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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
12/04/2022 |
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Data da última atualização: |
12/04/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BRAVO, C.; TONIOLO, R.; PELLEGRINI, E.; MILLO, C.; COVELLI, S.; CONTIN, M.; MARTIN NETO, L.; DE NOBILI, M. |
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Afiliação: |
LADISLAU MARTIN NETO, CNPDIA. |
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Título: |
Electron donating properties of humic acids in saltmarsh soils reflect soil geochemical characteristics. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Geoderma, v. 419, 115872, 2022. |
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Páginas: |
1 - 11 |
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ISSN: |
0016-7061 |
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DOI: |
https://doi.org/10.1016/j.geoderma.2022.115872 |
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Idioma: |
Inglês |
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Conteúdo: |
In saltmarsh soils, humic acids (HA) are involved in geochemically important redox processes. The electron donating capacity (EDC) of HA depends on their molecular structure, but also reflects the intensity of biological reduction in tidal environments. We examined twelve soils in three saltmarshes located along a geographical gradient and applied a specific sequential extraction procedure for the isolation of HA fractions bound (BHA) or not (FHA) to the mineral matrix by Ca2+ bridges, and investigated the relationships of their properties, in particular their EDC, with the biogeochemical characteristics of the soils. Spectroscopic assessment was carried out by UV–vis, FTIR and 13C NMR, quantification and characterization of radicals was performed by electron paramagnetic resonance (EPR) spectroscopy. The EDC was determined by using the 2,2′ -azinobis-(3-ethylbenzothiazolinesulfonic acid) (ABTS) decolorization assay and experimental data were fitted to a biphasic model to calculate the contributions of the fast and slow reactions to electron transfer. The results confirmed that the two HA fractions possess different structural characteristics and that BHA present higher EDC values compared to FHA. The EDC of both fractions is strongly related to the geochemical characteristics of soils, and represents an easily measured and highly informative parameter to understand mechanisms affecting redox processes in transitional environments. |
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Palavras-Chave: |
ABTS; EDC; Redox. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02219naa a2200277 a 4500
001 2142167
005 2022-04-12
008 2022 bl uuuu u00u1 u #d
022 $a0016-7061
024 7 $ahttps://doi.org/10.1016/j.geoderma.2022.115872$2DOI
100 1 $aBRAVO, C.
245 $aElectron donating properties of humic acids in saltmarsh soils reflect soil geochemical characteristics.$h[electronic resource]
260 $c2022
300 $a1 - 11
520 $aIn saltmarsh soils, humic acids (HA) are involved in geochemically important redox processes. The electron donating capacity (EDC) of HA depends on their molecular structure, but also reflects the intensity of biological reduction in tidal environments. We examined twelve soils in three saltmarshes located along a geographical gradient and applied a specific sequential extraction procedure for the isolation of HA fractions bound (BHA) or not (FHA) to the mineral matrix by Ca2+ bridges, and investigated the relationships of their properties, in particular their EDC, with the biogeochemical characteristics of the soils. Spectroscopic assessment was carried out by UV–vis, FTIR and 13C NMR, quantification and characterization of radicals was performed by electron paramagnetic resonance (EPR) spectroscopy. The EDC was determined by using the 2,2′ -azinobis-(3-ethylbenzothiazolinesulfonic acid) (ABTS) decolorization assay and experimental data were fitted to a biphasic model to calculate the contributions of the fast and slow reactions to electron transfer. The results confirmed that the two HA fractions possess different structural characteristics and that BHA present higher EDC values compared to FHA. The EDC of both fractions is strongly related to the geochemical characteristics of soils, and represents an easily measured and highly informative parameter to understand mechanisms affecting redox processes in transitional environments.
653 $aABTS
653 $aEDC
653 $aRedox
700 1 $aTONIOLO, R.
700 1 $aPELLEGRINI, E.
700 1 $aMILLO, C.
700 1 $aCOVELLI, S.
700 1 $aCONTIN, M.
700 1 $aMARTIN NETO, L.
700 1 $aDE NOBILI, M.
