| |
|
|
| 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. |
|    |
| 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. |
| |
| 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. |
| |
| 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. |
| |
| 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. |
|  |
| 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. |
| |
| 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. |
| |
| 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. |
| |
| Registros recuperados : 62 | |
|
|
|
 | 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: |
18/12/2009 |
|
Data da última atualização: |
08/06/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
Internacional - A |
|
Autoria: |
MARKEWITZ, D.; RESENDE, J. C. F.; PARRON, L.; BUSTAMANTE, M.; KLINK, C. A.; FIGUEIREDO, R. de O.; DAVIDSON, E. A. |
|
Afiliação: |
DANIEL MARKEWITZ, The University of Georgia; JULIO C. F. RESENDE, UNB; LUCILIA PARRON, UNB; MERCEDES BUSTAMANTE, UNB; CARLOS A. KLINK, UNB; RICARDO DE OLIVEIRA FIGUEIREDO, CPATU; ERIC A. DAVIDSON, The Woods Hole Research Center. |
|
Título: |
Dissolved rainfall inputs and streamwater outputs in an undisturbed watershed on highly weathered soils in the brazilian cerrado. |
|
Ano de publicação: |
2006 |
|
Fonte/Imprenta: |
Hydrological Processes, v. 20, n. 12, p. 2615-2639, Aug. 2006. |
|
DOI: |
10.1002/hyp.6219 |
|
Idioma: |
Inglês |
|
Conteúdo: |
The cerrados of Brazil cover 2 million km2. Despite the extent of these seasonally dry ecosystems, little watershed research has been focused in this region, particularly relative to the watersheds of the Amazon Basin. The cerrado shares pedogenic characteristics with the Amazon Basin in draining portions of the Brazilian shield and in possessing Oxisols over much of the landscape. The objective of this research was to quantify the stream water geochemical relationships of an undisturbed 1200 ha cerrado watershed for comparison to river geochemistry in the Amazon. Furthermore, this undisturbed watershed was used to evaluate stream discharge versus dissolved ion concentration relationships. This research was conducted in the Córrego Roncador watershed of the Reserva Ecológica do Roncador (RECOR) of the Instituto Brasileiro Geografia e Estatística (IBGE) near Brasilia, Brazil. Bulk precipitation and stream water chemistry were analysed between May 1998 and May 2000. The upland soils of this watershed are nutrient poor possessing total stocks of exchangeable elements in the upper 1 m of 81 ± 13, 77 ± 4, 25 ± 3, and 1 ± 1 kg ha?1 of K, Ca, Mg, and P, respectively. Bulk precipitation inputs of dissolved nutrients for this watershed are low and consistent with previous estimates. The nutrient-poor soils of this watershed, however, increase the relative importance of precipitation for nutrient replenishment to vegetation during episodes of ecosystem disturbance. Stream water dissolved loads were extremely dilute with conductivities ranging from 4 to 10 µS cm?1 during periods of high- and low-flow, respectively. Despite the low concentrations in this stream, geochemical relationships were similar to other Amazonian streams draining shield geologies. Discharge-concentration relationships for Ca and Mg in these highly weathered soils developed from igneous rocks of the Brazilian shield demonstrated a significant negative relationship indicating a continued predominance of groundwater baseflow contributions these cationic elements. Copyright © 2006 John Wiley & Sons, Ltd. MenosThe cerrados of Brazil cover 2 million km2. Despite the extent of these seasonally dry ecosystems, little watershed research has been focused in this region, particularly relative to the watersheds of the Amazon Basin. The cerrado shares pedogenic characteristics with the Amazon Basin in draining portions of the Brazilian shield and in possessing Oxisols over much of the landscape. The objective of this research was to quantify the stream water geochemical relationships of an undisturbed 1200 ha cerrado watershed for comparison to river geochemistry in the Amazon. Furthermore, this undisturbed watershed was used to evaluate stream discharge versus dissolved ion concentration relationships. This research was conducted in the Córrego Roncador watershed of the Reserva Ecológica do Roncador (RECOR) of the Instituto Brasileiro Geografia e Estatística (IBGE) near Brasilia, Brazil. Bulk precipitation and stream water chemistry were analysed between May 1998 and May 2000. The upland soils of this watershed are nutrient poor possessing total stocks of exchangeable elements in the upper 1 m of 81 ± 13, 77 ± 4, 25 ± 3, and 1 ± 1 kg ha?1 of K, Ca, Mg, and P, respectively. Bulk precipitation inputs of dissolved nutrients for this watershed are low and consistent with previous estimates. The nutrient-poor soils of this watershed, however, increase the relative importance of precipitation for nutrient replenishment to vegetation during episodes of ecosystem disturbance. Stream water dissol... Mostrar Tudo |
|
Palavras-Chave: |
Watershed. |
|
Thesaurus NAL: |
geochemistry; nutrient balance. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02860naa a2200241 a 4500
001 1578388
005 2022-06-08
008 2006 bl uuuu u00u1 u #d
024 7 $a10.1002/hyp.6219$2DOI
100 1 $aMARKEWITZ, D.
245 $aDissolved rainfall inputs and streamwater outputs in an undisturbed watershed on highly weathered soils in the brazilian cerrado.$h[electronic resource]
260 $c2006
520 $aThe cerrados of Brazil cover 2 million km2. Despite the extent of these seasonally dry ecosystems, little watershed research has been focused in this region, particularly relative to the watersheds of the Amazon Basin. The cerrado shares pedogenic characteristics with the Amazon Basin in draining portions of the Brazilian shield and in possessing Oxisols over much of the landscape. The objective of this research was to quantify the stream water geochemical relationships of an undisturbed 1200 ha cerrado watershed for comparison to river geochemistry in the Amazon. Furthermore, this undisturbed watershed was used to evaluate stream discharge versus dissolved ion concentration relationships. This research was conducted in the Córrego Roncador watershed of the Reserva Ecológica do Roncador (RECOR) of the Instituto Brasileiro Geografia e Estatística (IBGE) near Brasilia, Brazil. Bulk precipitation and stream water chemistry were analysed between May 1998 and May 2000. The upland soils of this watershed are nutrient poor possessing total stocks of exchangeable elements in the upper 1 m of 81 ± 13, 77 ± 4, 25 ± 3, and 1 ± 1 kg ha?1 of K, Ca, Mg, and P, respectively. Bulk precipitation inputs of dissolved nutrients for this watershed are low and consistent with previous estimates. The nutrient-poor soils of this watershed, however, increase the relative importance of precipitation for nutrient replenishment to vegetation during episodes of ecosystem disturbance. Stream water dissolved loads were extremely dilute with conductivities ranging from 4 to 10 µS cm?1 during periods of high- and low-flow, respectively. Despite the low concentrations in this stream, geochemical relationships were similar to other Amazonian streams draining shield geologies. Discharge-concentration relationships for Ca and Mg in these highly weathered soils developed from igneous rocks of the Brazilian shield demonstrated a significant negative relationship indicating a continued predominance of groundwater baseflow contributions these cationic elements. Copyright © 2006 John Wiley & Sons, Ltd.
650 $ageochemistry
650 $anutrient balance
653 $aWatershed
700 1 $aRESENDE, J. C. F.
700 1 $aPARRON, L.
700 1 $aBUSTAMANTE, M.
700 1 $aKLINK, C. A.
700 1 $aFIGUEIREDO, R. de O.
700 1 $aDAVIDSON, E. A.
773 $tHydrological Processes$gv. 20, n. 12, p. 2615-2639, Aug. 2006.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
