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Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
26/08/2021 |
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Data da última atualização: |
26/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
FERREIRA, Q. de C. G.; BACELLAR, L. de A. P.; VIANA, J. H. M. |
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Afiliação: |
QUENIA DE CASSIA GOULART FERREIRA, Universidade Federal de Ouro Preto; LUIS DE ALMEIDA PRADO BACELLAR, Universidade Federal de Ouro Preto; JOAO HERBERT MOREIRA VIANA, CNPMS. |
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Título: |
Evaluation of soil moisture by electrical resistivity in Oxisols of the central Brazilian savanna. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Geoderma Regional, v. 26, e00408, 2021. |
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DOI: |
https://doi.org/10.1016/j.geodrs.2021.e00408 |
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Idioma: |
Inglês |
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Conteúdo: |
The determination of the spatial distribution of soil moisture in the field is relevant for many purposes in agriculture and engineering, but it is still a challenge, since standard determination methods have limitations and problems of representativeness. Electrical resistivity may be used with this finality, but this method is still poorly studied for highly weathered tropical soils, which present structural and textural peculiarities. This work aims to present the calibration of the moisture/electrical resistivity relationships for a typical tropical soil, and to evaluate its robustness as a soil moisture prediction method. A highly weathered clay soil (Oxisol), representative of the Brazilian savanna (?Cerrado?), was sampled and the resistivity tests of the A, Bw and C horizons were conducted in a four-electrode cell array. The A and Bw horizons of clay Oxisols usually present resistivity values greater than temperate soils counterparts, which can be attributed to the lower content of highly active clays and higher macroporosity. The soil electrical resistivity/volumetric moisture relationship present a nonlinear and inverse trend and the generalized form of Archie?s law has the potential to be applied to determine the water content of these soils. The electrical resistivity/volumetric soil moisture semi-log plot showed a two-step pattern, with a remarkable change in the behavior around the moisture associated to the wilting point. The field validation shows that the use of the electrical resistivity is possible for the measurement of soil moisture and for the subsurface mapping of its horizons. MenosThe determination of the spatial distribution of soil moisture in the field is relevant for many purposes in agriculture and engineering, but it is still a challenge, since standard determination methods have limitations and problems of representativeness. Electrical resistivity may be used with this finality, but this method is still poorly studied for highly weathered tropical soils, which present structural and textural peculiarities. This work aims to present the calibration of the moisture/electrical resistivity relationships for a typical tropical soil, and to evaluate its robustness as a soil moisture prediction method. A highly weathered clay soil (Oxisol), representative of the Brazilian savanna (?Cerrado?), was sampled and the resistivity tests of the A, Bw and C horizons were conducted in a four-electrode cell array. The A and Bw horizons of clay Oxisols usually present resistivity values greater than temperate soils counterparts, which can be attributed to the lower content of highly active clays and higher macroporosity. The soil electrical resistivity/volumetric moisture relationship present a nonlinear and inverse trend and the generalized form of Archie?s law has the potential to be applied to determine the water content of these soils. The electrical resistivity/volumetric soil moisture semi-log plot showed a two-step pattern, with a remarkable change in the behavior around the moisture associated to the wilting point. The field validation shows that the use... Mostrar Tudo |
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Palavras-Chave: |
Electrical resistivity; Resistividade elétrica; Soil moisture. |
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Thesagro: |
Latossolo; Umidade do Solo. |
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Thesaurus NAL: |
Oxisols; Savannas. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02370naa a2200241 a 4500
001 2133865
005 2021-08-26
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.geodrs.2021.e00408$2DOI
100 1 $aFERREIRA, Q. de C. G.
245 $aEvaluation of soil moisture by electrical resistivity in Oxisols of the central Brazilian savanna.$h[electronic resource]
260 $c2021
520 $aThe determination of the spatial distribution of soil moisture in the field is relevant for many purposes in agriculture and engineering, but it is still a challenge, since standard determination methods have limitations and problems of representativeness. Electrical resistivity may be used with this finality, but this method is still poorly studied for highly weathered tropical soils, which present structural and textural peculiarities. This work aims to present the calibration of the moisture/electrical resistivity relationships for a typical tropical soil, and to evaluate its robustness as a soil moisture prediction method. A highly weathered clay soil (Oxisol), representative of the Brazilian savanna (?Cerrado?), was sampled and the resistivity tests of the A, Bw and C horizons were conducted in a four-electrode cell array. The A and Bw horizons of clay Oxisols usually present resistivity values greater than temperate soils counterparts, which can be attributed to the lower content of highly active clays and higher macroporosity. The soil electrical resistivity/volumetric moisture relationship present a nonlinear and inverse trend and the generalized form of Archie?s law has the potential to be applied to determine the water content of these soils. The electrical resistivity/volumetric soil moisture semi-log plot showed a two-step pattern, with a remarkable change in the behavior around the moisture associated to the wilting point. The field validation shows that the use of the electrical resistivity is possible for the measurement of soil moisture and for the subsurface mapping of its horizons.
650 $aOxisols
650 $aSavannas
650 $aLatossolo
650 $aUmidade do Solo
653 $aElectrical resistivity
653 $aResistividade elétrica
653 $aSoil moisture
700 1 $aBACELLAR, L. de A. P.
700 1 $aVIANA, J. H. M.
773 $tGeoderma Regional$gv. 26, e00408, 2021.
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