773 $tGeoderma$gv. 419, 115872, 2022.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
22/09/2021 |
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Data da última atualização: |
22/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
CASTRO, T. da C.; CARVALHO, J. O. P. de; SCHWARTZ, G.; SILVA, J. N. M.; RUSCHEL, A. R.; FREITAS, L. J. M. de; GOMES, J. M.; PINTO, R. de S. |
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Afiliação: |
TATIANA DA CUNHA CASTRO, UFPA; JOÃO OLEGÁRIO PEREIRA DE CARVALHO, UFRA; GUSTAVO SCHWARTZ, CPATU; JOSÉ NATALINO MACEDO SILVA, UFRA; ADEMIR ROBERTO RUSCHEL, CPATU; LUCAS JOSE MAZZEI DE FREITAS, CPATU; JAQUELINE MACEDO GOMES, UNITINS; ROSEANE DE SIQUEIRA PINTO, UFRA. |
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Título: |
The continuous timber production over cutting cycles in the Brazilian Amazon depends on volumes of species not harvested in previous cuts. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Forest Ecology and Management, v. 490, 119124, 2021. |
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DOI: |
10.1016/j.foreco.2021.119124 |
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Idioma: |
Inglês |
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Conteúdo: |
Can heavily logged Amazonian dense forests produce commercial timber for a second harvest under a 25?35-year cutting cycle? To address this question, we evaluated the forest capacity to recover the volume extracted 32 years after heavy logging (90 m3 ha?1) in a 144-ha research area located in the Tapajós National Forest, Brazil (03°18?31? to 03°19?21? S; 54°56?28? to 54°56?15? W). Abundance (number of trees ha?1), basal area (m2 ha?1) and volume (m3 ha?1) were assessed in two censuses, one year before logging (1981) and 32 years after logging (2014) to evaluate the status of the timber stock. Canopy openings caused by logging and silvicultural treatments increased sunlight in the forest and boosted the growth of trees 5?45 cm in DBH. Light-demanding species accounted for most of the increase in density and timber volume in the study area after logging. Our findings indicated that 32 years after the first cut, the forest was not able to replace the volume extracted. Considering the present Brazilian forest management regulations, which allow a logging intensity of 30 m3 ha?1 in a 35-year cutting cycle, this volume could only be harvested if new species not logged in the first cut were included in the new species logging list. |
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Palavras-Chave: |
Annual allowable cut; Second cut; Timber yields. |
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Thesagro: |
Madeira. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/226315/1/1-s2.0-S0378112721002127-main.pdf
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Marc: |
LEADER 02110naa a2200277 a 4500
001 2134706
005 2021-09-22
008 2021 bl uuuu u00u1 u #d
024 7 $a10.1016/j.foreco.2021.119124$2DOI
100 1 $aCASTRO, T. da C.
245 $aThe continuous timber production over cutting cycles in the Brazilian Amazon depends on volumes of species not harvested in previous cuts.$h[electronic resource]
260 $c2021
520 $aCan heavily logged Amazonian dense forests produce commercial timber for a second harvest under a 25?35-year cutting cycle? To address this question, we evaluated the forest capacity to recover the volume extracted 32 years after heavy logging (90 m3 ha?1) in a 144-ha research area located in the Tapajós National Forest, Brazil (03°18?31? to 03°19?21? S; 54°56?28? to 54°56?15? W). Abundance (number of trees ha?1), basal area (m2 ha?1) and volume (m3 ha?1) were assessed in two censuses, one year before logging (1981) and 32 years after logging (2014) to evaluate the status of the timber stock. Canopy openings caused by logging and silvicultural treatments increased sunlight in the forest and boosted the growth of trees 5?45 cm in DBH. Light-demanding species accounted for most of the increase in density and timber volume in the study area after logging. Our findings indicated that 32 years after the first cut, the forest was not able to replace the volume extracted. Considering the present Brazilian forest management regulations, which allow a logging intensity of 30 m3 ha?1 in a 35-year cutting cycle, this volume could only be harvested if new species not logged in the first cut were included in the new species logging list.
650 $aAmazonia
650 $aMadeira
653 $aAnnual allowable cut
653 $aSecond cut
653 $aTimber yields
700 1 $aCARVALHO, J. O. P. de
700 1 $aSCHWARTZ, G.
700 1 $aSILVA, J. N. M.
700 1 $aRUSCHEL, A. R.
700 1 $aFREITAS, L. J. M. de
700 1 $aGOMES, J. M.
700 1 $aPINTO, R. de S.
773 $tForest Ecology and Management$gv. 490, 119124, 2021.
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