https://dx.doi.org/10.1672/0277-5212(2002)022[0374:EFAWPW]2.0.CO;2">
 

Title

Evapotranspiration from a wet prairie wetland under drought conditions: Paynes prairie preserve, Florida, USA

Abstract

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.

Department

Earth Systems Research Center

Publication Date

6-1-2002

Journal Title

Wetlands

Publisher

Springer

Document Type

Article

Rights

© Society of Wetland Scientists 2002

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