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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
31/01/2008 |
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Data da última atualização: |
23/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BELK, E. L.; MARKEWITZ, D.; RASMUSSEN, T. C.; CARVALHO, E. J. M.; NEPSTAD, D. C.; DAVIDSON, E. A. |
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Afiliação: |
Elisabeth L. Belk, University of Georgia; Daniel Markewitz, University of Georgia; Todd C. Rasmussen, University of Georgia; EDUARDO JORGE MAKLOUF CARVALHO, CPATU; Daniel C. Nepstad, Woods Hole Research Center; Eric A. Davidson, Woods Hole Research Center. |
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Título: |
Modeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Water Resources Research, v. 43, n. 8, Aug. 2007. |
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DOI: |
10.1029/2006WR005493 |
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Idioma: |
Inglês |
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Notas: |
WR 005493. |
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Conteúdo: |
Access to water reserves in deep soil during drought periods determines whether or not the tropical moist forests of Amazonia will be buffered from the deleterious effects of water deficits. Changing climatic conditions are predicted to increase periods of drought in Amazonian forests and may lead to increased tree mortality, changes in forest composition, or greater susceptibility to fire. A throughfall reduction experiment has been established in the Tapajós National Forest of east-central Amazonia (Brazil) to test the potential effects of severe water stress during prolonged droughts. Using time domain reflectometry observations of water contents from this experiment, we have developed a dynamic, one-dimensional, vertical flow model to enhance our understanding of hydrologic processes within these tall-stature forests on well-drained, upland, deep Oxisols and to simulate changes in the distribution of soil water. Simulations using 960 days of data accurately captured mild soil water depletion near the surface after the first treatment year and decreasing soil moisture at depth during the second treatment year. The model is sensitive to the water retention and unsaturated flow equation parameters, specifically the van Genuchten parameters ?s, ?r, and n, but less sensitive to Ks and ?. The low root-mean-square error between observed and predicted volumetric soil water content suggests that this vertical flow model captures the most important hydrologic processes in the upper landscape position of this study site. The model indicates that present rates of evapotranspiration within the exclusion plot have been sustained at the expense of soil water storage. MenosAccess to water reserves in deep soil during drought periods determines whether or not the tropical moist forests of Amazonia will be buffered from the deleterious effects of water deficits. Changing climatic conditions are predicted to increase periods of drought in Amazonian forests and may lead to increased tree mortality, changes in forest composition, or greater susceptibility to fire. A throughfall reduction experiment has been established in the Tapajós National Forest of east-central Amazonia (Brazil) to test the potential effects of severe water stress during prolonged droughts. Using time domain reflectometry observations of water contents from this experiment, we have developed a dynamic, one-dimensional, vertical flow model to enhance our understanding of hydrologic processes within these tall-stature forests on well-drained, upland, deep Oxisols and to simulate changes in the distribution of soil water. Simulations using 960 days of data accurately captured mild soil water depletion near the surface after the first treatment year and decreasing soil moisture at depth during the second treatment year. The model is sensitive to the water retention and unsaturated flow equation parameters, specifically the van Genuchten parameters ?s, ?r, and n, but less sensitive to Ks and ?. The low root-mean-square error between observed and predicted volumetric soil water content suggests that this vertical flow model captures the most important hydrologic processes in the uppe... Mostrar Tudo |
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Palavras-Chave: |
Brasil. |
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Thesagro: |
Água do Solo; Floresta Tropical. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02441naa a2200253 a 4500
001 1409196
005 2022-11-23
008 2007 bl uuuu u00u1 u #d
024 7 $a10.1029/2006WR005493$2DOI
100 1 $aBELK, E. L.
245 $aModeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest.$h[electronic resource]
260 $c2007
500 $aWR 005493.
520 $aAccess to water reserves in deep soil during drought periods determines whether or not the tropical moist forests of Amazonia will be buffered from the deleterious effects of water deficits. Changing climatic conditions are predicted to increase periods of drought in Amazonian forests and may lead to increased tree mortality, changes in forest composition, or greater susceptibility to fire. A throughfall reduction experiment has been established in the Tapajós National Forest of east-central Amazonia (Brazil) to test the potential effects of severe water stress during prolonged droughts. Using time domain reflectometry observations of water contents from this experiment, we have developed a dynamic, one-dimensional, vertical flow model to enhance our understanding of hydrologic processes within these tall-stature forests on well-drained, upland, deep Oxisols and to simulate changes in the distribution of soil water. Simulations using 960 days of data accurately captured mild soil water depletion near the surface after the first treatment year and decreasing soil moisture at depth during the second treatment year. The model is sensitive to the water retention and unsaturated flow equation parameters, specifically the van Genuchten parameters ?s, ?r, and n, but less sensitive to Ks and ?. The low root-mean-square error between observed and predicted volumetric soil water content suggests that this vertical flow model captures the most important hydrologic processes in the upper landscape position of this study site. The model indicates that present rates of evapotranspiration within the exclusion plot have been sustained at the expense of soil water storage.
