VARIABILIDADE TEMPORAL E ESPACIAL DA EROSIVIDADE DAS CHUVAS NO ESTADO DE GOIÁS SEGUNDO TRÊS MODELOS

Abstract

Currently, Universal Soil Loss Equation (USLE) developed by Wischmeier e Smith (1978) is considered an efficient and relatively low cost method to predict the losses that a soil will suffer due to different management, conservationist practices, and under different edaphoclimatic conditions, being a direct indication of the sustainability of a productive system. The erosivity factor (R) is one of the variables that make up the USLE model and expresses the capacity or erosive potential of a rain, and its value is defined by the EI30 index. The main objective of this study was to test and evaluate, for the state of Goiás, three different methods of estimating the EI30 proposed by Morais et al. (1991), Lombardi Neto e Moldenhauer (1992) and Silva et al. (1997), and check if there were significant changes in the value of rain erosivity between 1985 and 2017. So, it was observed that both the precipitation and erosivity values varied over the age of 33 years in 9.3%, a value considered “low” according to the classification of Pimentel-Gomes (1985).