Simulated Dynamics of Blue Grama Production

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Abstract
The dry matter production of swards of blue grama (Bouteloua gracilis (H.B.K.) Lag.) was modeled using measured affects of soil water potential, temperature, visible irradiance and phenological stage on photosynthesis and respiration. Other data and estimates were utilized to simulate translocation, shoot and root litter accumulation and root respiration. A full growing season (154 days) was simulated using 3 h intervals. Modeled output was validated with other various measures of productivity on the same site throughout the same season. Modeled annual net primary production of 714 g carbohydrate (CH2O) m-2 yr-1 was similar to a measured value of 744 g CH2O m-2 yr-1. A sensitivity analysis of the model demonstrated that predicted primary productivity varied considerably with changes in abiotic conditions and various model constants.