650 $aAmazonia
650 $aÁgua do Solo
650 $aFloresta Tropical
653 $aBrasil
700 1 $aMARKEWITZ, D.
700 1 $aRASMUSSEN, T. C.
700 1 $aCARVALHO, E. J. M.
700 1 $aNEPSTAD, D. C.
700 1 $aDAVIDSON, E. A.
773 $tWater Resources Research$gv. 43, n. 8, Aug. 2007.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Agropecuária Oeste; Embrapa Soja. |
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Data corrente: |
21/12/2012 |
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Data da última atualização: |
20/07/2017 |
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Tipo da produção científica: |
Folder/Folheto/Cartilha |
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Autoria: |
CARNEIRO, G. E. de S.; PIPOLO, A. E.; MELO, C. L. P. de; MIRANDA, L. C.; PETEK, M. R.; LIMA, D. de; GOMIDE, F. B.; DALBOSCO, M.; DENGLER, R. U. |
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Afiliação: |
GERALDO ESTEVAM DE SOUZA CARNEIRO, CNPSO; ANTONIO EDUARDO PIPOLO, CNPSO; CARLOS LASARO PEREIRA DE MELO, CPAO; LUIZ CARLOS MIRANDA, SPM E Londrina; MARCOS RAFAEL PETEK, SPM E Londrina; DIVANIA DE LIMA, CNPSO; FERNANDO BERNARDO GOMIDE, Fundação Meridional; MILTON DALBOSCO, Fundação Meridional; RALF UDO DENGLER, Fundação Meridional. |
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Título: |
BRS 359RR: soja precoce para semeadura antecipada! |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Londrina: Embrapa Soja, 2012. |
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Idioma: |
Português |
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Notas: |
1 folder. |
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Conteúdo: |
A BRS 359RR é a soja transgênica precoce, que aliada à semeadura antecipada, favorece a safrinha de milho na melhor época. Possui crescimento indeterminado e alto potencial produtivo, inclusive com bom desempenho em áreas com altitudes acima de 600 metros. Grupo de maturidade relativa. Região edafoclimática de adaptação. Época de semeadura. Reação a doenças. Densidade de semeadura. Características. |
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Palavras-Chave: |
Transgênicos. |
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Thesagro: |
Planta transgênica; Rendimento; Soja; Variedade. |
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Thesaurus NAL: |
Soybeans; Transgenic plants. |
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Categoria do assunto: |
--
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/72777/1/Folder-lancamento-BRS-359RR.pdf
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Marc: |
LEADER 01171nam a2200301 a 4500
001 1943452
005 2017-07-20
008 2012 bl uuuu u0uu1 u #d
100 1 $aCARNEIRO, G. E. de S.
245 $aBRS 359RR$bsoja precoce para semeadura antecipada!
260 $aLondrina: Embrapa Soja$c2012
500 $a1 folder.
520 $aA BRS 359RR é a soja transgênica precoce, que aliada à semeadura antecipada, favorece a safrinha de milho na melhor época. Possui crescimento indeterminado e alto potencial produtivo, inclusive com bom desempenho em áreas com altitudes acima de 600 metros. Grupo de maturidade relativa. Região edafoclimática de adaptação. Época de semeadura. Reação a doenças. Densidade de semeadura. Características.
650 $aSoybeans
650 $aTransgenic plants
650 $aPlanta transgênica
650 $aRendimento
650 $aSoja
650 $aVariedade
653 $aTransgênicos
700 1 $aPIPOLO, A. E.
700 1 $aMELO, C. L. P. de
700 1 $aMIRANDA, L. C.
700 1 $aPETEK, M. R.
700 1 $aLIMA, D. de
700 1 $aGOMIDE, F. B.
700 1 $aDALBOSCO, M.
700 1 $aDENGLER, R. U.
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Embrapa Soja (CNPSO) |
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