Perdas de solo e água em uma sub-bacia hidrográfica da região Alto Rio Grande.

Abstract

Soil water erosion is one of the most important types of soil degradation, bringing serious problems to environment. Important mathematical inferences about soil water erosion behavior at long of year are done with evaluation data come from directly of small watershed. This work goals to quantify the soil water erosion of soils belong to Ribeirão Marcela watershed, its erodibility and water losses under natural rainfall during hydrological year of 2004-2005. Five plots for soil and water losses monitoring were installed according to soil classification and its nowadays use predominant. Two plots are in Dystrophic Red Oxissol, being one with grass and another in soil bare; other two plots in Yellow Red Oxissol, being one in grass and another with Eucalyptus and one plot in Cambissol with grass. Cambissol was the soil that has presented the greatest soil and water losses and the greatest erodibility, followed by Yellow Red Oxissol and Dystrophic Red Oxissol. Nowadays soil use and slope of plots were the most important parameters for explanation of soil and water losses inside of the same soil class.