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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Solos. |
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Data corrente: |
10/01/2007 |
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Data da última atualização: |
16/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BENITES, V. de M.; MACHADO, P. L. O. de A.; FIDALGO, E. C. C.; COELHO, M. R.; MADARI, B. E. |
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Afiliação: |
VINICIUS DE MELO BENITES, CNPS; PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPAF; ELAINE CRISTINA CARDOSO FIDALGO, CNPS; MAURICIO RIZZATO COELHO, CNPS; BEATA EMOKE MADARI, CNPAF. |
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Título: |
Pedotransfer functions for estimating soil bulk density from existing soil survey reports in Brazil. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Geoderma, v. 139, n. 1/2, p. 90-97, Apr. 2007. |
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DOI: |
https://doi.org/10.1016/j.geoderma.2007.01.005 |
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Idioma: |
Inglês |
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Conteúdo: |
Soil bulk density (Db) measurement is essential to estimate soil carbon reserves. However, field sampling, specially at depth, and direct measurement of Db is labor intensive, tedious and often impractical. Thus regression models or pedotransfer functions (PTFs) based on easily measured soil properties are an alternative for laborious Db measurements. A forward stepwise multiple regression routine was used to predict Db from 17 soil properties using a data set (data set 1) constructed from the Soil Archives of Embrapa Solos, Rio de Janeiro, Brazil. A first exploratory regression model using 1002 soil samples of data set 1 led to the development of a model, which indicated that total nitrogen (N), clay content (Clay) and sum of basic cations (SB) were the three strongest contributors to Db prediction (Adjusted-R2=0.71, Standard error of the estimate=0.10). A simplified regression model was developed using easily-measured soil attributes, such as soil organic carbon (TOC), Clay and SB. This model described 66% of the variation of Db in 1396 soil samples distributed at all depths (Standard error of the estimate=0.11). Clay content showed a good correlation with predicted Db (Beta value=-0.58) followed by TOC (Beta value=-0.51) and SB (Beta value=0.21). Partitioning the data set 1 into groups by soil depth (0?30 and 30?100 cm) and soil order (Latossolos and Argissolos) did not improve the accuracy of regression equations. In addition, we tested the Db predictive potential of the proposed model and three existing models (two from Brazil and one from the US) on an independent soil data set (data set 2). A general overestimation of predicted Db by the US model, with mean predicted error (MPE) of 0.11 shows that published PTFs developed on different environments should be used with care. Existing Brazilian models developed for the Amazon biome, on the other hand, were found to produce a slight underestimation with MPE values ranging from -0.03 to -0.16. The proposed simple regression model including Clay, TOC and SB was observed to be the most accurate and least biased. MenosSoil bulk density (Db) measurement is essential to estimate soil carbon reserves. However, field sampling, specially at depth, and direct measurement of Db is labor intensive, tedious and often impractical. Thus regression models or pedotransfer functions (PTFs) based on easily measured soil properties are an alternative for laborious Db measurements. A forward stepwise multiple regression routine was used to predict Db from 17 soil properties using a data set (data set 1) constructed from the Soil Archives of Embrapa Solos, Rio de Janeiro, Brazil. A first exploratory regression model using 1002 soil samples of data set 1 led to the development of a model, which indicated that total nitrogen (N), clay content (Clay) and sum of basic cations (SB) were the three strongest contributors to Db prediction (Adjusted-R2=0.71, Standard error of the estimate=0.10). A simplified regression model was developed using easily-measured soil attributes, such as soil organic carbon (TOC), Clay and SB. This model described 66% of the variation of Db in 1396 soil samples distributed at all depths (Standard error of the estimate=0.11). Clay content showed a good correlation with predicted Db (Beta value=-0.58) followed by TOC (Beta value=-0.51) and SB (Beta value=0.21). Partitioning the data set 1 into groups by soil depth (0?30 and 30?100 cm) and soil order (Latossolos and Argissolos) did not improve the accuracy of regression equations. In addition, we tested the Db predictive potential of the... Mostrar Tudo |
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Palavras-Chave: |
Carbono orgânico do solo; Clay content; Funções de pedotransferência; Validação do modelo. |
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Thesagro: |
Argila; Carbono; Solo; Solo Orgânico. |
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Thesaurus Nal: |
Clay; Model validation; Pedotransfer functions; Soil organic carbon. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03082naa a2200325 a 4500
001 1339174
005 2021-09-16
008 2007 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.geoderma.2007.01.005$2DOI
100 1 $aBENITES, V. de M.
245 $aPedotransfer functions for estimating soil bulk density from existing soil survey reports in Brazil.$h[electronic resource]
260 $c2007
520 $aSoil bulk density (Db) measurement is essential to estimate soil carbon reserves. However, field sampling, specially at depth, and direct measurement of Db is labor intensive, tedious and often impractical. Thus regression models or pedotransfer functions (PTFs) based on easily measured soil properties are an alternative for laborious Db measurements. A forward stepwise multiple regression routine was used to predict Db from 17 soil properties using a data set (data set 1) constructed from the Soil Archives of Embrapa Solos, Rio de Janeiro, Brazil. A first exploratory regression model using 1002 soil samples of data set 1 led to the development of a model, which indicated that total nitrogen (N), clay content (Clay) and sum of basic cations (SB) were the three strongest contributors to Db prediction (Adjusted-R2=0.71, Standard error of the estimate=0.10). A simplified regression model was developed using easily-measured soil attributes, such as soil organic carbon (TOC), Clay and SB. This model described 66% of the variation of Db in 1396 soil samples distributed at all depths (Standard error of the estimate=0.11). Clay content showed a good correlation with predicted Db (Beta value=-0.58) followed by TOC (Beta value=-0.51) and SB (Beta value=0.21). Partitioning the data set 1 into groups by soil depth (0?30 and 30?100 cm) and soil order (Latossolos and Argissolos) did not improve the accuracy of regression equations. In addition, we tested the Db predictive potential of the proposed model and three existing models (two from Brazil and one from the US) on an independent soil data set (data set 2). A general overestimation of predicted Db by the US model, with mean predicted error (MPE) of 0.11 shows that published PTFs developed on different environments should be used with care. Existing Brazilian models developed for the Amazon biome, on the other hand, were found to produce a slight underestimation with MPE values ranging from -0.03 to -0.16. The proposed simple regression model including Clay, TOC and SB was observed to be the most accurate and least biased.
