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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/06/2003 |
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Data da última atualização: |
07/05/2008 |
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Autoria: |
CARVALHO, E. R.; MILORI, D. M. B. P.; NOVOTNY, E. H.; ARAUJO, A. B.; FLORENTINO, A. O.; ROCHA, J. C.; MARTIN-NETO, L. |
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Afiliação: |
Embrapa Instrumentação Agropecuária, São Carlos, SP. |
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Título: |
Spectroscoppic characterization of aquatic humic substances from tropical region and their interaction with chlorine. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
In: INTERNATIONAL HUMIC SUBSTANCES SOCIETY-IHSS; ANNIVERSARY CONFERENCE, 20., 2002, Boston. IHSS 2002: humic substances: nature's most versatile materials.proceedings. Boston: Northeastern University, 2002. |
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Páginas: |
p. 291-294. |
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Idioma: |
Inglês |
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Conteúdo: |
The Tropical Aquatic Humic Substances studied showed predominant composition of fulvic acids. The condensation and humification degree, obtained from fluorescence spectra, were higher in the HA fraction when compared to FA fraction and AHS. The relative fluorescence intensity for the samples was significantly decreased with the increasing of chlorine dose and reaction time. Combined data of fluorescence and size exclusion chromatography suggested that FA molecules after reaction with chlorine present a decrease of the apparent molecular size. |
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Palavras-Chave: |
Aquatic humic substances; Espectroscopia; Região tropical; Substâncias húmicas aquáticas. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01471naa a2200253 a 4500
001 1024757
005 2008-05-07
008 2002 bl --- 0-- u #d
100 1 $aCARVALHO, E. R.
245 $aSpectroscoppic characterization of aquatic humic substances from tropical region and their interaction with chlorine.
260 $c2002
300 $ap. 291-294.
520 $aThe Tropical Aquatic Humic Substances studied showed predominant composition of fulvic acids. The condensation and humification degree, obtained from fluorescence spectra, were higher in the HA fraction when compared to FA fraction and AHS. The relative fluorescence intensity for the samples was significantly decreased with the increasing of chlorine dose and reaction time. Combined data of fluorescence and size exclusion chromatography suggested that FA molecules after reaction with chlorine present a decrease of the apparent molecular size.
653 $aAquatic humic substances
653 $aEspectroscopia
653 $aRegião tropical
653 $aSubstâncias húmicas aquáticas
700 1 $aMILORI, D. M. B. P.
700 1 $aNOVOTNY, E. H.
700 1 $aARAUJO, A. B.
700 1 $aFLORENTINO, A. O.
700 1 $aROCHA, J. C.
700 1 $aMARTIN-NETO, L.
773 $tIn: INTERNATIONAL HUMIC SUBSTANCES SOCIETY-IHSS; ANNIVERSARY CONFERENCE, 20., 2002, Boston. IHSS 2002: humic substances: nature's most versatile materials.proceedings. Boston: Northeastern University, 2002.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
30/11/2022 |
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Data da última atualização: |
02/12/2022 |
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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: |
TULIO, R. H.; RACHWAL, M. F. G.; ZANATTA, J. A.; SILVA, K. da; KASCHUK, G. |
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Afiliação: |
RAFAEL HENNEL TULIO; MARCOS FERNANDO GLUCK RACHWAL, CNPF; JOSILEIA ACORDI ZANATTA, CNPF; KRISLE DA SILVA, CNPF; GLACIELA KASCHUK. |
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Título: |
Physical, chemical and microbiological soil attributes influence soil greenhouse gases (GHGs) fluxes in Atlantic Forest and pine (Pinus taeda) plantations in Brazil. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Soil Use and Management, 2022. |
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DOI: |
https://doi.org/10.1111/sum.12864 |
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Idioma: |
Inglês |
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Conteúdo: |
Forest soils can be sources or sinks of greenhouse gases (GHGs) depending on soil attributes that affect biomass and activity of soil microorganisms involved in GHGs fluxes. In this work, we tested the hypothesis that soil physical, chemical, and microbiological attributes, under different forests ecosystems, affect the soil GHGs [nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4)] fluxes. The study was carried out in two locations in southern Brazil in 2019, with three experimental plots of 900 m2 in native forests of the Atlantic Forest biome and in loblolly pine (Pinus taeda) plantations. Air samples released from the soil surface were analyzed for concentration and flux of CO2, N2O and CH4. Soil samples were analyzed for chemical attributes, density (Ds), soil microporosity (MiPs), soil macroporosity (MaPs), total porosity (TP), water-filled pore space (WFPS), microbial biomass carbon (MB-C), basal respiration (BR), microbial (qMic) and metabolic (qCO2) quotient and activities of soil urease and ?