Abstract
The effect of foliage orientation on light interception and photosynthesis within two tussock grasses, Agropyron desertorum and Pseudoroegneria spicata, was assessed with a new three-dimensional simulation model. The model can account for spatial differences in foliage distribution within the tussock as well as differences in physiological properties of the foliage elements. Light interception and net photosynthesis are calculated for sunlit and shaded foliage. Model predictions of whole-plant net photosynthesis (A tuss ), transpiration (E tuss ), water-use efficiency, expressed as the ratio A tuss to E tuss , and average intercellular CO 2 compared very well with measurements in the field taken with a whole-plant gas-exchange system (...)
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