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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Semiárido; Embrapa Solos. |
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Data corrente: |
05/01/2007 |
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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: |
NOVOTNY, E. H.; AZEVEDO, E. R. de; BONAGAMBA, T. J.; CUNHA, T. J. F.; MADARI, B. E.; BENITES, V. de M.; HAYES, M. H. B. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; TONY JARBAS FERREIRA CUNHA, CPATSA; BEATA EMOKE MADARI, CNPAF; VINICIUS DE MELO BENITES, CNPS. |
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Título: |
Studies of the compositions of humic acids from Amazonian Dark Earth soils. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Environmental Science & Technology, v. 41, n. 2, p. 400-405, jan. 2007. |
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Idioma: |
Inglês |
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Conteúdo: |
The compositions of humic acids (HAs) isolated from cultivated and forested "Terra Preta de Índio" or Amazonian Dark Earth soils (anthropogenic soils) were compared with those from adjacent non-anthropogenic soils (control soils) using elemental and thermogravimetric analyses, and a variety of solid-state nuclear magnetic resonance techniques. The thermogravimetric index, which indicates the molecular thermal resistance, was greater for the anthropogenic soils than for the control soils suggesting polycyclic aromatic components in the former. The cultivated anthropogenic soils were more enriched in C and depleted in H than the anthropogenic soils under forest, as the result of the selective degradation of aliphatic structures and the possible enrichment of H-deficient condensed aromatic structures. The combination of variable amplitude cross-polarization (VACP) and chemical shift anisotropy with total suppression of spinning sidebands experiments with composite pi pulses could be used to quantify the aromaticity of the HAs from the anthropogenic soils. From principal component analysis, using the VACP spectra, it was possible to separate the different constituents of the HAs, such as the carboxylated aromatic structures, from the anthropogenic soils and plant derived compounds. The data show that the HAs from anthropogenic soils have high contents of aryl and ionisable oxygenated functional groups, and the major functionalities from adjacent control soils are oxygenated functional groups from labile structures (carbohydrates, peptides, and with evidence for lignin structures). The anthropogenic soils HAs can be considered to be more recalcitrant, and with more stable reactive functional groups which may, in part, explain their more sustainable fertility due to the organic matter contribution to the soil cation exchange capacity. MenosThe compositions of humic acids (HAs) isolated from cultivated and forested "Terra Preta de Índio" or Amazonian Dark Earth soils (anthropogenic soils) were compared with those from adjacent non-anthropogenic soils (control soils) using elemental and thermogravimetric analyses, and a variety of solid-state nuclear magnetic resonance techniques. The thermogravimetric index, which indicates the molecular thermal resistance, was greater for the anthropogenic soils than for the control soils suggesting polycyclic aromatic components in the former. The cultivated anthropogenic soils were more enriched in C and depleted in H than the anthropogenic soils under forest, as the result of the selective degradation of aliphatic structures and the possible enrichment of H-deficient condensed aromatic structures. The combination of variable amplitude cross-polarization (VACP) and chemical shift anisotropy with total suppression of spinning sidebands experiments with composite pi pulses could be used to quantify the aromaticity of the HAs from the anthropogenic soils. From principal component analysis, using the VACP spectra, it was possible to separate the different constituents of the HAs, such as the carboxylated aromatic structures, from the anthropogenic soils and plant derived compounds. The data show that the HAs from anthropogenic soils have high contents of aryl and ionisable oxygenated functional groups, and the major functionalities from adjacent control soils are oxygenated func... Mostrar Tudo |
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Palavras-Chave: |
Ácido húmico; Composição; Terra Preta de Índio. |
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Thesagro: |
Solo; Solo Ácido; Solo Florestal. |
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Thesaurus Nal: |
Amazonia; Anthropogenic soil types; Humic acids; Soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/177112/1/Separata-00453.pdf
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Marc: |
LEADER 02743naa a2200313 a 4500
001 1158055
005 2021-09-16
008 2007 bl uuuu u00u1 u #d
100 1 $aNOVOTNY, E. H.
