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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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| Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Gado de Corte. |
Data corrente: |
27/02/2018 |
Data da última atualização: |
27/02/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
C - 0 |
Autoria: |
HERNÀNDEZ-GARAY, A.; EUCLIDES, V. P. B.; SILVA, S. C. da; MONTAGNER, D. B.; NANTES, N. N.; NASCIMENTO JUNIOR, D. do; SOARES, C. O. |
Afiliação: |
A. HERNÁNDEZ-GARAY, Colegio de Postgraduados, Mexico; VALERIA PACHECO BATISTA EUCLIDES, CNPGC; SILA CARNEIRO da SILVA, Universidade de São Paulo, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), Piracicaba; DENISE BAPTAGLIN MONTAGNER, Universidade Federal da Grande Dourados; NAYANA NAZARETH NANTES, Universidade Federal de Mato Grosso do Sul; DOMÍCIO DO NASCIMENTO JUNIOR, Universidade Federal de Viçosa - MG; CLEBER OLIVEIRA SOARES, CNPGC. |
Título: |
Herbage accumulation and animal performance on Xaraés palisade grass subjected to intensities of continuous stocking management. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Tropical Grasslands - Forrajes Tropicales, v. 2, p. 76-78, 2014. |
Idioma: |
Inglês |
Conteúdo: |
Most grass species used in Brazil belong to the genera Brachiaria and Panicum, with Marandu palisade grass (Brachiaria brizantha cv. Marandu) being the main cultivated forage grass (Santos Filho 1996). B. brizantha cv. Xaraés was released as an option for diversifying forage species; it has high herbage yield and fast re-growth, favoring high stocking rates and animal productivity (Euclides et al. 2008; 2009). The objective of this study was to evaluate herbage accumulation and animal performance of beef steers grazing continuously stocked Xaraés palisade grass managed at 15, 30 and 45 cm sward height. |
Palavras-Chave: |
Herbage. |
Thesagro: |
Brachiaria brizantha; Gramínea forrageira. |
Thesaurus NAL: |
Forage grasses; Grazing management; Liveweight gain. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01455naa a2200265 a 4500 001 2088228 005 2018-02-27 008 2014 bl uuuu u00u1 u #d 100 1 $aHERNÀNDEZ-GARAY, A. 245 $aHerbage accumulation and animal performance on Xaraés palisade grass subjected to intensities of continuous stocking management.$h[electronic resource] 260 $c2014 520 $aMost grass species used in Brazil belong to the genera Brachiaria and Panicum, with Marandu palisade grass (Brachiaria brizantha cv. Marandu) being the main cultivated forage grass (Santos Filho 1996). B. brizantha cv. Xaraés was released as an option for diversifying forage species; it has high herbage yield and fast re-growth, favoring high stocking rates and animal productivity (Euclides et al. 2008; 2009). The objective of this study was to evaluate herbage accumulation and animal performance of beef steers grazing continuously stocked Xaraés palisade grass managed at 15, 30 and 45 cm sward height. 650 $aForage grasses 650 $aGrazing management 650 $aLiveweight gain 650 $aBrachiaria brizantha 650 $aGramínea forrageira 653 $aHerbage 700 1 $aEUCLIDES, V. P. B. 700 1 $aSILVA, S. C. da 700 1 $aMONTAGNER, D. B. 700 1 $aNANTES, N. N. 700 1 $aNASCIMENTO JUNIOR, D. do 700 1 $aSOARES, C. O. 773 $tTropical Grasslands - Forrajes Tropicales$gv. 2, p. 76-78, 2014.
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