Abstract
A canopy transpiration mode, RM-CWU, was used to estimate transpiration of subalpine forest trees. Calculations indicate a threefold difference in annual transpiration among species in the central Rocky Mountains. Ratios of annual transpiration for stands of equal basal area are 3.2:2.1:1.8:1 for Engelmann spruce, subalpine fir, lodgepole pine, and aspen, respectively. Species differences may be attributed to differences in leaf conductance, leaf-air temperature difference, leaf area index, and length of the transpiration season. The large range of annual transpiration suggests that manipulation of stand composition and density is a viable approach to influence water yield from subalpine watersheds.
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