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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
13/12/2022 |
Data da última atualização: |
13/03/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
PEREIRA, M. G.; SILVA, R. C. da; PINHEIRO JUNIOR, C. R.; SILVA NETO E. C. da; FONTANA, A.; SCHIAVO, J. A.; MARANHÃO, D. D. C.; AZEVEDO, A. C. de; PACHECO, A. A. |
Afiliação: |
MARCOS GERVASIO PEREIRA, UNIVERSIDADE FEDERALRURAL DO RIO DE JANEIRO; RAFAEL CIPRIANO DA SILVA, FUNDAÇÃO CEARENSE DE METEOROLOGIA E RECURSOS HÍDRICOS; CARLOS ROBERTO PINHEIRO JUNIOR, UNIVERSIDADE FEDERALRURAL DO RIO DE JANEIRO; EDUARDO CARVALHO DA SILVA NETO, UNIVERSIDADE FEDERALRURAL DO RIO DE JANEIRO; ADEMIR FONTANA, CNPS; JOLIMAR ANTONIO SCHIAVO, UNIVERSIDADE ESTADUAL DO MATO GROSSO DO SUL; DEYVID DIEGO CARVALHO MARANHÃO, INSTITUTO DE EDUCAÇÃO, AGRICULTURA E AMBIENTE; ANTÔNIO CARLOS DE AZEVEDO, UNIVERSIDADE DE SÃO PAULO; ANDERSON ALMEIDA PACHECO, FUNDAÇÃO RENOVA. |
Título: |
A multi-proxy study of Umbric Ferralsols genesis in a high-mountain environment in Rio de Janeiro state. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Earth Surface Processes and Landforms, v. 48, n. 4, p. 721-734, Mar. 2023. |
DOI: |
https://doi.org/10.1002/esp.5513 |
Idioma: |
Inglês |
Conteúdo: |
The formation of strongly weathered soils of the tropics (Ferralsols) with high carbon stocks (thick A-horizon/umbric horizon) is still not understood. In order to contribute to the understanding of the formation of Umbric Ferralsols, we studied these soils in the highlands of Rio de Janeiro state (Brazil) from various perspectives. We analysed soil morphology, micromorphology, physical and chemical soil attributes, soil phytolith assemblages, and Delta13C isotopic composition in a multi-proxy study. The profiles presented ferralic horizons with SiO2/Al2O3 ratio (ki index) < 1.0, low silt/clay ratio values, predominance of kaolinite and presence of gibbsite, and low cation exchange capacity. These characteristics indicate a high degree of weathering and ferralitization. The isotopic and phytolithic variations indicate climatic modifications during the Late Holocene (approximately 2300 years ago), with a predominance of mixed vegetation composed of plants of the C3 and C4 photosynthetic cycles. This condition favoured the accumulation of organic matter in the Umbric Ferralsols. The accumulation of organic matter in subsurface B horizons occurred under drier past climatic conditions in a savanna environment, which may have favoured the occurrence of fires, thereby explaining the charcoal fragments identified in the micromorphological analyses. In contrast, the development of the umbric horizon in the profiles was favoured under wetter environmental conditions than the present environmental conditions, and favoured the development of vegetation and intense accumulation of organic material on the surface and at depths close to 100 cm. The pedogenesis of umbric horizons in Ferralsols reinforces the importance of bioturbation in the incorporation of organic matter, intensifying the humification and resulting in a strong darkening of the soil (melanization). MenosThe formation of strongly weathered soils of the tropics (Ferralsols) with high carbon stocks (thick A-horizon/umbric horizon) is still not understood. In order to contribute to the understanding of the formation of Umbric Ferralsols, we studied these soils in the highlands of Rio de Janeiro state (Brazil) from various perspectives. We analysed soil morphology, micromorphology, physical and chemical soil attributes, soil phytolith assemblages, and Delta13C isotopic composition in a multi-proxy study. The profiles presented ferralic horizons with SiO2/Al2O3 ratio (ki index) < 1.0, low silt/clay ratio values, predominance of kaolinite and presence of gibbsite, and low cation exchange capacity. These characteristics indicate a high degree of weathering and ferralitization. The isotopic and phytolithic variations indicate climatic modifications during the Late Holocene (approximately 2300 years ago), with a predominance of mixed vegetation composed of plants of the C3 and C4 photosynthetic cycles. This condition favoured the accumulation of organic matter in the Umbric Ferralsols. The accumulation of organic matter in subsurface B horizons occurred under drier past climatic conditions in a savanna environment, which may have favoured the occurrence of fires, thereby explaining the charcoal fragments identified in the micromorphological analyses. In contrast, the development of the umbric horizon in the profiles was favoured under wetter environmental conditions than the present ... Mostrar Tudo |
Palavras-Chave: |
Ferralitization; Organic carbon; Paleoenvironment evolution; Pedogenesis. |
