Avaliação da suscetibilidade natural e do potencial à erosão laminar na Bacia Hidrográfica do Ribeirão do Boqueirão, município de Davinópolis (GO)
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Data
2016-05-04
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Universidade Federal de Goiás
Resumo
Over time, the human societies have developed and increased their capacity of spatially
reorganize the elements of the environment that surrounds them. Thus, the human
intervention has become one of the engaging agents of the landscape, along with the
physical and biological processes. This means that human activities influence and
accelerate the erosion processes. Specifically, laminar erosion is a form of manifestation
of the hydric erosion that occurs silently, depleting the soil fertility, gradually, over time.
For this reason, Bertoni and Lombardi Neto (2014) emphasize that this type of erosion is
one of the most dangerous, especially in countries with tropical climates. From this, we
aim to do a diagnosis of natural susceptibility and of laminar erosion potential in the basin
of the Ribeirão of Boqueirão, in the municipality of Davinópolis (GO), in order to
investigate how the current land use/ vegetal cover influence to increase, mitigate or
neutralize the natural susceptibility to laminar erosion in this basin. The methodology was
based predominantly on adapting of the proposal of Salomão (1999), which determined a
correlation matrix between the slopes declivity and the soil erodibility, for generating
cartographic document indicating the natural susceptibility to laminar erosion. When it
was overlaid on the map of land use / vegetal cover, resulted in the current potential map
to laminar erosion. In the basin of Ribeirão of Boqueirão, which in general has dissected
topography, we observed a high percentage of areas with high natural susceptibility to
laminar erosion, which imposes restrictions for agricultural activities. The areas with
lower natural susceptibility to laminar erosion are near to the main watercourse, in the
central part of this basin. With respect to land use / vegetal cover, overall, it was not
verified adoption of conservation measures and/ or harmonization of human activities to
natural limitations to laminar erosion. Thus, the class I, with high laminar erosion
potential, was mapped in 37.72% of the watershed area and, in general, points to areas
where the land use is incompatible with natural limitations. In the meantime, the class II
(medium potential) appeared in 45.33% of the watershed area, in which case there is
incompatibility between the land use and natural susceptibility, which can be solved with
the use of conservation practices. In the rest of the watershed, 16.95%, there is class III
(low potential). The data presented show the need for planning that seeks to conserve
the soil of this watershed, which also is one of the largest basins, fully located in the
municipality of Davinópolis (GO). One should highlight that the families of farmers, when
exploring the lands of this watershed, ensure their socio-economic reproduction and
contribute to the economic dynamics of the municipality of Davinópolis, which has the
agricultural production as an important pillar.
Descrição
Palavras-chave
Declividade das encostas, Erodibilidade dos solos, Uso da Terra/cobertura vegetal, Erosão laminar, Slopes declivity, Soil erodibility, Land use/ vegetal cover, Laminar erosion
Citação
RODRIGUES, D. E. Avaliação da suscetibilidade natural e do potencial à erosão laminar na Bacia Hidrográfica do Ribeirão do Boqueirão, município de Davinópolis (GO). 2016. 110 f. Dissertação ( Mestrado em Geografia) - Universidade Federal de Goiás, Catalão, 2016.