650 $aClay
650 $aModel validation
650 $aPedotransfer functions
650 $aSoil organic carbon
650 $aArgila
650 $aCarbono
650 $aSolo
650 $aSolo Orgânico
653 $aCarbono orgânico do solo
653 $aClay content
653 $aFunções de pedotransferência
653 $aValidação do modelo
700 1 $aMACHADO, P. L. O. de A.
700 1 $aFIDALGO, E. C. C.
700 1 $aCOELHO, M. R.
700 1 $aMADARI, B. E.
773 $tGeoderma$gv. 139, n. 1/2, p. 90-97, Apr. 2007.
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Registro original: |
Embrapa Solos (CNPS) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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| Acesso ao texto completo restrito à biblioteca da Embrapa Agroindústria de Alimentos. Para informações adicionais entre em contato com ctaa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
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Data corrente: |
21/11/2014 |
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Data da última atualização: |
18/02/2016 |
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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: |
CANDÉA, T. V.; MONTEIRO, F. S.; TONON, R. V.; CABRAL, L. M. C. |
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Afiliação: |
TATIANA V. CANDÉA, New University of Lisbon; FLAVIA S. MONTEIRO, UFRJ; RENATA VALERIANO TONON, CTAA; LOURDES MARIA CORREA CABRAL, CTAA. |
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Título: |
Effect of process variables on the production of flaxseed oil emulsions by cross-flow membrane emulsification. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Food Engineering Reviews, 2014. |
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Páginas: |
4 p. |
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ISBN: |
1866-7929 |
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DOI: |
10.1007/s12393-014-9085-8 |
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Idioma: |
Inglês |
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Conteúdo: |
The aim of this work was to study the effect of process variables on the production of flaxseed oil emulsions by cross-flow membrane emulsification. The process was carried out using an ultrafiltration ?-alumina membrane with mean pore size of 0.2 µm, and Tween 20 was used as surfactant. The effect of transmembrane pressure (1.5?4.5 bar), cross-flow velocity (3?8 m/s) and surfactant concentration (1?3 %) on the dispersed phase flux, emulsion stability and droplet size distribution and uniformity was evaluated according to a 23 central composite experimental design. Results showed that all the emulsions presented unimodal droplets distribution, and the average droplet diameter was 1.50 ?m. Among all the variables studied, only transmembrane pressure had significant influence on the dispersed phase flux?the increase in transmembrane pressure resulted in higher dispersed phase flux. The other variables did not affect any of the analyzed responses within the studied ranges. |
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Palavras-Chave: |
A-Alumina membrane; Droplet size distribution; Emulsão alimentar; Flaxseed oil; Food emulsions; Membrane emulsification; Oil emulsions; Óleo de linhaça. |
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Thesagro: |
Emulsão; Óleo. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 01862naa a2200313 a 4500
001 2000730
005 2016-02-18
008 2014 bl uuuu u00u1 u #d
022 $a1866-7929
024 7 $a10.1007/s12393-014-9085-8$2DOI
100 1 $aCANDÉA, T. V.
245 $aEffect of process variables on the production of flaxseed oil emulsions by cross-flow membrane emulsification.
260 $c2014
300 $a4 p.
520 $aThe aim of this work was to study the effect of process variables on the production of flaxseed oil emulsions by cross-flow membrane emulsification. The process was carried out using an ultrafiltration ?-alumina membrane with mean pore size of 0.2 µm, and Tween 20 was used as surfactant. The effect of transmembrane pressure (1.5?4.5 bar), cross-flow velocity (3?8 m/s) and surfactant concentration (1?3 %) on the dispersed phase flux, emulsion stability and droplet size distribution and uniformity was evaluated according to a 23 central composite experimental design. Results showed that all the emulsions presented unimodal droplets distribution, and the average droplet diameter was 1.50 ?m. Among all the variables studied, only transmembrane pressure had significant influence on the dispersed phase flux?the increase in transmembrane pressure resulted in higher dispersed phase flux. The other variables did not affect any of the analyzed responses within the studied ranges.
650 $aEmulsão
650 $aÓleo
653 $aA-Alumina membrane
653 $aDroplet size distribution
653 $aEmulsão alimentar
653 $aFlaxseed oil
653 $aFood emulsions
653 $aMembrane emulsification
653 $aOil emulsions
653 $aÓleo de linhaça
700 1 $aMONTEIRO, F. S.
700 1 $aTONON, R. V.
700 1 $aCABRAL, L. M. C.
773 $tFood Engineering Reviews, 2014.
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Embrapa Agroindústria de Alimentos (CTAA) |
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