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| Registros recuperados : 46 | |
| 22. |  | MARKEWITZ, D.; FIGUEIREDO, R. D.; MELAC, J. M.; NOVO, E.; RICHEY, J. E.; RICHEY, J. River corridors of the Amazon Basin and their response to Anthropogenic Change: A look back and a glimpse forward. In: MEETING OF THE AMERICAN, 2010, Foz do Iguaçu. Meeting of the Americas Abstracts... Washington, US: American Geophysical Union, 2010. Não paginado. U41B-04.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 27. | | 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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| 29. | | 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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| 30. | | JOSLIN, A. H.; MARKEWITZ, D.; MORRIS, L. A.; OLIVEIRA, F. de A.; FIGUEIREDO, R. de O.; KATO, O. R. Five native tree species and manioc under slash-and-mulch agroforestry in the eastern Amazon of Brazil: plant growth and soil responses. Agroforestry Systems, v. 81, n. 1, p. 1-14, 2011.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 31. | | ROSA, M. B. S. da; FIGUEIREDO, R. de O.; MARKEWITZ, D.; KRUSCHE, A. V.; COSTA, F. F.; GERHARD, P. Evasion of CO2 and dissolved carbon in river waters of three small catchments in an area occupied by small family farms in the eastern Amazon. Ambiente e Água , Taubaté, v. 12, n. 4, p. 556-574, 2017.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 32. | | 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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| 33. | | 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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| 35. | | JOSLIN, A. H.; MARKEWITZ, D.; MORRIS, L. A.; OLIVEIRA, F. de A.; FIGUEIREDO, R. O.; KATO, O. R. Soil and plant N-budget 1 year after planting of a slash-and-mulch agroforestry system in the eastern Amazon of Brazil. Agroforestry Systems, v. 87, n. 6, p. 1339-1349, Dec. 2013.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 36. | | MARKEWITZ, D.; LAMON, E. C.; BUSTAMANTE, M. C.; CHAVES, J.; FIGUEIREDO, R. O.; JOHNSON, M. S.; KRUSCHE, A.; NEILL, C.; SILVA, J. S. O. Discharge-calcium concentration relationships in streams of the Amazon and Cerrado of Brazil: soil or land use controlled. Biogeochemistry, Dordrecht, v. 105, n. 1-3, p. 19-35, Sep. 2011.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 37. | | MARKEWITZ, D.; LAMON III, E. C.; BUSTAMANTE, M. M. C.; CHAVES, J.; FIGUEIREDO, R. de O.; JOHNSON, M. S.; KRUSCHE, A. V.; NEILL, C.; SILVA, J. S. O. Discharge calcium concentration relationships in streams of the Amazon and Cerrado of Brazil: soil or land use controlled. In: ESA ANNUAL MEETING, 96., 2011, Austin. Nº COS 97-6.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 38. | | CHAVES, J.; NEILL, C.; MARKEWITZ, D.; ELSENBEER, H.; KRUSCHE, A. V.; BIGGS, T.; FIGUEIREDO, R. de O.; LEHMAN, J.; DEEGAN, L. A. Identifying runoff sources across scales in Amazon watersheds: an LBA synthesis effort. In: SCIENCE TEAM MEETING, 11., 2007, Salvador. Book of Abstracts... Manaus: LBA-ECO, 2007. Abstract ID: 54.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 39. | | SCHULER, M. A. E.; MORAES, J. M. de; DUNNE, T.; FIGUEIREDO, R. de O.; MARKEWITZ, D.; DAVIDSON, E. A.; VICTORIA, R. L. Hydrological processes in small forest and pasture catchments of the eastern amazônia. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Plenária 6. Resumo 20.2.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 40. | | PACHECO JÚNIOR, A. C.; SILVA, P. S.; FIGUEIREDO, R. de O.; CUNHA, E. da S.; SCHULER, M.; MARKEWITZ, D.; DAVIDSON, E. A. Estudo estatístico preliminar de parâmetros físico-químicos e biogeoquímicos das águas do Igarapé 54 em Paragominas/PA - Amazônia Oriental. In: CONGRESSO DE ESTUDANTES E BOLSISTAS DO EXPERIMENTO LBA, 2., 2005, Manaus. Resumos... [S.l.]: LBA, [2005?]. p. 85.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 46 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Solos. |
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Data corrente: |
24/01/2011 |
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Data da última atualização: |
13/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
FIGUEIREDO, R. de O.; MARKEWITZ, D.; DAVIDSON, E. A.; SCHULER, A. E.; WATRIN, O. dos S.; SILVA, P. de S. |
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Afiliação: |
RICARDO DE OLIVEIRA FIGUEIREDO, CPATU; DANIEL MARKEWITZ, University of Georgia; ERIC A. DAVIDSON, Woods Hole Research Center; AZENETH EUFRAUSINO SCHULER, CNPS; ORLANDO DOS SANTOS WATRIN, CPATU; PATRÍCIO DE SOUZA SILVA, CNPS. |
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Título: |
Land-use effects on the chemical attributes of low-order streams in the eastern Amazon. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Journal of Geophysical Research, v. 115, G04004, Dec. 2010. |
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DOI: |
https://doi.org/10.1029/2009JG001200 |
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Idioma: |
Inglês |
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Conteúdo: |
