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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Abstract

SILVA, Antonio Marcos da et al. Rainfall erosivity and erodibility of Cambisol (Inceptisol) and Latosol (Oxisol) in the region of Lavras, Southern Minas Gerais State, Brazil. Rev. Bras. Ciênc. Solo [online]. 2009, vol.33, n.6, pp.1811-1820. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832009000600029.

Relatively few studies in Brazil have investigated soil erodibility, mainly for Cambisols (Inceptisols), due to the tediousness of data collection in natural rainfall experiments. Knowledge about erodibility and erosivity is important for conservation planning, which contributes to soil sustainability. This study aimed at evaluating the rainfall erosivity and erodibility of a typic dystrophic Tb Haplic Cambisol (Inceptisol) and a typic dystroferric Red Latosol (Oxisol) under natural rainfall, in Lavras, state of Minas Gerais, Brazil, between 1998 and 2002. Pluvial precipitation data were obtained from the main weather station of Lavras, of the Universidade Federal de Lavras, close to the soil loss experimental plots. Erosivity (EI30) was calculated as the product of the rain kinetic energy by the maximum intensity in 30 min. Based on these data, correlated with the soil losses, the soil erodibility could be computed. The mean annual total precipitation was 1,287 mm and the mean calculated erosivity 4,865 MJ mm ha-1 h-1 year-1. The erodibility of the Cambisol was 0.026 Mg h MJ-1 mm -1 and of the Latosol 0.004 Mg h MJ-1 mm -1, in agreement with their differential mineralogical, chemical, physical and morphological properties.

Keywords : water erosion; K factor; kinetic energy; Inceptisol; Oxisol.

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