Abstract
Sedges (Carex spp.) often dominate the vegetation of wetlands. Therefore knowledge of their gas exchange is needed for an accurate calculation of the canopy transpiration in such wetlands. Within the frame of an extended comparative ecological study of Carex species the leaf gas exchange was investigated porometrically in Carex riparia, C acutiformis and C. hirta. Models to calculate leaf conductance (g1) for the different sedge species are used together with microclimatic and biomass data from a large sedge stand for upscaling of transpiration rates to canopy level. The species specific differences in stomatal conductance and transpiration are clearly identifiable at canopy level. Depending on species, canopy transpiration is up to 25% higher or lower. This makes it necessary to take species specific differences into account in wetland hydrology.
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