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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: |
05/09/2008 |
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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: |
DAVIDSON, E. A.; ASNER, G. P.; STONE, T. A.; NEILL, C.; FIGUEIREDO, R. de O. |
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Afiliação: |
Eric A. Davidson, Woods Hole Research Center; Gregory P. Asner, Carnegie Institute; Thomas A. Stone, Woods Hole Research Center; Christopher Neill, Marine Biological Laboratory; RICARDO DE OLIVEIRA FIGUEIREDO, CPATU. |
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Título: |
Objective indicators of pasture degradation from spectral mixture analysis of landsat imagery. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Journal of Geophysical Research: Biogeosciences, v.113, n. G1, Mar. 2008. |
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DOI: |
10.1029/2007JG000622 |
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Idioma: |
Inglês |
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Conteúdo: |
Degradation of cattle pastures is a management concern that influences future land use in Amazonia. However, ?degradation? is poorly defined and has different meanings for ranchers, ecologists, and policy makers. Here we analyze pasture degradation using objective scalars of photosynthetic vegetation (PV), nonphotosynthetic vegetation (NPV), and exposed soil (S) derived from Landsat imagery. A general, probabilistic spectral mixture model decomposed satellite spectral reflectance measurements into subpixel estimates of PV, NPV, and S covers at ranches in western and eastern Amazonia. Most pasture management units at all ranches fell along a single line of decreasing PV with increasing NPV and S, which could be considered a degradation continuum. The ranch with the highest stocking densities and most intensive management had greater NPV and S than a less intensively managed ranch. The number of liming, herbiciding, and disking treatments applied to each pasture management unit was positively correlated with NPV and negatively correlated with PV. Although these objective scalars revealed signs of degradation, intensive management kept exposed soil to <40% cover and maintained economically viable cattle production over several decades. In ranches with few management inputs, the high PV cover in young pastures declined with increasing pasture age, while NPV and S increased, even where grazing intensity was low. Both highly productive pastures and vigorous regrowth of native vegetation cause high PV values. Analysis of spectral properties holds promise for identifying areas where grazing intensity has exceeded management inputs, thus increasing coverage of senescent foliage and exposed soil. MenosDegradation of cattle pastures is a management concern that influences future land use in Amazonia. However, ?degradation? is poorly defined and has different meanings for ranchers, ecologists, and policy makers. Here we analyze pasture degradation using objective scalars of photosynthetic vegetation (PV), nonphotosynthetic vegetation (NPV), and exposed soil (S) derived from Landsat imagery. A general, probabilistic spectral mixture model decomposed satellite spectral reflectance measurements into subpixel estimates of PV, NPV, and S covers at ranches in western and eastern Amazonia. Most pasture management units at all ranches fell along a single line of decreasing PV with increasing NPV and S, which could be considered a degradation continuum. The ranch with the highest stocking densities and most intensive management had greater NPV and S than a less intensively managed ranch. The number of liming, herbiciding, and disking treatments applied to each pasture management unit was positively correlated with NPV and negatively correlated with PV. Although these objective scalars revealed signs of degradation, intensive management kept exposed soil to <40% cover and maintained economically viable cattle production over several decades. In ranches with few management inputs, the high PV cover in young pastures declined with increasing pasture age, while NPV and S increased, even where grazing intensity was low. Both highly productive pastures and vigorous regrowth of native vege... Mostrar Tudo |
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Thesagro: |
Análise do Solo; Deterioração do Solo; Pastagem; Solo; Uso da Terra. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02443naa a2200241 a 4500
001 1407127
005 2022-11-23
008 2008 bl uuuu u00u1 u #d
024 7 $a10.1029/2007JG000622$2DOI
100 1 $aDAVIDSON, E. A.
