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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 : 6 | |
| 1. |  | BORGES, M. A.; CAMPOS, F. T. de; GOULARTE, K. L.; PRADIEÉ, J.; PEGORARO, L. M. C. Correlação entre a atividade da paraoxoanase (PON1) no soro sanguíneo e parâmetros seminais de ovinos. In: CONGRESSO DE INICIAÇÃO CIENTÍFICA, 25.; SEMANA INTEGRADA DE ENSINO, PESQUISA E EXTENSÃO, 2., 2016, Pelotas. Anais... Pelotas: UFPel, 2016.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 2. | | VARGAS JÚNIOR, S. F.; COSTA, V. G. G.; OLIVEIRA, F. C. de; GOULARTE, K. L.; HAAS, C. S.; GASPERIN, B. G.; LUCIA JÚNIOR, T. Bovine sperm cell motility after incubation in follicular fluid; Pesquisa Agropecuária Brasileira, Brasília, DF, v. 53, n. 7, p. 866-869, July, 2018. Scientific Notes. Título em português: Motilidade de espermatozoides bovinos após incubação em fluído folicular.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 3. | | VIEIRA, A. D.; QUIRINO, M. S.; GOULARTE, K. L.; FERREIRA, C. E. R.; GASTAL, G. D. A.; PEGORARO, L. M. C.; MONDADORI, R. G.; GASPERIN, B. G. Different embryo collection methods and superovulation protocols in crioula lanada ewes. Animal Reproduction, v. 12, n. 3, p. 685, Jul./Sept. 2015. Publicado: Proceedings of the 29th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Gramado, RS, Brazil, August 20th to 23rd, 2015, and 31st Meeting of the European Embryo Transfer Association (AETE); Ghent, Belgium,...| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 4. | | FERREIRA, C. E. R.; HAAS, C. S.; GOULARTE, K. L.; ROVANI, M. T.; CARDOSO, F. F.; SCHNEIDER, A.; GASPERIN, B. G.; LUCIA JUNIOR, T. Expression of paraoxonase types 1, 2 and 3 in reproductive tissues and activity of paraoxonase type 1 in the serum and seminal plasma of bulls. Andrologia, v. 50, n. 3, e12923, Apr. 2018.| Tipo: Artigo em Periódico Indexado |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 5. | | FERREIRA, C. E. R.; CAMPOS, G. S.; SCHMIDT, P. I.; SOLLERO, B. P.; GOULARTE, K. L.; CORCINI, C. D.; GASPERIN, B. G.; LUCIA JUNIOR, T.; BOLIGON, A. A.; CARDOSO, F. F. Genome-wide association and genomic prediction for scrotal circumference in Hereford and Braford bulls. Theriogenology, v. 172, p. 268-280, Sept. 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 6. | | GOULARTE, K. L.; PINTO, M. L. G.; CASALI, R.; FERREIRRA, C. E. R.; GASTAL, G. D. A.; BORGARTZ, A.; GASPERIN, B. G.; MONDADORI, R. G.; PEGORARO, L. M. C.; MEZZALIRA, A.; VIEIRA, A. D. Which is the best protocol for cervical dilatation in sheep embryo collection? Animal Reproduction, v.10, n.3, p. 461, Jul./Sept. 2013 Publicado no: roceedings of the 27th Annual Meeting of the Brazilian Embryo Technology Society (SBTE), August 29th to September 1st, 2013, Praia do Forte, BA, Brazil.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| Registros recuperados : 6 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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