Evapotranspiration from a wet prairie wetland under drought conditions: Paynes prairie preserve, Florida, USA
Evapotranspiration and other surface-energy balance components of a wet prairie community dominated by Panicum hemitomon (maiden cane), Ptilimnium capillaceum (mock bishop’s weed), and Eupatorium capillifolium (dog fennel) in Central Florida, USA were investigated. Drought conditions resulted in water-table levels from 0.58 to 1.20 m below ground level and variable soil wetness conditions during the observation period. Energy-balance measurements were made using the eddy correlation approach. The overall evapotranspiration rate was 4.16 mm d−1, and the average Bowen ratio was 0.42. Energy partitioning had an enhanced sensible heat-flux component and a dampened latent heat-flux component when the volumetric soil water content was less than or equal to 0.09 for the sandy soil. Evapotranspiration was classified into a two stages, first stage (wet) and second stage (dry) based on the soil water availability. The Penman-Monteith model gave good results for the first stage evapotranspiration. The Priestly-Taylor and the Penman models overstimated first stage evapotranspiration. A simple second stage evapotranspiration model, developed by applying a reduction factor based on soil moisture to the Penman-Monteith model, provided improved estimates of evapotranspiration for second stage observations.
Earth Systems Research Center
Digital Object Identifier (DOI)
Jacobs, J.M., S.L. Mergelsberg, A. Lopera, and D.A. Myers. 2002. Evapotranspiration from a wet prairie wetland under drought conditions: Paynes Prairie Preserve, Florida, USA, Wetlands. 22(2), 374-385.
© Society of Wetland Scientists 2002