-glucosidase enzymes. The seasons influenced the CO2 and N2O emissions, probably due to changes in seasonal conditions. However, native forests consumed more CH4 than pine plantations. Meanwhile, the native forests presented soils with lower Ds (average 21.5% lower), more TP (average 12.5% higher) and more moisture (average 33% higher), which improved the microbiological attributes of the soil (20% to 60 % more MB-C, 67% higher urease activity and 30% higher ?-glucosidase activity) compared to pine plantations. Native forests contributed more intensely to CH4 consumption than pine plantations because they present better physical, chemical and microbiological soil conditions. Therefore, it is possible that forestry practices that improve soil physical attributes are likely to contribute to increase CH4 consumption, and to reduce GHGs emissions in forest ecosystems MenosForest soils can be sources or sinks of greenhouse gases (GHGs) depending on soil attributes that affect biomass and activity of soil microorganisms involved in GHGs fluxes. In this work, we tested the hypothesis that soil physical, chemical, and microbiological attributes, under different forests ecosystems, affect the soil GHGs [nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4)] fluxes. The study was carried out in two locations in southern Brazil in 2019, with three experimental plots of 900 m2 in native forests of the Atlantic Forest biome and in loblolly pine (Pinus taeda) plantations. Air samples released from the soil surface were analyzed for concentration and flux of CO2, N2O and CH4. Soil samples were analyzed for chemical attributes, density (Ds), soil microporosity (MiPs), soil macroporosity (MaPs), total porosity (TP), water-filled pore space (WFPS), microbial biomass carbon (MB-C), basal respiration (BR), microbial (qMic) and metabolic (qCO2) quotient and activities of soil urease and ?-glucosidase enzymes. The seasons influenced the CO2 and N2O emissions, probably due to changes in seasonal conditions. However, native forests consumed more CH4 than pine plantations. Meanwhile, the native forests presented soils with lower Ds (average 21.5% lower), more TP (average 12.5% higher) and more moisture (average 33% higher), which improved the microbiological attributes of the soil (20% to 60 % more MB-C, 67% higher urease activity and 30% higher ?-glucosida... Mostrar Tudo |
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Thesagro: |
Pinus Taeda. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02546naa a2200193 a 4500
001 2149031
005 2022-12-02
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1111/sum.12864$2DOI
100 1 $aTULIO, R. H.
245 $aPhysical, chemical and microbiological soil attributes influence soil greenhouse gases (GHGs) fluxes in Atlantic Forest and pine (Pinus taeda) plantations in Brazil.$h[electronic resource]
260 $c2022
520 $aForest soils can be sources or sinks of greenhouse gases (GHGs) depending on soil attributes that affect biomass and activity of soil microorganisms involved in GHGs fluxes. In this work, we tested the hypothesis that soil physical, chemical, and microbiological attributes, under different forests ecosystems, affect the soil GHGs [nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4)] fluxes. The study was carried out in two locations in southern Brazil in 2019, with three experimental plots of 900 m2 in native forests of the Atlantic Forest biome and in loblolly pine (Pinus taeda) plantations. Air samples released from the soil surface were analyzed for concentration and flux of CO2, N2O and CH4. Soil samples were analyzed for chemical attributes, density (Ds), soil microporosity (MiPs), soil macroporosity (MaPs), total porosity (TP), water-filled pore space (WFPS), microbial biomass carbon (MB-C), basal respiration (BR), microbial (qMic) and metabolic (qCO2) quotient and activities of soil urease and ?-glucosidase enzymes. The seasons influenced the CO2 and N2O emissions, probably due to changes in seasonal conditions. However, native forests consumed more CH4 than pine plantations. Meanwhile, the native forests presented soils with lower Ds (average 21.5% lower), more TP (average 12.5% higher) and more moisture (average 33% higher), which improved the microbiological attributes of the soil (20% to 60 % more MB-C, 67% higher urease activity and 30% higher ?-glucosidase activity) compared to pine plantations. Native forests contributed more intensely to CH4 consumption than pine plantations because they present better physical, chemical and microbiological soil conditions. Therefore, it is possible that forestry practices that improve soil physical attributes are likely to contribute to increase CH4 consumption, and to reduce GHGs emissions in forest ecosystems
650 $aPinus Taeda
700 1 $aRACHWAL, M. F. G.
700 1 $aZANATTA, J. A.
700 1 $aSILVA, K. da
700 1 $aKASCHUK, G.
773 $tSoil Use and Management, 2022.
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