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Registro Completo |
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
26/05/1994 |
Data da última atualização: |
26/05/1994 |
Autoria: |
EMERENCIANO, D. B. |
Título: |
Avaliacao de metodos de prognose da altura aplicados em Pinus elliottii da Floresta Nacional de Capao Bonito, SP |
Ano de publicação: |
1982 |
Fonte/Imprenta: |
Floresta, Curitiba, v.13, n.1, p.10-12, 1982 |
ISSN: |
0015-3826 |
Idioma: |
Português |
Notas: |
Resumo tese de mestrado. |
Thesagro: |
Altura; Pinus Elliottii. |
Thesaurus Nal: |
height. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00513naa a2200169 a 4500 001 1283301 005 1994-05-26 008 1982 bl uuuu u00u1 u #d 022 $a0015-3826 100 1 $aEMERENCIANO, D. B. 245 $aAvaliacao de metodos de prognose da altura aplicados em Pinus elliottii da Floresta Nacional de Capao Bonito, SP 260 $c1982 500 $aResumo tese de mestrado. 650 $aheight 650 $aAltura 650 $aPinus Elliottii 773 $tFloresta, Curitiba$gv.13, n.1, p.10-12, 1982
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Registro Completo
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
29/11/2020 |
Data da última atualização: |
11/02/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
SONG, G.; HAYES, M. H. B.; NOVOTNY, E. H. |
Afiliação: |
GUIXUE SONG, SHANDONG UNIVERSITY; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK; ETELVINO HENRIQUE NOVOTNY, CNPS. |
Título: |
A two-year incubation study of transformations of crop residues into soil organic matter (SOM) and a procedure for the sequential isolation and the fractionation of components of SOM. |
Ano de publicação: |
2021 |
Fonte/Imprenta: |
Science of the Total Environment, v. 763, 143034, Apr. 2021. |
DOI: |
https://doi.org/10.1016/j.scitotenv.2020.143034 |
Idioma: |
Inglês |
Conteúdo: |
Maize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in the solvent. That suggests that exhaustively pre-extracting soil with the NaOH/urea solvent system used will allow a truly representative humin to be obtained using the DMSO/acid solvent system. MenosMaize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in th... Mostrar Tudo |
Palavras-Chave: |
FTIR; NMR. |
Thesagro: |
Extração; Matéria Orgânica; Solo. |
Thesaurus NAL: |
Humification; Humin; Soil organic matter. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02519naa a2200253 a 4500 001 2127173 005 2021-02-11 008 2021 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.scitotenv.2020.143034$2DOI 100 1 $aSONG, G. 245 $aA two-year incubation study of transformations of crop residues into soil organic matter (SOM) and a procedure for the sequential isolation and the fractionation of components of SOM.$h[electronic resource] 260 $c2021 520 $aMaize (Zea mays) stover, with its natural C-13 abundance, was incubated for two years in a gravelly brown earth sandy loam soil that had been under long term cultivation to wheat (Triticum aestivum) for more than 30 years. The relative abundances of C-13 in the maize amendment allowed the contributions of the stover to be traced in the components of soil organic matter (SOM) isolated and fractionated using a sequential exhaustive extraction (SEE) process that gave 16 distinct fractions. These were caracterised using elemental, delta C-13, FTIR, and C-13 NMR analyses. Emphasis is placed on results for two years of incubation but to some extent data are compared with those for similar fractions taken after one year of incubation. Amounts of maize-derived organic carbon in the humic (HA) and fulvic (FA) isolates were more than twice those in the fractions after one year of incubation. The NMR results highlighted compositional differences between the fractions and showed increased contributions of lignin to the HAs and FAs (and especially in the cases of the HAs) as pH increased, and it was evident that humification was taking place after two years of incubation. The most recalcitrant humin fraction, isolated in the final solvent in the sequence, dimethylsulphoxide (DMSO) and sulfuric acid, is composed predominantly of methylene moieties, is compositionally and structurally very different from the humic and hydrophilic isolates, but identical to that which did not dissolve in the solvent. That suggests that exhaustively pre-extracting soil with the NaOH/urea solvent system used will allow a truly representative humin to be obtained using the DMSO/acid solvent system. 650 $aHumification 650 $aHumin 650 $aSoil organic matter 650 $aExtração 650 $aMatéria Orgânica 650 $aSolo 653 $aFTIR 653 $aNMR 700 1 $aHAYES, M. H. B. 700 1 $aNOVOTNY, E. H. 773 $tScience of the Total Environment$gv. 763, 143034, Apr. 2021.
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