245 $aObjective indicators of pasture degradation from spectral mixture analysis of landsat imagery.$h[electronic resource]
260 $c2008
520 $aDegradation of cattle pastures is a management concern that influences future land use in Amazonia. However, ?degradation? is poorly defined and has different meanings for ranchers, ecologists, and policy makers. Here we analyze pasture degradation using objective scalars of photosynthetic vegetation (PV), nonphotosynthetic vegetation (NPV), and exposed soil (S) derived from Landsat imagery. A general, probabilistic spectral mixture model decomposed satellite spectral reflectance measurements into subpixel estimates of PV, NPV, and S covers at ranches in western and eastern Amazonia. Most pasture management units at all ranches fell along a single line of decreasing PV with increasing NPV and S, which could be considered a degradation continuum. The ranch with the highest stocking densities and most intensive management had greater NPV and S than a less intensively managed ranch. The number of liming, herbiciding, and disking treatments applied to each pasture management unit was positively correlated with NPV and negatively correlated with PV. Although these objective scalars revealed signs of degradation, intensive management kept exposed soil to <40% cover and maintained economically viable cattle production over several decades. In ranches with few management inputs, the high PV cover in young pastures declined with increasing pasture age, while NPV and S increased, even where grazing intensity was low. Both highly productive pastures and vigorous regrowth of native vegetation cause high PV values. Analysis of spectral properties holds promise for identifying areas where grazing intensity has exceeded management inputs, thus increasing coverage of senescent foliage and exposed soil.
650 $aAnálise do Solo
650 $aDeterioração do Solo
650 $aPastagem
650 $aSolo
650 $aUso da Terra
700 1 $aASNER, G. P.
700 1 $aSTONE, T. A.
700 1 $aNEILL, C.
700 1 $aFIGUEIREDO, R. de O.
773 $tJournal of Geophysical Research: Biogeosciences$gv.113, n. G1, Mar. 2008.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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| Registros recuperados : 56 | |
| 25. |  | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 26. | | 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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| 28. | | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 29. | | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 31. | | 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.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 32. | | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 33. | | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 34. | | VIEIRA, I. C. G.; ALMEIDA, A. S. de; DAVIDSON, E. A.; STONE, T. A.; CARVALHO, C. J. R. de; GUERRERO, J. B. Classifying successional forests using landsat spectral properties and ecological characteristics in eastern Amazônia. Remote Sensing of Environment, v. 87, n. 4, p. 470-481, 2003. il.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 35. | | ALMEIDA, A. S. de; VIEIRA, I. C. G.; DAVIDSON, E. A.; STONE, T. A.; CARVALHO, C. J. R. de; GUERRERO, J. B. Classifying successional forests using landsat spectral properties and ecological characteristics to evaluate recent trends in land cover and carbon loss in eastern Amazonia. In: CONFERÊNCIA CIENTÍFICA INTERNACIONAL DO LBA, 2., 2002, Manaus. Resumos. Manaus: LBA, 2002. Não paginado.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 36. | | SERRÃO, B. de O.; DUTRA, F. C.; SANTOS, M. T. P. dos; SOUZA, C. M. de A.; TRINDADE, I. A.; CARVALHO, C. J. R. de; DAVIDSON, E. A. Carbono e nitrogênio na biomassa microbiana do solo de uma área de pastagem abandonada, três anos após fertilização com N e P. In: CONGRESSO DE ESTUDANTES E BOLSISTAS DO EXPERIMENTO LBA, 2., 2005, Manaus. Resumos... [S.l.]: LBA, [2005?]. p. 45.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 37. | | CARVALHO, C. J. R. de; CHU, E. Y.; DAVIDSON, E. A.; SANTOS, M. T. P. dos; FIGUEIREDO, R. de O.; FREIRE, G. S.; PANTOJA, K. de F. R. Mechanisms of conservation and cycling of N and P in a chronosequence of secondary vegetation in Eastern Amazonia. In: CONFERÊNCIA CIENTÍFICA INTERNACIONAL DO LBA, 2., 2002, Manaus. Resumos... Manaus: LBA, 2002. Não paginado.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 38. | | 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.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 39. | | 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.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 40. | | SIDDIQUE, I.; VIEIRA, I. C. G.; SCHMIDT, S.; LAMB, D.; CARVALHO, C. J. R. de; FIGUEIREDO, R. de O.; DAVIDSON, E. A. Early-successional dynamics of tree species composition in relation to nitrogen and phosphorus supply in degraded pasture in Eastern Amazonia. In: ESAR/SER JOINT MEETING, 2007, San Jose, California. Abstract. San Jose: San Jose State University, 2007. Abstract ID: 4655. Password: 290749.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 56 | |
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