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Résumé :
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An experimental design which includes three lysimeters and one weather station was installed at the Fort Drum Marsh in the upper St. John's River Basin, Florida, to estimate evapotranspiration (ET) for wetland vegetation such as cattail (Typha domingensis) and sawgrass (Cladium jamaicense). Vegetative parameters as related to ET estimation were measured, including stomatal resistance, leaf area index, canopy height, plant density, fresh plant biomass, dry plant biomass, canopy temperature, air temperature, and plant spectral reflectance. After installation, the data from four field trips showed that the lysimeter system performed well. In particular, the normalized difference vegetation index (NDVI) derived from spectral reflectance measurements provided a useful parameter for identifying cattail and sawgrass that could be used to estimate regional wetland ET in the future, using satellite imagery.
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