Relações entre qualidade da água e uso do solo em Goiás: uma análise à escala da bacia hidrográfica
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2008
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Resumo
The main goal of this paper was to investigate possible relations between water quality and
land use in public water-supplying watersheds in the state of Goias. Thus, data from 174 catchments, operated
by Saneamento de Goias were compiled, corresponding to January/2002 - December/2004. Annual, drought
and flood season means for turbidity, apparent color, pH, chloride and total and fecal coliform indices (ICT
and ICF) were reported and summarized by principal component analysis, into a water quality index (IQA),
Based on the land cover map for Goias, at the 1:250,000 scale, and on a SRTM (Shuttle Radar Topography
Mission) mosaic, 89 water-supplying watersheds were delimited, for which a normalized remaining vegetation
index was calculated. Apparent color, turbidity, pH, ICT and ICF did not achieve the required legal standards
in up to 62.43% of the catchment data analyzed, particularly in the flood season, when the worst IQA values
are observed. Our results demonstrate that the IQA utilized is responsible for both the seasonal variations
and apportion of sediments and organic matter, via superficial run-off. Likewise, this index is also slightly
related to the regional NRVI variations. In order to better determine these relations, further studies are needed,
taking into account other water quality parameters (e.g. nitrogen and phosphorous) and different landscape
scales (e.g. riparian zone).
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Palavras-chave
Land use, Uso do solo, Water quality and IQA, Qualidade da água e IQA
Citação
BONNET, Barbara Rocha Pinto; FERREIRA, Laerte Guimarães; LOBO, Fabio Carneiro . Relações entre qualidade da água e uso do solo em Goiás: uma análise à escala da bacia hidrográfica. Revista Árvore, Viçosa, v. 32, n. 2, p. 311-322, 2008.