Estimativa da Evapotranspiração numa Pastagem Mista, em Condições de Cerrado, pelos Métodos de Razão de Bowen e Penman-Monteith

Marcelo Sacardi Biudes, Carla Maria Abido Valentini, José Holanda Campelo Júnior, José de Souza Nogueira

Abstract


The objective of this work was to determine the energy balanceand the evapotranspiration by the Bowen ratio method and to comparewith the reference evapotranspiration obtained with the Penman-MonteithsModel of a mixed pasture composed of three types of species: Panicummaximum, Elyonurus muticus and Brachiaria humidícola in cerradoconditions, of september to december of 2006. The experiment wasconducted in the Experimental Farm of the Universidade Federal de MatoGrosso, in Santo Antônio do Leveger - MT, where the AgrocilmatologicalStation Ricardo Remetter is located to 50 m of the study location. Thetemperature and vapor pressure values were measured in the heights 0,55,1,00 and 1,55 m (levels 1, 2 and 3). The energy balance estimate wassatisfactory when it used the levels gradients 1-2 and 1-3, with reliable index(c) of 0,87. However, the energy balance estimated in the levels 2-3 hadvalues of the Bowen ratio outside the reliable limit (-0,5 and 0,5) and reliableindex (c) of 0,73, being smaller than the levels 1-2 and 1-3. The radiationbalance was used mainly as latent heat, being affected by the meteorologicalvariable and by water availability in the soil.



DOI: https://doi.org/10.5902/2179460X9757

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