|
|
Registros recuperados : 13 | |
6. | | WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. Aggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil. Geoderma, Amsterdam, v.90, p.277-290, 1999. Biblioteca(s): Embrapa Cerrados. |
| |
7. | | WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.64-76. Biblioteca(s): Embrapa Cerrados. |
| |
9. | | GONZÁLEZ-PÉREZ, M.; BUURMAN, P.; VIDAL-TORRADO, P.; MARTIN NETO, L. Pyrolysis-gas chromatography/mass spectrometry characterization of humic acids in spodosols under tropical rain forest in southeastern Brazil. In: MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 15., 2010, Puerto de la Cruz, ES. Advances in natural organic matter and humic substances research 2008-2010: proceedings. [S. l.: s. n.], 2010. v. 2. p. 329-332. J. A. González-Pérez, F. J. González-Vila, G. Almendros, Eds. Biblioteca(s): Embrapa Instrumentação. |
| |
10. | | FERREIRA, F. P.; VIDAL-TORRADO, P.; OTERO, X. L.; BUURMAN, P.; MARTIN NETO, L.; BOLUDA, R.; MACIAS, F. Chemical and spectroscopic characteristics of humic acids in marshes from the Iberian Peninsula. Journal of Soils and Sediments, Berlin, v. 13, n. 2, p. 253-264, 2013. Biblioteca(s): Embrapa Instrumentação. |
| |
12. | | VIDAL-TORRADO, P.; BUURMAN, P.; MARTINEZ, P.; LOPES-MAZZETTO, J. M.; SCHELLEKENS, J.; COELHO, M. R.; GOMES, F. H. Soils of restingas. In: SCHAEFER, C. E. G. R. (ed.). The soils of Brazil. Cham: Springer, 2023. cap. 14, p. 393-410. (World soils book series). Biblioteca(s): Embrapa Solos. |
| |
13. | | SANTOS, S. R. dos; SCHELLEKENS, J.; BUURMAN, P.; CORNELIS, J-T.; VANCAMPENHOUT, K.; SILVA, W. T. L. da; CAMARGO, P. B. de; VIDAL-TORRADO, P. Selective sorption and desorption of DOM in Podzol horizons - DOC and aluminium contents of leachates from a column experiment. Science of the Total Environment, v. 872. 162234, 2023. 1 - 10 Biblioteca(s): Embrapa Instrumentação. |
| |
Registros recuperados : 13 | |
|
|
| 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 |
Fechar
|
Nenhum registro encontrado para a expressão de busca informada. |
|
|