|
|
| 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 |
Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
29/12/2001 |
Data da última atualização: |
07/06/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ROSCOE, R.; BUURMAN, P.; VELTHORST, E. J.; VASCONCELLOS, C. A. |
Afiliação: |
EMBRAPA-CNPMS. |
Título: |
Soil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in a cerrdo's oxisol. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Geoderma, Amsterdam, v. 104, p. 185-202, 2001. |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Carbono organico; Densidade; Factionation; Fragmentacao; Isotop; Organic carbon; Particlesize; Particula; Savanna. |
Thesagro: |
Cerrado; Isótopo; Matéria Orgânica; Solo; Tamanho. |
Thesaurus Nal: |
density; organic matter; soil. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
Registro Completo
Biblioteca(s): |
Embrapa Suínos e Aves. |
Data corrente: |
16/06/1999 |
Data da última atualização: |
30/05/2019 |
Tipo da produção científica: |
Documentos |
Autoria: |
OLIVEIRA, P. A. V. de (coord.). |
Afiliação: |
PAULO ARMANDO VICTORIA DE OLIVEIRA, CNPSA. |
Título: |
Manual de manejo e utilização dos dejetos de suínos. |
Ano de publicação: |
1993 |
Fonte/Imprenta: |
Concórdia: EMBRAPA-CNPSA, 1993. |
Páginas: |
188 p. |
Série: |
(EMBRAPA-CNPSA. Documentos, 27). |
Idioma: |
Português |
Conteúdo: |
Caracteristicas principais dos dejetos; Principais técnicas de tratamento dos dejetos; Tratamento de dejetos nas pequenas e grandes propriedades produtoras de suínos; Técnicas de valorização dos dejetos suínos e seus produtos; Controle integrado de moscas nas criações de suínos; Técnicas construtivas em edificações para o aproveitamento dos dejetos. |
Palavras-Chave: |
Adubacao organica; Control; Controle; Fly; Management; Organic Fertilizer; Utilizacao; Waste. |
Thesagro: |
Dejeto; Manejo; Mosca; Poluição; Suíno. |
Thesaurus NAL: |
pollution; swine. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/31901/1/publicacao-doc-27.pdf
|
Marc: |
LEADER 01112nam a2200313 a 4500 001 1434003 005 2019-05-30 008 1993 bl uuuu 00u1 u #d 100 1 $aOLIVEIRA, P. A. V. de 245 $aManual de manejo e utilização dos dejetos de suínos. 260 $aConcórdia: EMBRAPA-CNPSA$c1993 300 $a188 p. 490 $a(EMBRAPA-CNPSA. Documentos, 27). 520 $aCaracteristicas principais dos dejetos; Principais técnicas de tratamento dos dejetos; Tratamento de dejetos nas pequenas e grandes propriedades produtoras de suínos; Técnicas de valorização dos dejetos suínos e seus produtos; Controle integrado de moscas nas criações de suínos; Técnicas construtivas em edificações para o aproveitamento dos dejetos. 650 $apollution 650 $aswine 650 $aDejeto 650 $aManejo 650 $aMosca 650 $aPoluição 650 $aSuíno 653 $aAdubacao organica 653 $aControl 653 $aControle 653 $aFly 653 $aManagement 653 $aOrganic Fertilizer 653 $aUtilizacao 653 $aWaste
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Suínos e Aves (CNPSA) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Expressão de busca inválida. Verifique!!! |
|
|