Relationship between gully erosion, land use, soils and parent materials in the Lavras Region, Minas Gerais State, Brazil

Silva, A.C.; Lima, J.M. de; Curi, N.

Revista Brasileira de Ciencia do Solo 17(3): 459-464

1993


ISSN/ISBN: 0100-0683
Accession: 002477819

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Abstract
Relationships between gully erosion and land use and soils of the Lavras region, State of Minas Gerais, Brazil, were established. Photointerpretation was performed to identify gully erosion. Thirty-six soil profiles were collected out of 162 described in gully walls. The average solum thickness was measured as well as gully depth and the watershed area of each gully. Differences between top and bottom were also measured as well as the probable origin, natural vegetation and stabilization level. Gullies occupied an area of about 377 ha, which represents 0.6% of the total area studied (618 kmsuperscript 2). Incorrect land use, during the various cycles of human colonization, has exposed the soil to the erosive action of water, contributing to the initiation of this erosion form. The Cambisols are the soils with the greatest gully erosion/kmsuperscript 2 ratio, while the podzolic soils have the smallest. Under similar conditions, the soils derived from alteration products of mica schists and quartzites are more susceptible to gully erosion than those from alteration products of granitic gneiss.