Estimativa da evapotranspiração em sistemas integrados no cerrado, utilizando o algoritmo SAFER

Abstract

Cerrado is often degraded, with silted water courses, absence of riparian forests and unprotected springs, leading to the inability to generate and store water to meet current demand. Therefore, it is important to assess the water flows above ground in the new integrated systems installed in the region, with the combined use of Sentinel-2 satellite images in the period 2017-2019 and information from weather stations. Therefore, the SAFER model was used to estimate the current evapotranspiration, resulting in an average of 1.15 mm day-1, with a maximum and minimum value of 3.69 and 0.00 mm day-1, respectively. In the livestock-forest integration treatment, the highest mean ETa was observed (1.33 mm day-1) and, in the degraded pasture treatment, the lowest mean ETa (0.96 mm day-1) was observed. However, the degraded pasture treatment had the lowest variability (0.96 ± 0.78 mm day-1) and the crop-livestock-forest integration treatment for silage showed the highest variability (1.26 ± 1.40 mm day-1). The integrated systems were adapted to the region's seasonality, suffering water stress in the dry season and with space-time heterogeneity in the wet season.