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Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
29/01/1996 |
Data da última atualização: |
04/04/2017 |
Autoria: |
VICTORIA, R. L.; FERNANDES, F. A.; MARTINELLI, L. A.; PICCOLO, M. de C.; CAMARGO, P. B. de; TRUMBORE, S. |
Afiliação: |
Centro de Energia Nuclear na Agricultura (Piracicaba, SP); EMBRAPA. Centro de Pesquisa Agropecuaria do Pantanal (Corumba, MS); University of California at Irvine. Department of Earth System Science (Irvine,CA). |
Título: |
Past vegetation changes in the Brazilian Pantanal arboreal-grassy savanna ecotone by using carbon isotopes in the soil organic matter. |
Ano de publicação: |
1995 |
Fonte/Imprenta: |
Global Change Biology, v.1, p.165-171, 1995. |
Idioma: |
Inglês |
Conteúdo: |
Measurements of the organic carbon inventory, its stable isotopic composition and radiocarbon content were used to deduce vegetation history from two soil profiles in arboreal and grassy savanna ecotones in Brazilian Pantanal. The Pantanal is a large floodplain area with grass-dominated lowlands subject to seasonal flooding, and arboreal savanna uplands which are only rarely flooded. Organic carbon inventories were lower in the grassy savanna site than in the upland arboreal savanna site, with carbon decreasing exponentially with depth from the surface in both profiles. Changes in 13C of soil organic matter (SOM) with depth differed markedly between the two sites. Differences in surface SOM 13C values reflect the change from C3 to C4 plants between the sites, as confirmed by measurements of 13C of vegetation and the soil surface along a transect between the upland closed-canopy forest and lowland grassy savanna. Changes of 13C in SOM with depth at both sites are larger than 3-4 per mil increases expected from fractionation associated with organic matter decomposition. We interpret these as recording past changes in the relative abundance of C3 and C4 plants at these sites. Mass balances with 14C and 13C suggest that past vegetational changes from C3 to C4 plants in the grassy savanna, and in the deeper part of the arboreal savanna, occurred between 4600 and 11400 BP, when major climatic changes were also observed in several places of the South American Continent. The change from C4 to C3, observed only in the ... MenosMeasurements of the organic carbon inventory, its stable isotopic composition and radiocarbon content were used to deduce vegetation history from two soil profiles in arboreal and grassy savanna ecotones in Brazilian Pantanal. The Pantanal is a large floodplain area with grass-dominated lowlands subject to seasonal flooding, and arboreal savanna uplands which are only rarely flooded. Organic carbon inventories were lower in the grassy savanna site than in the upland arboreal savanna site, with carbon decreasing exponentially with depth from the surface in both profiles. Changes in 13C of soil organic matter (SOM) with depth differed markedly between the two sites. Differences in surface SOM 13C values reflect the change from C3 to C4 plants between the sites, as confirmed by measurements of 13C of vegetation and the soil surface along a transect between the upland closed-canopy forest and lowland grassy savanna. Changes of 13C in SOM with depth at both sites are larger than 3-4 per mil increases expected from fractionation associated with organic matter decomposition. We interpret these as recording past changes in the relative abundance of C3 and C4 plants at these sites. Mass balances with 14C and 13C suggest that past vegetational changes from C3 to C4 plants in the grassy savanna, and in the deeper part of the arboreal savanna, occurred between 4600 and 11400 BP, when major climatic changes were also observed in several places of the South American Continent. The change ... Mostrar Tudo |
Palavras-Chave: |
Area umida; Carbono solido; Isotope; Mudanca de vegetacao; Radiocarbon; Radiocarbono; Savana; Savanna; Stable carbon; Stable carbon isotope; Vegetation change; Wetland. |
Thesagro: |
Isótopo; Matéria Orgânica; Solo Úmido; Vegetação. |
Thesaurus Nal: |
Brazil; Pantanal; soil organic matter. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02655naa a2200409 a 4500 001 1787002 005 2017-04-04 008 1995 bl --- 0-- u #d 100 1 $aVICTORIA, R. L. 245 $aPast vegetation changes in the Brazilian Pantanal arboreal-grassy savanna ecotone by using carbon isotopes in the soil organic matter. 260 $c1995 520 $aMeasurements of the organic carbon inventory, its stable isotopic composition and radiocarbon content were used to deduce vegetation history from two soil profiles in arboreal and grassy savanna ecotones in Brazilian Pantanal. The Pantanal is a large floodplain area with grass-dominated lowlands subject to seasonal flooding, and arboreal savanna uplands which are only rarely flooded. Organic carbon inventories were lower in the grassy savanna site than in the upland arboreal savanna site, with carbon decreasing exponentially with depth from the surface in both profiles. Changes in 13C of soil organic matter (SOM) with depth differed markedly between the two sites. Differences in surface SOM 13C values reflect the change from C3 to C4 plants between the sites, as confirmed by measurements of 13C of vegetation and the soil surface along a transect between the upland closed-canopy forest and lowland grassy savanna. Changes of 13C in SOM with depth at both sites are larger than 3-4 per mil increases expected from fractionation associated with organic matter decomposition. We interpret these as recording past changes in the relative abundance of C3 and C4 plants at these sites. Mass balances with 14C and 13C suggest that past vegetational changes from C3 to C4 plants in the grassy savanna, and in the deeper part of the arboreal savanna, occurred between 4600 and 11400 BP, when major climatic changes were also observed in several places of the South American Continent. The change from C4 to C3, observed only in the ... 650 $aBrazil 650 $aPantanal 650 $asoil organic matter 650 $aIsótopo 650 $aMatéria Orgânica 650 $aSolo Úmido 650 $aVegetação 653 $aArea umida 653 $aCarbono solido 653 $aIsotope 653 $aMudanca de vegetacao 653 $aRadiocarbon 653 $aRadiocarbono 653 $aSavana 653 $aSavanna 653 $aStable carbon 653 $aStable carbon isotope 653 $aVegetation change 653 $aWetland 700 1 $aFERNANDES, F. A. 700 1 $aMARTINELLI, L. A. 700 1 $aPICCOLO, M. de C. 700 1 $aCAMARGO, P. B. de 700 1 $aTRUMBORE, S. 773 $tGlobal Change Biology$gv.1, p.165-171, 1995.
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Embrapa Pantanal (CPAP) |
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5. | | SOARES, L. H. de B.; FERNANDES, V. H.; FACHIM, D. L.; REIS, V. M. Tecnologia de bioprocessos ao desenvolvimento de inoculantes e novos insumos biológicos. In: REUNIÃO DA REDE DE LABORATÓRIOS PARA RECOMENDAÇÃO, PADRONIZAÇÃO E DIFUSÃO DE TECNOLOGIA DE INOCULANTES MICROBIOLÓGICOS DE INTERESSE AGRÍCOLA, 15., 2010, Curitiba. Anais... Brasília, DF: Embrapa, 2012. 77 p. Organizado por: Fábio Martins Mercante e Oscar Fontão de Lima Filho. RELARE.Tipo: Resumo em Anais de Congresso |
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