Abstract

LUNA TOLEDO, E.S; FIGUEROLA, P.I; ABRIL, E.G  and  RAVELO, A.C. La fracción evaporativa en diferentes regiones agrícolas y naturales del centro-noroeste de la Argentina. Agriscientia [online]. 2013, vol.30, n.1, pp.13-24. ISSN 1668-298X.

The evaporative fraction (FE) allows quantifying the portion of the available energy used in the process of evapotranspiration. The spatial distribution of the FE is obtained for five types of land covers: Trees, crops, grassland, shrubs and bare soil in fve eco-regions of Central-North Western Argentina using MODIS sensor products. FE was calculated using a triangle method for the relation between the fraction of the soil cover (Fr) and the surface temperature (Ts). Both variables were correlated for each type of land cover and eco-region. Fr and Ts are inversely associated and soil cover and different eco-regions showed changes in the line trend between Fr and T due to changes in the percentage and type of coverage, the rainfall gradients and vegetation structure. The mean values of Fr and FE for cover type and eco-regions, were processed using the analysis of variance and the multiple comparison test of Fisher. Statistically significant differences were found in Fr and FE according to type of land cover and eco-region and there is a nonlinear relationship between Fr and FE. Finally, a map was generated showing the spatial distribution of FE.

Keywords : Evaporative fraction; Eco-regions; MODIS; Heterogeneity.

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