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| Registros recuperados : 62 | |
| 32. |  | SILVA, P. de S.; FIGUEIREDO, R. de O.; CUNHA, E. da S.; SCHULER, M.; MARKEWITZ, D.; DAVIDSON, E. A. Influência do uso da terra sobre a qualidade das águas de quatro igarapés na Amazônia Oriental: variabilidade espacial e sazonal de pH, condutividade elétrica, oxigênio dissolvido, temperatura, e turbidez. In: CONGRESSO DE ESTUDANTES E BOLSISTAS DO EXPERIMENTO LBA, 2., 2005, Manaus. Resumos... [S.l.]: LBA, [2005?]. p. 45.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 33. | | RANGEL-VASCONCELOS, L. G. T.; FIGUEIREDO, R. de O.; SCHULER, M. A. E.; MARKEWITZ, D.; DAVIDSON, E. A. Integration of biogeochemical and hydrological data in pasture and forest covered catchments in Eastern Amazonia. In: SCIENCE TEAM MEETING, 10., 2006, Brasília, DF. Book of Abstracts... Manaus: LBA-ECO, 2006. p. 49.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 34. | | CARVALHO, C. J. R. de; DAVIDSON, E. A.; SANTOS, T. P. dos; DUTRA, F. C.; SERRÃO, B. de O. Changing enzymatic activities and mycorrhizal infections in a chronosequence of secondary and mature forests of eastern Amazonia. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 23.1.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 35. | | MARKEWITZ, D.; FIGUEIREDO, R. de O.; DAVIDSON, E. A.; BUSTAMANTE, M. M. C.; PARRON, L.; RESENDE, J. The chemistry of two streams draining kaolinitic soils. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Plenária 6. Resumo 20.5.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 36. | | MARKEWITZ, D.; RESENDE, J. C. F.; PARRON, L.; BUSTAMANTE, M.; KLINK, C. A.; FIGUEIREDO, R. de O.; DAVIDSON, E. A. Dissolved rainfall inputs and streamwater outputs in an undisturbed watershed on highly weathered soils in the brazilian cerrado. Hydrological Processes, v. 20, n. 12, p. 2615-2639, Aug. 2006.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 38. | | FREITAS, J. F. B. de; SÁ, T. D. de A.; ISHIDA, F. Y.; SABÁ, R. T.; DAVIDSON, E. A.; FIGUEIREDO, R. de O. Alterações nas emissões de gases traço em função da substituição do sistema de produção agrícola de corte/queima pelo de corte/trituração/manejo de capoeira. In: SEMINÁRIO DE INICIAÇÃO CIENTÍFICA DA FCAP, 12.; SEMINÁRIO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA AMAZÔNIA ORIENTAL, 6., 2002, Belém, PA. A contribuição do profissional de Ciências Agrárias no uso e conservação da biodiversidade: anais. Belém, PA: FCAP: Embrapa Amazônia Oriental, 2002.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 39. | | CARVALHO, C. J. R. de; DAVIDSON, E. A.; SANTOS, T. P. dos; FIGUEIREDO, R. de O.; SERRÃO, B. de O.; DUTRA, F. C. Atividade da fosfatase ácida, uréase e micorrizas em uma área de vegetação secundária de Paragominas, Estado do Pará, dois anos após adubação com nitrogênio e fósforo. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Plenária 6. Resumo. Resumo 28.9-P.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 40. | | SIDDIQUE, I.; VIEIRA, I. C. G.; SCHIMIDT, S.; LAMB, D.; CARVALHO, C. J. R. de; FIGUEIREDO, R. de O.; BLOMBERG, S.; DAVIDSON, E. A. Nitrogen and phosphorus additions negatively affect tree species diversity tropical forest regrowth trajectories. Ecology, v. 91, n. 7, p. 2121-2131, 2010.| Biblioteca(s): Embrapa Amazônia Oriental. |
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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. |
Registro Completo
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
31/01/2008 |
|
Data da última atualização: |
23/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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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 |
|
Idioma: |
Inglês |
|
Notas: |
WR 005493. |
|
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 |
|
Palavras-Chave: |
Brasil. |
|
Thesagro: |
Água do Solo; Floresta Tropical. |
|
Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
-- |
|
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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