Simulated dynamics of blue grama production.
Abstract
DM production of swards of Bouteloua gracilis was modelled using measured effects 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. Modelled output was validated with other various measures of productivity on the same site throughout the same season. Modelled annual net primary production of 714 g carbohydrate/m2 year was similar to the measured value of 744 g carbohydrate/m2 year. A sensitivity analysis of the model demonstrated that predicted primary productivity varied considerably with changes in abiotic conditions and various model constants.<new para>ADDITIONAL ABSTRACT:<new para>The dry matter production of swards of blue grama (Bouteloua gracilis) was modelled using measured effects 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 sensitivity analysis of the model demonstrated that predicted primary productivity varied considerably with changes in abiotic conditions and various model constants.