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| Acesso ao texto completo restrito à biblioteca da Embrapa Agrossilvipastoril. Para informações adicionais entre em contato com cpamt.biblioteca@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Agrossilvipastoril. |
Data corrente: |
07/11/2018 |
Data da última atualização: |
07/11/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
OLIVEIRA JUNIOR, J. C.; FURQUIM, S. A. C.; NASCIMENTO, A. F. do; BEIRIGO, R. M.; BARBIERO, L.; VALLES, V.; COUTO, E. G.; VIDAL-TORRADO, P. |
Afiliação: |
JAIRO C. OLIVEIRA JUNIOR, UFPR; SHEILA A. C. FURQUIM, UNIFESP, DIADEMA; ALEXANDRE FERREIRA DO NASCIMENTO, CPAMT; RAPHAEL M. BEIRIGO, UFPB, AREIA; LAURENT BARBIERO, GÉOSCIENCE ENVIRONNEMENT TOULOUSE, FRANCE; VINCENT VALLES, UNIVERSITÉ D'AVIGNON ET DES PAYS DU VAUCLUSE, AVIGNON; EDUARDO G. COUTO, UFMT, CUIABA; PABLO VIDAL-TORRADO, USP-ESALQ, PIRACICABA. |
Título: |
Salt-affected soils on elevated landforms of an alluvial megafan, northern Pantanal, Brazil. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Catena, v. 172, p. 819-830, 2019. |
ISSN: |
0341-8162 |
DOI: |
https://doi.org/10.1016/j.catena.2018.09.041 |
Idioma: |
Inglês |
Conteúdo: |
Salt-affected soils play an important role in the Pantanal wetlands ecosystem, in Brazil, but their occurrence on higher landforms is not well understood. In order to investigate the major processes involved in salt-affected soil formation, a trench was opened in a representative transition between the floodplain and a paleochannel-paleolevee complex not currently reached by floodwater. The trench was 6 meter long and 2 meter deep, and 121 soil samples were collected in a 0.25×0.25m regular grid and submitted for soil (particle-size, pH, exchangeable cations) and solution extract (major cation and anions) analyses. Analytical results were subjected to geostatistical and principal components analyses (PCA). For selected horizons, an undisturbed sample was collected to perform thin sections and micromorphology description. The presence of degraded carbonates in the soils indicated an ancient formation. The regional environmental settings of the alluvial fan and particle size variation along the soil profiles suggested that the sediments of the study site were deposited during the Late Pleistocene and Holocene, in a river channel-levee complex and an abandoned channel by avulsion processes. The depressed topography of the abandoned channel, accompanied by moderately drier climates during early Holocene, likely favored low leaching of salts and higher evapotranspiration, enabling the development of saltaffected soils. Later erosion of the region, which is expected in older lobes of alluvial fans, triggered a relief inversion in the area, preserving the more clayey areas as a slightly higher landform with remaining salt-affected soils. Currently, the seasonal flooding mainly reaches the footslope of this landform, triggering redoximorphic processes, expressed as redox concentrations and depletions, and solodization processes, expressed by lower values of pH, cation exchange capacity (CEC), base saturation and exchangeable sodium percentage (ESP) than at the summit. Thus, the occurrence of salt-affected soils on higher landforms is the reflection of a complex sedimentological history. In this way, the genesis of salt-affected soils on higher landforms, which seems to be poorly understood in many situations worldwide, should be carefully investigated in order to address formation mechanisms, especially in extremely dynamic environments of tropical wetlands. MenosSalt-affected soils play an important role in the Pantanal wetlands ecosystem, in Brazil, but their occurrence on higher landforms is not well understood. In order to investigate the major processes involved in salt-affected soil formation, a trench was opened in a representative transition between the floodplain and a paleochannel-paleolevee complex not currently reached by floodwater. The trench was 6 meter long and 2 meter deep, and 121 soil samples were collected in a 0.25×0.25m regular grid and submitted for soil (particle-size, pH, exchangeable cations) and solution extract (major cation and anions) analyses. Analytical results were subjected to geostatistical and principal components analyses (PCA). For selected horizons, an undisturbed sample was collected to perform thin sections and micromorphology description. The presence of degraded carbonates in the soils indicated an ancient formation. The regional environmental settings of the alluvial fan and particle size variation along the soil profiles suggested that the sediments of the study site were deposited during the Late Pleistocene and Holocene, in a river channel-levee complex and an abandoned channel by avulsion processes. The depressed topography of the abandoned channel, accompanied by moderately drier climates during early Holocene, likely favored low leaching of salts and higher evapotranspiration, enabling the development of saltaffected soils. Later erosion of the region, which is expected in older lobes... Mostrar Tudo |
