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| Registros recuperados : 17 | |
| 2. |  | POTES, M. da L.; DICK, D. P.; DALMOLIN, R. S.; KNICKER, H.; ROSA, A. S. da. Matéria orgânica em neossolos de altitude: influência do manejo da pastagem na sua composição e teor. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 34, n. 1, p. 23-32, jan./fev. 2010. Título em Inglês: Soil organic matter in highland leptosols: influence of pasture management on composition and content.| Biblioteca(s): Embrapa Solos / UEP-Recife. |
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| 3. | | DIEKOW, J.; MIELNICZUK, J.; GONZALEZ-VILA, F. J.; KNICKER, H.; BAYER, C.; MARTIN NETO, L. Matéria orgânica do solo em sistemas de culturas caracterizada por pirólise analítica. LATIN AMERICAM SYMPOSIUM ON SCANNING PROBE MICROSCOPY, 3., 2005, Ouro Preto. [Anais eletrônicos...]. Ouro Preto: SBMN, 2005. 1 CD-ROM.| Biblioteca(s): Embrapa Instrumentação. |
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| 5. | | NOVOTNY, E. H.; KNICKER, H.; MARTIN NETO, L.; AZEREDO, R. B. V.; HAYES, M. H. B. Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach. European Journal of Soil Science, Oxford, v. 59, n. 3, p. 439-444, Jun. 2008.| Biblioteca(s): Embrapa Solos. |
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| 11. | | LEAL, O. A.; DICK, D. P.; COSTA, F. de S.; KNICKER, H.; CARVALHO JÚNIOR, J. A. de; SANTOS, J. C. Carbon in physical fractions and organic matter chemical composition of an acrisol after amazon forest burning and conversion into pasture. Journal of the Brazilian Chemical Society, v. 30, n. 2, p. 413-424, 2019.| Biblioteca(s): Embrapa Acre. |
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| 12. | | GONZÁLEZ PÉREZ, M.; NUNO, C. S.; COLNAGO, L. A.; KNICKER, H.; TORRADO, P. V.; MARTIN NETO, L. Evaluation of magnetic field effect on quantification of aromatic components of humic acids by 13C CPMAS NMR. In: NUCLEAR MAGNETIC RESONANCE USERS MEETING, 11., 2007. Angra dos Reis.; WORKSHOP NMR IN SOUTH AMERICA, 2007. Angra dos Reis, RJ. Extended abstracts book... Angra dos reis, 2007. p. 101-102.| Biblioteca(s): Embrapa Instrumentação. |
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| 13. | | NOVOTNY, E. H.; MARTIN-NETO, L.; KNICKER, H.; DE MARIA, I. C.; DECHEN, S. C. F.; VIEIRA, S. R. Efeito de diferentes sistemas de preparo do solo nos ácidos húmicos - caracterização pela espectroscopia de ressonância magnética nuclear de 13C. In: ENCONTRO BRASILEIRO DE SUBSTÂNCIAS HÚMICAS-IHSS, 4., 2001, Viçosa. IHSS 2001: resumos de palestras e trabalhos apresentados. Viçosa: UFV-Departamento de Solos: Grupo Brasileiro da IHSS, 2001. p. 129-131.| Biblioteca(s): Embrapa Instrumentação. |
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| 14. | | DICK, D. P.; GONÇALVES, C. N.; DALMOLIN, R. S. D.; KNICKER, H.; KLAMT, E.; KÖGEL-KNABNER, I.; SIMÕES, M. L.; MARTIN-NETO, L. Characteristics of soil organic matter of different Brazilian ferrasols under native vegetation as a function of soil depth. Geoderma: an international journal of soil science , Amsterdam, v. 124, n. 3-4, p. 319-333, Feb. 2005. Disponível em: . Acesso em: 10 jan. 2006.| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | PÉREZ, M. G.; MARTIN-NETO, L.; SAAB, S. C.; NOVOTNY, E. H.; MILORI, D. M. B. P.; BAGNATO, V. S.; COLNAGO, L. A.; MELO, W. J.; KNICKER, H. Characterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy. Geoderma, Amsterdam, v. 118, p. 181-190, 2004.| Biblioteca(s): Embrapa Instrumentação. |
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| 16. | | BOENI, M.; BAYAER, C.; DIECKOW, J.; CONCEIÇÃO, P. C.; DICK, D. P.; KNICKER, H.; SALTON, J. C.; MACEDO, M. C. M. Organic matter composition in density fractions of Cerrado Ferralsolsas revealed by CPMAS13C NMR: influence of pastureland, croplandand integrated crop-livestock. ,Agrculture, Ecosystems & Environment, Amsterdan v. 181, 2013.| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 17. | | LEAL, O. dos A.; JIMÉNEZ-MORILLO, N. T.; GONZÁLEZ-PÉREZ, J. A.; KNICKER, H.; COSTA, F. de S.; JIMÉNEZ-MORILLO, P. N.; CARVALHO JUNIOR, J. A. de; SANTOS, J. C. dos; DICK, D. P. Soil organic matter molecular composition shifts driven by forest regrowth or pasture after slash-and-burn of Amazon Forest. International Journal of Environmental Research and Public Health, v. 20, n. 4, 3485, Feb. 2023.| Biblioteca(s): Embrapa Acre. |
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| Registros recuperados : 17 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
25/11/2004 |
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Data da última atualização: |
08/03/2010 |
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Autoria: |
PÉREZ, M. G.; MARTIN-NETO, L.; SAAB, S. C.; NOVOTNY, E. H.; MILORI, D. M. B. P.; BAGNATO, V. S.; COLNAGO, L. A.; MELO, W. J.; KNICKER, H. |
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Título: |
Characterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 118, p. 181-190, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
The importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was higher, showing that organic matter (OM) formed in this cases is less aromatic. The tluorescence intensities were in agreement with the percentage of aromatic carbons, determined by NMR (r=0.97 PMenosThe importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was... Mostrar Tudo |
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Palavras-Chave: |
EPR; FTIR; NMR; Nuclear; Ressonância magnética. |
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Categoria do assunto: |
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Marc: |
LEADER 02550naa a2200277 a 4500
001 1028683
005 2010-03-08
008 2004 bl --- 0-- u #d
100 1 $aPÉREZ, M. G.
245 $aCharacterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy.
260 $c2004
520 $aThe importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was higher, showing that organic matter (OM) formed in this cases is less aromatic. The tluorescence intensities were in agreement with the percentage of aromatic carbons, determined by NMR (r=0.97 P<O.OI) and with semiquinone content, determined by EPR (r=0.97 P<O.OI).
653 $aEPR
653 $aFTIR
653 $aNMR
653 $aNuclear
653 $aRessonância magnética
700 1 $aMARTIN-NETO, L.
700 1 $aSAAB, S. C.
700 1 $aNOVOTNY, E. H.
700 1 $aMILORI, D. M. B. P.
700 1 $aBAGNATO, V. S.
700 1 $aCOLNAGO, L. A.
700 1 $aMELO, W. J.
700 1 $aKNICKER, H.
773 $tGeoderma, Amsterdam$gv. 118, p. 181-190, 2004.
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