Efeitos do relevo na estimativa da transpiração real do eucalipto

Abstract

The aim of this study was to evaluate the influence of the relief in the estimation of transpiration real of eucalyptus plantation. Specifically, we intend to verify the effect in estimated transpiration by real spatial method with estimatida method punctual. Water balance components were monitored in a micro watershed located in the Eastern region of the state of Minas Gerais, Brazil. The Transpiration was estimated real timely and spatially and in time scale for the useful layer of soil and validated with data measured in the field. When comparing the averages of the spatial variation of transpiration real spatial method with that obtained by the method punctual, it was observed that in the two years analyzed, the months in which there was availability or soil water storage for eucalyptus, transpiration by the spatial method was on average 25% higher than the punctual. Already in the months that the availability of soil water was lower, perspiration space was on average 14% less than punctual. The method of estimating of transpiration real considering the effects of topography, proved more than adequate without considering it. If there is water availability in the soil for plant, features of relief can considerably influence the transpiration rates. Eucalyptus forests proved a good regulator of the flow of water in watersheds.Pages: 2740-274