (23K): [in this window] [in a new window]   Fig. 4. Daily measured (symbols) and simulated (lines) gross primary productivity (GPP) from 1 January through 31 May of each year. Horizontal bars indicate days when snow cover was >2 cm. Arrows indicate dates when the pasture was grazed.

View larger version (28K): [in this window] [in a new window]   Fig. 5. Influence of air temperature on observed and simulated daily gross primary productivity (GPP) during the first 3 mo of the year.