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Registro Completo |
Biblioteca(s): |
Embrapa Semiárido. |
Data corrente: |
24/11/1997 |
Data da última atualização: |
16/01/2023 |
Autoria: |
NOBRE, C. A.; MASSAMBANI, O.; LIU, W. T. H. |
Título: |
Climatic variability in the semi-arid regiao of Brazil and drought monitoring form satellite. |
Ano de publicação: |
1993 |
Fonte/Imprenta: |
CONFERENCIA INTERNACIONAL SOBRE IMPACTOS DE VARIACOES CLIMATICAS E DESENVOLVIMENTO SUSTENTAVEL EM REGIOES SEMI-ARIDAS-ICID, 1992. Fortaleza, CE. Anais... Fortaleza: Governo do Estado do Ceara/Fundacao Esquel/FIEC/CNI/BNB, 1993. v.2, p.447-480. |
Idioma: |
Português |
Conteúdo: |
Apresenta a dinamica em larga escala de anomalias de chuva no Nordeste do Brasil com monitoramento de seca por satelite. Aborda o aquecimento global e a mudanca de clima do Nordeste do Brasil. |
Palavras-Chave: |
Aquecimento global; Monitoramento; Recursos naturais; Semi-arido; Variabilidade. |
Thesagro: |
Clima; Satélite; Seca; Sensoriamento Remoto. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01075naa a2200253 a 4500 001 1127741 005 2023-01-16 008 1993 bl uuuu u00u1 u #d 100 1 $aNOBRE, C. A. 245 $aClimatic variability in the semi-arid regiao of Brazil and drought monitoring form satellite. 260 $c1993 520 $aApresenta a dinamica em larga escala de anomalias de chuva no Nordeste do Brasil com monitoramento de seca por satelite. Aborda o aquecimento global e a mudanca de clima do Nordeste do Brasil. 650 $aClima 650 $aSatélite 650 $aSeca 650 $aSensoriamento Remoto 653 $aAquecimento global 653 $aMonitoramento 653 $aRecursos naturais 653 $aSemi-arido 653 $aVariabilidade 700 1 $aMASSAMBANI, O. 700 1 $aLIU, W. T. H. 773 $tCONFERENCIA INTERNACIONAL SOBRE IMPACTOS DE VARIACOES CLIMATICAS E DESENVOLVIMENTO SUSTENTAVEL EM REGIOES SEMI-ARIDAS-ICID, 1992. Fortaleza, CE. Anais... Fortaleza: Governo do Estado do Ceara/Fundacao Esquel/FIEC/CNI/BNB, 1993.$gv.2, p.447-480.
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Embrapa Semiárido (CPATSA) |
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Registro Completo
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
25/08/2016 |
Data da última atualização: |
02/09/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
OTTONI FILHO, T. B.; LEAL, I. F.; MACEDO, J. R. de; REIS, B. C. B. |
Afiliação: |
THEOPHILO B. OTTONI FILHO, UFRJ; ISAIAS F. LEAL, UFRJ; JOSE RONALDO DE MACEDO, CNPS; BRUNO C. B. REIS, UFRJ. |
Título: |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
Ano de publicação: |
2016 |
Fonte/Imprenta: |
Journal of Agricultural Science, v. 8, n. 8, p. 158-170, 2016. |
DOI: |
10.5539/jas.v8n8p158 |
Idioma: |
Inglês |
Conteúdo: |
Despite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC. MenosDespite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers F... Mostrar Tudo |
Palavras-Chave: |
Capacidade de campo; Drenagem interna; Funções de pedotransferência. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/146729/1/2016-026.pdf
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Marc: |
LEADER 02338naa a2200205 a 4500 001 2051668 005 2020-09-02 008 2016 bl uuuu u00u1 u #d 024 7 $a10.5539/jas.v8n8p158$2DOI 100 1 $aOTTONI FILHO, T. B. 245 $aAn algebraic pedotransfer function to calculate standardized in situ determined field capacity.$h[electronic resource] 260 $c2016 520 $aDespite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC. 653 $aCapacidade de campo 653 $aDrenagem interna 653 $aFunções de pedotransferência 700 1 $aLEAL, I. F. 700 1 $aMACEDO, J. R. de 700 1 $aREIS, B. C. B. 773 $tJournal of Agricultural Science$gv. 8, n. 8, p. 158-170, 2016.
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