Análise da dinâmica da evapotranspiração, precipitação e NDVI no Cerrado brasileiro entre 2001 e 2013 utilizando dados MODIS e TRMM
The Brazilian Cerrado focuses the world attention, both for its great biological diversity and for the agricultural expansion, which has led to changes in land use and land cover. These changes have potential to affect ecosystems and economic sectors, as well as affect water and energy balance, directly impacting on the evapotranspiration (ET). This work aims to evaluate the spatial and temporal behavior of ET in different land covers of the Brazilian Cerrado, as well as its correlation with precipitation and NDVI, using TRMM and MODIS data. ET presents higher values is land covers with higher amount of biomass on the surface, such as forests, which present higher ET loss considering the entire ET time series, while the agricultural areas, which does not present green cover during most of the year, showed lower ET rates. According to the t student test there is a linear correlation between ET and precipitation and between ET and NDVI for all the land cover classes. ET was directly related to NDVI, especially for agriculture classes (R² = 0.86) and agriculture / vegetation mosaic (R² = 0.83). The relationship between ET and precipitation was more consistent for the mosaic classes of agriculture / vegetation (R² = 0.65) and woody savanna (R² = 0.63), while the other land cover classes presented similar results.