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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Agropecuária Oeste; Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Rondônia; Embrapa Tabuleiros Costeiros; Embrapa Unidades Centrais. |
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Data corrente: |
09/03/1998 |
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Data da última atualização: |
21/10/2016 |
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Autoria: |
FERNANDES, M. F.; FERNANDES, R. P. M. |
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Afiliação: |
MARCELO FERREIRA FERNANDES, CPATC. |
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Título: |
Quantificação e isolamento de bactérias diazotróficas associadas a coqueiro (Cocos nucifera L.). |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Aracaju: Embrapa-CPATC, 1997. |
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Páginas: |
3 p. |
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Série: |
(Embrapa-CPATC. Pesquisa em Andamento, 23). |
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Idioma: |
Português |
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Conteúdo: |
O presente estudo tem como objetivo avaliar a presença dessas bacterias em coqueiros, bem como sua quantificação, isolamento e caracterizações morfologica, cultural e bioquímica e quanto a capacidade de fixação de nitrogênio. |
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Palavras-Chave: |
Bacteria diazotrofica; Bacteria fixadora; Bacterias; Bradirrizobio; Brasil; Coconut; Cocos; Coqueiro; Diazotrófica; Fixacao; Nitrogen fixing bacteria; Rizobio; Sergipe. |
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Thesagro: |
Bactéria; Coco; Cocos Nucifera; Espécie; Fixação de Nitrogênio; Nitrogênio; Rhizobium. |
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Thesaurus Nal: |
Bradyrhizobium. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/87943/1/CPATC-PESQ.-AND.-23-97.pdf
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Marc: |
LEADER 01279nam a2200397 a 4500
001 1359352
005 2016-10-21
008 1997 bl uuuu u0uu1 u #d
100 1 $aFERNANDES, M. F.
245 $aQuantificação e isolamento de bactérias diazotróficas associadas a coqueiro (Cocos nucifera L.).
260 $aAracaju: Embrapa-CPATC$c1997
300 $a3 p.
490 $a(Embrapa-CPATC. Pesquisa em Andamento, 23).
520 $aO presente estudo tem como objetivo avaliar a presença dessas bacterias em coqueiros, bem como sua quantificação, isolamento e caracterizações morfologica, cultural e bioquímica e quanto a capacidade de fixação de nitrogênio.
650 $aBradyrhizobium
650 $aBactéria
650 $aCoco
650 $aCocos Nucifera
650 $aEspécie
650 $aFixação de Nitrogênio
650 $aNitrogênio
650 $aRhizobium
653 $aBacteria diazotrofica
653 $aBacteria fixadora
653 $aBacterias
653 $aBradirrizobio
653 $aBrasil
653 $aCoconut
653 $aCocos
653 $aCoqueiro
653 $aDiazotrófica
653 $aFixacao
653 $aNitrogen fixing bacteria
653 $aRizobio
653 $aSergipe
700 1 $aFERNANDES, R. P. M.
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Registro original: |
Embrapa Tabuleiros Costeiros (CPATC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
29/12/2001 |
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Data da última atualização: |
07/06/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ROSCOE, R.; BUURMAN, P.; VELTHORST, E. J.; VASCONCELLOS, C. A. |
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Afiliação: |
EMBRAPA-CNPMS. |
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Título: |
Soil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in a cerrdo's oxisol. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 104, p. 185-202, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
In order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fraction was relatively recalcitrant. Charcoal fragments observed in the fraction suggested that the recalcitrance was probably due to charred material. MenosIn order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fractio... Mostrar Tudo |
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Palavras-Chave: |
Carbono organico; Densidade; Factionation; Fragmentacao; Isotop; Organic carbon; Particlesize; Particula; Savanna. |
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Thesagro: |
Cerrado; Isótopo; Matéria Orgânica; Solo; Tamanho. |
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Thesaurus NAL: |
density; organic matter; soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02623naa a2200361 a 4500
001 1485178
005 2018-06-07
008 2001 bl uuuu u00u1 u #d
100 1 $aROSCOE, R.
245 $aSoil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in a cerrdo's oxisol.$h[electronic resource]
260 $c2001
520 $aIn order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fraction was relatively recalcitrant. Charcoal fragments observed in the fraction suggested that the recalcitrance was probably due to charred material.
650 $adensity
650 $aorganic matter
650 $asoil
650 $aCerrado
650 $aIsótopo
650 $aMatéria Orgânica
650 $aSolo
650 $aTamanho
653 $aCarbono organico
653 $aDensidade
653 $aFactionation
653 $aFragmentacao
653 $aIsotop
653 $aOrganic carbon
653 $aParticlesize
653 $aParticula
653 $aSavanna
700 1 $aBUURMAN, P.
700 1 $aVELTHORST, E. J.
700 1 $aVASCONCELLOS, C. A.
773 $tGeoderma, Amsterdam$gv. 104, p. 185-202, 2001.
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