Thesaurus Nal: |
Bioturbation. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02795naa a2200289 a 4500 001 2149571 005 2023-03-13 008 2023 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1002/esp.5513$2DOI 100 1 $aPEREIRA, M. G. 245 $aA multi-proxy study of Umbric Ferralsols genesis in a high-mountain environment in Rio de Janeiro state.$h[electronic resource] 260 $c2023 520 $aThe formation of strongly weathered soils of the tropics (Ferralsols) with high carbon stocks (thick A-horizon/umbric horizon) is still not understood. In order to contribute to the understanding of the formation of Umbric Ferralsols, we studied these soils in the highlands of Rio de Janeiro state (Brazil) from various perspectives. We analysed soil morphology, micromorphology, physical and chemical soil attributes, soil phytolith assemblages, and Delta13C isotopic composition in a multi-proxy study. The profiles presented ferralic horizons with SiO2/Al2O3 ratio (ki index) < 1.0, low silt/clay ratio values, predominance of kaolinite and presence of gibbsite, and low cation exchange capacity. These characteristics indicate a high degree of weathering and ferralitization. The isotopic and phytolithic variations indicate climatic modifications during the Late Holocene (approximately 2300 years ago), with a predominance of mixed vegetation composed of plants of the C3 and C4 photosynthetic cycles. This condition favoured the accumulation of organic matter in the Umbric Ferralsols. The accumulation of organic matter in subsurface B horizons occurred under drier past climatic conditions in a savanna environment, which may have favoured the occurrence of fires, thereby explaining the charcoal fragments identified in the micromorphological analyses. In contrast, the development of the umbric horizon in the profiles was favoured under wetter environmental conditions than the present environmental conditions, and favoured the development of vegetation and intense accumulation of organic material on the surface and at depths close to 100 cm. The pedogenesis of umbric horizons in Ferralsols reinforces the importance of bioturbation in the incorporation of organic matter, intensifying the humification and resulting in a strong darkening of the soil (melanization). 650 $aBioturbation 653 $aFerralitization 653 $aOrganic carbon 653 $aPaleoenvironment evolution 653 $aPedogenesis 700 1 $aSILVA, R. C. da 700 1 $aPINHEIRO JUNIOR, C. R. 700 1 $aSILVA NETO E. C. da 700 1 $aFONTANA, A. 700 1 $aSCHIAVO, J. A. 700 1 $aMARANHÃO, D. D. C. 700 1 $aAZEVEDO, A. C. de 700 1 $aPACHECO, A. A. 773 $tEarth Surface Processes and Landforms$gv. 48, n. 4, p. 721-734, Mar. 2023.
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Embrapa Solos (CNPS) |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
13/05/2003 |
Data da última atualização: |
03/08/2005 |
Autoria: |
GUIMARAES, C. M.; CASTRO, E. da M. de. |
Título: |
Arroz de terras altas no sistema plantio direto. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2002. |
Páginas: |
2 p. |
Série: |
(Embrapa Arroz e Feijão. Comunicado Técnico, 47). |
Idioma: |
Português |
Conteúdo: |
O presente trabalho foi conduzido com o objetivo de adequar o cultivo do arroz no Sistema Plantio Direto pela adoção de semeadoras e de genótipos mais adaptados ao sistema. |
Palavras-Chave: |
Adoção; Arroz de Terras Altas; Brasil; Cultivar; Cultivo; Direct sawing; Genótipos; Goiás; Mato Grosso; Planto direto; Semeadora; Sistema; Sistema de Plantio Direto; Sistema plantio direto; Terras altas; Zero tillage. |
Thesagro: |
Arroz; Genótipo; Oryza Sativa; Plantio Direto; Produtividade; Terra; Variedade. |
Thesaurus NAL: |
rice. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CNPAF/19921/1/comt_47.pdf
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Marc: |
LEADER 01278nam a2200433 a 4500 001 1210881 005 2005-08-03 008 2002 bl uuuu u0uu1 u #d 100 1 $aGUIMARAES, C. M. 245 $aArroz de terras altas no sistema plantio direto. 260 $aSanto Antônio de Goiás: Embrapa Arroz e Feijão$c2002 300 $a2 p. 490 $a(Embrapa Arroz e Feijão. Comunicado Técnico, 47). 520 $aO presente trabalho foi conduzido com o objetivo de adequar o cultivo do arroz no Sistema Plantio Direto pela adoção de semeadoras e de genótipos mais adaptados ao sistema. 650 $arice 650 $aArroz 650 $aGenótipo 650 $aOryza Sativa 650 $aPlantio Direto 650 $aProdutividade 650 $aTerra 650 $aVariedade 653 $aAdoção 653 $aArroz de Terras Altas 653 $aBrasil 653 $aCultivar 653 $aCultivo 653 $aDirect sawing 653 $aGenótipos 653 $aGoiás 653 $aMato Grosso 653 $aPlanto direto 653 $aSemeadora 653 $aSistema 653 $aSistema de Plantio Direto 653 $aSistema plantio direto 653 $aTerras altas 653 $aZero tillage 700 1 $aCASTRO, E. da M. de
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