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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos; Embrapa Milho e Sorgo. |
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Data corrente: |
17/11/2011 |
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Data da última atualização: |
05/09/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SILVA, G. L.; LIMA, H. V.; CAMPANHA, M. M.; GILKES, R. J.; OLIVEIRA, T. S. |
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Afiliação: |
Universidade Federal do Ceará (UFC) - Fortaleza, CE.; Universidade Federal Rural do Amazonas, Belém, PA.; MONICA MATOSO CAMPANHA, CNPMS; School of Earth and Environment, The University of Western Australia, Australia; UFC, Fortaleza, CE. |
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Título: |
Soil physical quality of Luvisols under agroforestry, natural vegetation and conventional crop management systems in the Brazilian semi-arid region. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 167/168, p. 61-70, Nov. 2011. |
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DOI: |
10.1016/j.geoderma.2011.09.009 |
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Idioma: |
Inglês |
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Conteúdo: |
The imposition of agricultural systems changes the natural equilibrium of the soil to an extent that it becomes dependant on management practices and soil resilience. Agroforestry systems (AFs) mimic characteristics of natural ecosystems such as multistrata canopy and deep rooting and may minimize the consequences of these changes by providing soil protection and maintenance of conditions similar to those under natural vegetation. This study evaluates the physical properties of a Luvisol at a site where since 1997 alternative agroforestry systems (AFs) (agrosilvipasture?AGP and silvipasture?SILV), conventional crop management (CCM) and natural vegetation (NV) have been maintained. Undisturbed soil cores were collected in 2005 and submitted to a range of matric suction for which soil bulk density (BD), soil penetration resistance (Q) and soil water content (?) were determined. Water retention and penetration resistance were used to determine the least limiting water range (LLWR) and the slope of the soil water retention curve at its inflection point (S-value). Particle size, total organic carbon (TOC) and particle density were determined using the disturbed soil samples. Water retention and porosity followed the sequence NVNSILVNCCMNAGP. The AFs studied (AGP and SILV) improved or maintained soil physical quality when compared to NV with no significant differences between the S-values of 0.044, 0.042 and 0.050, respectively. However, the S-value of 0.035 for CCM indicates that this management was unable to maintain soil physical quality on the same levels as AFs and NV. The decrease of LLWR with BD occurred for all treatments, and the BD at a maximum effect (LLWR=0) which is called the critical BD (BDc), was, respectively, 1.69, 1.62, 1.56 and 1.56 Mg m?3 for AGP, SILV, NV and CCM. The larger values of LLWR for AFs (AGP and SILV) are similar to the value for NV, with associated superior aeration, matric suction and reduced resistance to penetration by roots. Indices such as LLWR and S-value were suitably sensitive and could be used in future research, but it is important to identify other potential indices for these situations that can show how quickly changes in soil quality may occur. MenosThe imposition of agricultural systems changes the natural equilibrium of the soil to an extent that it becomes dependant on management practices and soil resilience. Agroforestry systems (AFs) mimic characteristics of natural ecosystems such as multistrata canopy and deep rooting and may minimize the consequences of these changes by providing soil protection and maintenance of conditions similar to those under natural vegetation. This study evaluates the physical properties of a Luvisol at a site where since 1997 alternative agroforestry systems (AFs) (agrosilvipasture?AGP and silvipasture?SILV), conventional crop management (CCM) and natural vegetation (NV) have been maintained. Undisturbed soil cores were collected in 2005 and submitted to a range of matric suction for which soil bulk density (BD), soil penetration resistance (Q) and soil water content (?) were determined. Water retention and penetration resistance were used to determine the least limiting water range (LLWR) and the slope of the soil water retention curve at its inflection point (S-value). Particle size, total organic carbon (TOC) and particle density were determined using the disturbed soil samples. Water retention and porosity followed the sequence NVNSILVNCCMNAGP. The AFs studied (AGP and SILV) improved or maintained soil physical quality when compared to NV with no significant differences between the S-values of 0.044, 0.042 and 0.050, respectively. However, the S-value of 0.035 for CCM indicates that... Mostrar Tudo |
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Palavras-Chave: |
Agroecologia; Agrofloresta; Agroforestry systems; Código florestal; Higroscopicidade; Least limiting water range; Resistência à penetração; S-value; Sistemas agroflorestais. |
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Thesagro: |
Caatinga; Estrutura do solo; Manejo do solo; Retenção de água no solo; Solo. |
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Thesaurus Nal: |
Agroecology; Brazil; Hygroscopicity; Semiarid soils; Soil management; Soil penetration resistance; Soil structure. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03533naa a2200433 a 4500
001 1906840
005 2018-09-05
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1016/j.geoderma.2011.09.009$2DOI
100 1 $aSILVA, G. L.