Deforestation is altering small catchment hydrobiogeochemistry in the Amazon. To evaluate land use change effects on water chemistry and other measures of water quality, five low-order streams were studied in the eastern Amazon from April 2003 to October 2005. It was hypothesized that 1) cation loads would increase downstream as the area of cleared forest increased, particularly during the wet season, 2) increasing forest to pasture conversion would increase total solute loads, and 3) nitrate concentrations, which are high under mature forest, would decline with conversion to pasture, but would increase with increasing row crop agriculture. The first hypothesis was generally not supported, as there was no consistent observed increase in conductivity or cation concentrations from upstream to downstream. However, elevated wet-season measures of conductivity, alkalinity, and turbidity indicated increased wet season surface runoff of these constituents, with seasonal changes largest in the watersheds that had experienced the most deforestation. The second hypothesis was supported when all data were pooled in a mixed-model analysis such that conductivity declined with increasing percent forest or increased with increasing percent pasture; however, similar correlations with cations were not significant. The third hypothesis was supported, with decreasing nitrate concentrations observed as forest cover declined and pasture cover increased from upstream to downstream positions, except where crops were grown near the stream, which was associated with increased stream nitrate. In addition, stream temperature, dissolved oxygen, and pH were negatively correlated with percent forest cover while sodium, chloride, and turbidity also increased with percent crop cover. Turbidity, temperature, pH, and dissolved oxygen appear to be the simplest and most indicative parameters for detecting effects of land-use change on water quality in this region. MenosDeforestation is altering small catchment hydrobiogeochemistry in the Amazon. To evaluate land use change effects on water chemistry and other measures of water quality, five low-order streams were studied in the eastern Amazon from April 2003 to October 2005. It was hypothesized that 1) cation loads would increase downstream as the area of cleared forest increased, particularly during the wet season, 2) increasing forest to pasture conversion would increase total solute loads, and 3) nitrate concentrations, which are high under mature forest, would decline with conversion to pasture, but would increase with increasing row crop agriculture. The first hypothesis was generally not supported, as there was no consistent observed increase in conductivity or cation concentrations from upstream to downstream. However, elevated wet-season measures of conductivity, alkalinity, and turbidity indicated increased wet season surface runoff of these constituents, with seasonal changes largest in the watersheds that had experienced the most deforestation. The second hypothesis was supported when all data were pooled in a mixed-model analysis such that conductivity declined with increasing percent forest or increased with increasing percent pasture; however, similar correlations with cations were not significant. The third hypothesis was supported, with decreasing nitrate concentrations observed as forest cover declined and pasture cover increased from upstream to downstream positions, exce... Mostrar Tudo |
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Palavras-Chave: |
Alteração; Chemical attributes; Eastern Amazon; Hidrobiogeoquímica; Riacho. |
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Thesagro: |
Rio; Uso da Terra. |
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Thesaurus NAL: |
Amazonia; Deforestation; Ecosystems; Nitrogen. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/25839/1/Figueiredo-et-al-2010-JGR.pdf
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Marc: |
LEADER 02889naa a2200325 a 4500
001 1873989
005 2021-09-13
008 2010 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1029/2009JG001200$2DOI
100 1 $aFIGUEIREDO, R. de O.
245 $aLand-use effects on the chemical attributes of low-order streams in the eastern Amazon.$h[electronic resource]
260 $c2010
520 $aDeforestation is altering small catchment hydrobiogeochemistry in the Amazon. To evaluate land use change effects on water chemistry and other measures of water quality, five low-order streams were studied in the eastern Amazon from April 2003 to October 2005. It was hypothesized that 1) cation loads would increase downstream as the area of cleared forest increased, particularly during the wet season, 2) increasing forest to pasture conversion would increase total solute loads, and 3) nitrate concentrations, which are high under mature forest, would decline with conversion to pasture, but would increase with increasing row crop agriculture. The first hypothesis was generally not supported, as there was no consistent observed increase in conductivity or cation concentrations from upstream to downstream. However, elevated wet-season measures of conductivity, alkalinity, and turbidity indicated increased wet season surface runoff of these constituents, with seasonal changes largest in the watersheds that had experienced the most deforestation. The second hypothesis was supported when all data were pooled in a mixed-model analysis such that conductivity declined with increasing percent forest or increased with increasing percent pasture; however, similar correlations with cations were not significant. The third hypothesis was supported, with decreasing nitrate concentrations observed as forest cover declined and pasture cover increased from upstream to downstream positions, except where crops were grown near the stream, which was associated with increased stream nitrate. In addition, stream temperature, dissolved oxygen, and pH were negatively correlated with percent forest cover while sodium, chloride, and turbidity also increased with percent crop cover. Turbidity, temperature, pH, and dissolved oxygen appear to be the simplest and most indicative parameters for detecting effects of land-use change on water quality in this region.
650 $aAmazonia
650 $aDeforestation
650 $aEcosystems
650 $aNitrogen
650 $aRio
650 $aUso da Terra
653 $aAlteração
653 $aChemical attributes
653 $aEastern Amazon
653 $aHidrobiogeoquímica
653 $aRiacho
700 1 $aMARKEWITZ, D.
700 1 $aDAVIDSON, E. A.
700 1 $aSCHULER, A. E.
700 1 $aWATRIN, O. dos S.
700 1 $aSILVA, P. de S.
773 $tJournal of Geophysical Research$gv. 115, G04004, Dec. 2010.
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Embrapa Solos (CNPS) |
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