245 $aStudies of the compositions of humic acids from Amazonian Dark Earth soils.$h[electronic resource]
260 $c2007
520 $aThe compositions of humic acids (HAs) isolated from cultivated and forested "Terra Preta de Índio" or Amazonian Dark Earth soils (anthropogenic soils) were compared with those from adjacent non-anthropogenic soils (control soils) using elemental and thermogravimetric analyses, and a variety of solid-state nuclear magnetic resonance techniques. The thermogravimetric index, which indicates the molecular thermal resistance, was greater for the anthropogenic soils than for the control soils suggesting polycyclic aromatic components in the former. The cultivated anthropogenic soils were more enriched in C and depleted in H than the anthropogenic soils under forest, as the result of the selective degradation of aliphatic structures and the possible enrichment of H-deficient condensed aromatic structures. The combination of variable amplitude cross-polarization (VACP) and chemical shift anisotropy with total suppression of spinning sidebands experiments with composite pi pulses could be used to quantify the aromaticity of the HAs from the anthropogenic soils. From principal component analysis, using the VACP spectra, it was possible to separate the different constituents of the HAs, such as the carboxylated aromatic structures, from the anthropogenic soils and plant derived compounds. The data show that the HAs from anthropogenic soils have high contents of aryl and ionisable oxygenated functional groups, and the major functionalities from adjacent control soils are oxygenated functional groups from labile structures (carbohydrates, peptides, and with evidence for lignin structures). The anthropogenic soils HAs can be considered to be more recalcitrant, and with more stable reactive functional groups which may, in part, explain their more sustainable fertility due to the organic matter contribution to the soil cation exchange capacity.
650 $aAmazonia
650 $aAnthropogenic soil types
650 $aHumic acids
650 $aSoil
650 $aSolo
650 $aSolo Ácido
650 $aSolo Florestal
653 $aÁcido húmico
653 $aComposição
653 $aTerra Preta de Índio
700 1 $aAZEVEDO, E. R. de
700 1 $aBONAGAMBA, T. J.
700 1 $aCUNHA, T. J. F.
700 1 $aMADARI, B. E.
700 1 $aBENITES, V. de M.
700 1 $aHAYES, M. H. B.
773 $tEnvironmental Science & Technology$gv. 41, n. 2, p. 400-405, jan. 2007.
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Registro original: |
Embrapa Semiárido (CPATSA) |
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Origem |
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Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
11/11/1998 |
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Data da última atualização: |
08/10/2012 |
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Autoria: |
MENDES, A. M.; RICCI, M. dos S. F. |
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Afiliação: |
Embrapa Rondonia - Cx. Postal 406 CEP 78900-000 Porto Velho, RO. |
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Título: |
Amostragem de solos para análise quimica. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Porto Velho: Embrapa-CPAF Rondônia, 1998. |
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Páginas: |
13 p. |
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Série: |
(Embrapa-CPAF Rondônia. Circular Técnica, 33). |
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Idioma: |
Português |
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Conteúdo: |
Seleção e identificação da área; Época de amostragem; Profundidade de de amostragem; Local execução de amostragem; Freqüência de amostragem; |
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Palavras-Chave: |
Amostragem de solo. |
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Thesagro: |
Análise Química; Solo. |
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Thesaurus NAL: |
analytical methods; sampling; soil. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/67487/1/CPAF-RO-DOCUMENTOS-33-AMOSTRAGEM-DE-SOLOS-PARA-ANALISE-QUIMICA-FL-11409.pdf
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Marc: |
LEADER 00730nam a2200217 a 4500
001 1700851
005 2012-10-08
008 1998 bl uuuu u0uu1 u #d
100 1 $aMENDES, A. M.
245 $aAmostragem de solos para análise quimica.
260 $aPorto Velho: Embrapa-CPAF Rondônia$c1998
300 $a13 p.
490 $a(Embrapa-CPAF Rondônia. Circular Técnica, 33).
520 $aSeleção e identificação da área; Época de amostragem; Profundidade de de amostragem; Local execução de amostragem; Freqüência de amostragem;
650 $aanalytical methods
650 $asampling
650 $asoil
650 $aAnálise Química
650 $aSolo
653 $aAmostragem de solo
700 1 $aRICCI, M. dos S. F.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
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