Palavras-Chave: |
Evaporative concentration of Waters; Quaternary climatic changes; Relict soil carbonates; Solodization; Tropical wetlands. |
Thesaurus Nal: |
Sodic soils. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03313naa a2200301 a 4500 001 2098909 005 2018-11-07 008 2019 bl uuuu u00u1 u #d 022 $a0341-8162 024 7 $ahttps://doi.org/10.1016/j.catena.2018.09.041$2DOI 100 1 $aOLIVEIRA JUNIOR, J. C. 245 $aSalt-affected soils on elevated landforms of an alluvial megafan, northern Pantanal, Brazil.$h[electronic resource] 260 $c2019 520 $aSalt-affected soils play an important role in the Pantanal wetlands ecosystem, in Brazil, but their occurrence on higher landforms is not well understood. In order to investigate the major processes involved in salt-affected soil formation, a trench was opened in a representative transition between the floodplain and a paleochannel-paleolevee complex not currently reached by floodwater. The trench was 6 meter long and 2 meter deep, and 121 soil samples were collected in a 0.25×0.25m regular grid and submitted for soil (particle-size, pH, exchangeable cations) and solution extract (major cation and anions) analyses. Analytical results were subjected to geostatistical and principal components analyses (PCA). For selected horizons, an undisturbed sample was collected to perform thin sections and micromorphology description. The presence of degraded carbonates in the soils indicated an ancient formation. The regional environmental settings of the alluvial fan and particle size variation along the soil profiles suggested that the sediments of the study site were deposited during the Late Pleistocene and Holocene, in a river channel-levee complex and an abandoned channel by avulsion processes. The depressed topography of the abandoned channel, accompanied by moderately drier climates during early Holocene, likely favored low leaching of salts and higher evapotranspiration, enabling the development of saltaffected soils. Later erosion of the region, which is expected in older lobes of alluvial fans, triggered a relief inversion in the area, preserving the more clayey areas as a slightly higher landform with remaining salt-affected soils. Currently, the seasonal flooding mainly reaches the footslope of this landform, triggering redoximorphic processes, expressed as redox concentrations and depletions, and solodization processes, expressed by lower values of pH, cation exchange capacity (CEC), base saturation and exchangeable sodium percentage (ESP) than at the summit. Thus, the occurrence of salt-affected soils on higher landforms is the reflection of a complex sedimentological history. In this way, the genesis of salt-affected soils on higher landforms, which seems to be poorly understood in many situations worldwide, should be carefully investigated in order to address formation mechanisms, especially in extremely dynamic environments of tropical wetlands. 650 $aSodic soils 653 $aEvaporative concentration of Waters 653 $aQuaternary climatic changes 653 $aRelict soil carbonates 653 $aSolodization 653 $aTropical wetlands 700 1 $aFURQUIM, S. A. C. 700 1 $aNASCIMENTO, A. F. do 700 1 $aBEIRIGO, R. M. 700 1 $aBARBIERO, L. 700 1 $aVALLES, V. 700 1 $aCOUTO, E. G. 700 1 $aVIDAL-TORRADO, P. 773 $tCatena$gv. 172, p. 819-830, 2019.
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Embrapa Agrossilvipastoril (CPAMT) |
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Registro Completo
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
08/04/2011 |
Data da última atualização: |
08/04/2011 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
PINTO, T. L. F.; CICERO, S. M.; FRANCA NETO, J. B.; FORTI, V. A.; DOURADO-NETO, D. |
Afiliação: |
TAÍS LEITE FERREIRA PINTO, USP; SILVIO MOURE CICERO; JOSE DE BARROS FRANCA NETO, CNPSO; VICTOR AUGUSTO FORTI; DURVAL DOURADO NETO. |
Título: |
Asiatic rust disease and its effects on soybean yield and seed quality. |
Ano de publicação: |
2010 |
Fonte/Imprenta: |
In: ISTA CONGRESS - SEED SYMPOSIUM, 29., Cologne, 2010. Abstracts... Bassersdorf: ISTA, 2010. p. 28. Abst. 5. |
Idioma: |
Português |
Palavras-Chave: |
Ferrugem asiática da soja. |
Thesagro: |
Doença de planta; Ferrugem; Qualidade; Semente; Soja. |
Thesaurus NAL: |
Plant diseases and disorders; Rust diseases; Seed quality; Soybeans. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
Marc: |
LEADER 00818naa a2200277 a 4500 001 1885408 005 2011-04-08 008 2010 bl uuuu u00u1 u #d 100 1 $aPINTO, T. L. F. 245 $aAsiatic rust disease and its effects on soybean yield and seed quality. 260 $c2010 650 $aPlant diseases and disorders 650 $aRust diseases 650 $aSeed quality 650 $aSoybeans 650 $aDoença de planta 650 $aFerrugem 650 $aQualidade 650 $aSemente 650 $aSoja 653 $aFerrugem asiática da soja 700 1 $aCICERO, S. M. 700 1 $aFRANCA NETO, J. B. 700 1 $aFORTI, V. A. 700 1 $aDOURADO-NETO, D. 773 $tIn: ISTA CONGRESS - SEED SYMPOSIUM, 29., Cologne, 2010. Abstracts... Bassersdorf: ISTA, 2010. p. 28. Abst. 5.
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