245 $aSoil physical quality of Luvisols under agroforestry, natural vegetation and conventional crop management systems in the Brazilian semi-arid region.$h[electronic resource]
260 $c2011
520 $aThe imposition of agricultural systems changes the natural equilibrium of the soil to an extent that it becomes dependant on management practices and soil resilience. Agroforestry systems (AFs) mimic characteristics of natural ecosystems such as multistrata canopy and deep rooting and may minimize the consequences of these changes by providing soil protection and maintenance of conditions similar to those under natural vegetation. This study evaluates the physical properties of a Luvisol at a site where since 1997 alternative agroforestry systems (AFs) (agrosilvipasture?AGP and silvipasture?SILV), conventional crop management (CCM) and natural vegetation (NV) have been maintained. Undisturbed soil cores were collected in 2005 and submitted to a range of matric suction for which soil bulk density (BD), soil penetration resistance (Q) and soil water content (?) were determined. Water retention and penetration resistance were used to determine the least limiting water range (LLWR) and the slope of the soil water retention curve at its inflection point (S-value). Particle size, total organic carbon (TOC) and particle density were determined using the disturbed soil samples. Water retention and porosity followed the sequence NVNSILVNCCMNAGP. The AFs studied (AGP and SILV) improved or maintained soil physical quality when compared to NV with no significant differences between the S-values of 0.044, 0.042 and 0.050, respectively. However, the S-value of 0.035 for CCM indicates that this management was unable to maintain soil physical quality on the same levels as AFs and NV. The decrease of LLWR with BD occurred for all treatments, and the BD at a maximum effect (LLWR=0) which is called the critical BD (BDc), was, respectively, 1.69, 1.62, 1.56 and 1.56 Mg m?3 for AGP, SILV, NV and CCM. The larger values of LLWR for AFs (AGP and SILV) are similar to the value for NV, with associated superior aeration, matric suction and reduced resistance to penetration by roots. Indices such as LLWR and S-value were suitably sensitive and could be used in future research, but it is important to identify other potential indices for these situations that can show how quickly changes in soil quality may occur.
650 $aAgroecology
650 $aBrazil
650 $aHygroscopicity
650 $aSemiarid soils
650 $aSoil management
650 $aSoil penetration resistance
650 $aSoil structure
650 $aCaatinga
650 $aEstrutura do solo
650 $aManejo do solo
650 $aRetenção de água no solo
650 $aSolo
653 $aAgroecologia
653 $aAgrofloresta
653 $aAgroforestry systems
653 $aCódigo florestal
653 $aHigroscopicidade
653 $aLeast limiting water range
653 $aResistência à penetração
653 $aS-value
653 $aSistemas agroflorestais
700 1 $aLIMA, H. V.
700 1 $aCAMPANHA, M. M.
700 1 $aGILKES, R. J.
700 1 $aOLIVEIRA, T. S.
773 $tGeoderma, Amsterdam$gv. 167/168, p. 61-70, Nov. 2011.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Territorial. Para informações adicionais entre em contato com cnpm.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
30/09/2011 |
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Data da última atualização: |
03/05/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
LEIVAS, J. F.; RIBEIRO, G. G.; SARAIVA, I.; SANTO, J. S. do E.; SOUZA, M. B. de; ROCHA FILHO, J. |
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Afiliação: |
JANICE FREITAS LEIVAS, CNPM; GUSTAVO GUTERRES RIBEIRO, SIPAM; IVAN SARAIVA, SIPAM; JULIO SILVA DO ESPIRITO SANTO, SIPAM; MONIQUE BRASIL DE SOUZA, SIPAM; JOÃO ROCHA FILHO, SIPAM. |
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Título: |
Avaliação dos prognósticos de precipitação simulada pelo modelo BRAMS na Amazônia Ocidental na estação chuvosa. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Acta Amazonica, v. 41, n. 3, p. 347-354, 2011. |
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Idioma: |
Português |
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Conteúdo: |
O objetivo deste estudo é avaliar o modelo de previsão numérica do tempo BRAMS (Brazilian Regional Atmospheric Modelling System), a partir da comparação entre os valores preditos e os observados (dados do NCEP/NOAA (National Centers of Environmental Predictions/ National Oceanic and Atmospheric Administration) e do satélite TRMM (Tropical Rainfall Measuring Mission)). O modelo foi assimilado com dados do modelo global do NCEP/NOAA e do CPTEC/INPE. Foram realizadas comparações entre os valores preditos e os observados através da raiz do erro quadrático médio (RMSE) e do erro médio (ME) para os prognósticos de precipitação para os horizontes de 24, 48, 72 e 96 horas, do período de novembro de 2008 a março de 2009. Os resultados mostraram que o modelo BRAMS teve uma performance melhor quando assimilado com dados do modelo global do NCEP/NOAA comparado com as saídas a partir das assimilações do modelo global do CPTEC/INPE. |
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Palavras-Chave: |
Modelagem numérica; Precipitação. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01591naa a2200217 a 4500
001 1901868
005 2019-05-03
008 2011 bl uuuu u00u1 u #d
100 1 $aLEIVAS, J. F.
245 $aAvaliação dos prognósticos de precipitação simulada pelo modelo BRAMS na Amazônia Ocidental na estação chuvosa.
260 $c2011
520 $aO objetivo deste estudo é avaliar o modelo de previsão numérica do tempo BRAMS (Brazilian Regional Atmospheric Modelling System), a partir da comparação entre os valores preditos e os observados (dados do NCEP/NOAA (National Centers of Environmental Predictions/ National Oceanic and Atmospheric Administration) e do satélite TRMM (Tropical Rainfall Measuring Mission)). O modelo foi assimilado com dados do modelo global do NCEP/NOAA e do CPTEC/INPE. Foram realizadas comparações entre os valores preditos e os observados através da raiz do erro quadrático médio (RMSE) e do erro médio (ME) para os prognósticos de precipitação para os horizontes de 24, 48, 72 e 96 horas, do período de novembro de 2008 a março de 2009. Os resultados mostraram que o modelo BRAMS teve uma performance melhor quando assimilado com dados do modelo global do NCEP/NOAA comparado com as saídas a partir das assimilações do modelo global do CPTEC/INPE.
650 $aAmazonia
653 $aModelagem numérica
653 $aPrecipitação
700 1 $aRIBEIRO, G. G.
700 1 $aSARAIVA, I.
700 1 $aSANTO, J. S. do E.
700 1 $aSOUZA, M. B. de
700 1 $aROCHA FILHO, J.
773 $tActa Amazonica$gv. 41, n. 3, p. 347-354, 2011.
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