Abstract
Leaf angle and leaf absorptance are two leaf parameters that link a leaf and its physical environment. These characters affect both the amount of solar radiation incident on a leaf and the fraction of that incident light which is actually absorbed. Differences in both leaf angle and leaf spectral characteristics have been known for some time for plants of divergent habitats, and it has been inferred that they confer some adaptive advantage to plants from arid habitats (Haberlandt 1884; Schimper 1903; Warming 1909). However, it is only relatively recently that the significance of these features to leaf temperature and water loss have been quantitatively evaluated (Raschke 1960; Gates 1963, 1980). Evaluating the interactions between energy balance, leaf temperature, transpiration and photosynthesis at the leaf level have provided a means for evaluating the significance of changes in leaf angle and/or absorptance to plant performance under different environmental conditions (Mooney 1972; Parkhurst and Loucks 1972; Cowan and Farquhar 1977; Ehleringer and Mooney 1978; Mooney and Gulmon 1979).
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