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| Registros recuperados : 22 | |
| 7. |  | PALACE, M. W.; KELLER, M. M.; ASNER, G. P.; SILVA, J. N. M. Biomass and Necromass in Three Undisturbed Forests in the Brazilian Amazon. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 21.4.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 11. | | KELLER, M. M.; PALACE, M. W.; SILVA, J. N. M.; ASNER, G. P. Selective Logging Effects on Carbon Budgets at Three Sites in the Brazilian Amazon. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 21.3.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 12. | | KELLER, M.; VARNER, R.; DIAS, J. D.; SILVA, H.; CRILL, P.; OLIVEIRA JUNIOR, R. C. de; ASNER, G. P. Soil-atmosphere exchange of nitrous oxide, nitric oxide, methane, and carbon dioxide in logged and undisturbed forest in the Tapajos National Forest, Brazil. Earth Interactions, v. 9, n. 23, p. 1-28, Nov. 2005.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 14. | | ASNER, G. P.; PALACE, M.; KELLER, M.; PEREIRA JÚNIOR, R.; SILVA, J. N. M.; ZWEEDE, J. C. Estimating canopy structure in an Amazon forest from laser range finder and IKONOS satellite observations. Biotropica, v. 34, n. 4, p. 483-492, Dec. 2002.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 15. | | ASNER, G. P.; BROADBENT, E. N.; OLIVEIRA, P. J. C.; KELLER, M.; KNAPP, D.; SILVA, J. N. M. Condition and fate of logged forests in the Brazilian Amazon. PNAS, v. 103, n. 34, p. 12947-12950, Aug. 2006.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 16. | | ASNER, G. P.; KNAPP, D. E.; BROADBENT, E. N.; OLIVEIRA, P. J. C.; KELLER, M.; SILVA, J. N. Selective logging in the brazilian Amazon. Science, v. 310, n. 480, p. 480-482, 2005.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 17. | | HUNTER, M. O.; KELLER, M.; CAMARGO, P.; PALACE, M.; OLIVEIRA JUNIOR, R. C. de; ESPIRITO SANTO, F.; KEIZER, E.; LEFSKY, M.; ASNER, G. P. Forest structure at five LBA study sites. In: SCIENCE TEAM MEETING, 10., 2006, Brasília, DF. Book of Abstracts... Manaus: LBA-ECO, 2006. p. 29.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 18. | | HURTT, G.; XIAO, X.; KELLER, M.; PALACE, M.; ASNER, G. P.; BRASWELL, R.; BRONDÍZIO, E. S.; CARDOSO, M.; CARVALHO, C. J. R.; FEARON, M. G.; GUILD, L.; HAVEN, S.; HETRICK, S.; MOORE III, B.; NOBRE, C.; READ, J. M.; SÁ, T.; SCHLOSS, A.; VOURLITIS, G.; WICKEL, A. J. IKONOS imagery for the large scale biosphere-atmosphere experiment in Amazonia (LBA). Remote Sensing of Environment, v. 88, p.111-127, 2003. il.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 19. | | ESPÍRITO-SANTO, F. D. B.; GLOOR, M.; KELLER, M.; MALHI, Y.; SAATCHI, S.; NELSON, B.; OLIVEIRA JUNIOR, R. C.; PEREIRA, C.; LLOYD, J.; FROLKING, S.; PALACE, M.; SHIMABUKURO, Y. E.; DUARTE, V.; MONTEAGUDO MENDOZA, A.; LÓPEZ-GONZÁLEZ, G.; BAKER, T. R.; FELDPAUSCH, T. R.; BRIENEN, R. J. W.; ASNER, G. P.; BOYD, D. S.; PHILLIPS, O. L. Size and frequency of natural forest disturbances and the Amazon forest carbon balance. Nature Communications, v. 5, art. n. 3434, 18 Mar. 2014.| Biblioteca(s): Embrapa Amazônia Oriental; Embrapa Territorial. |
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| 20. | | BUSTAMANTE, M. M. C.; ROITMAN, I.; AIDE, T. M.; ALENCAR, A.; ANDERSON, L. O.; ARAGÃO, L.; ASNER, G. P.; BARLOW, J.; BERENGUER, E.; CHAMBERS, J.; COSTA, M. H.; FANIN, T.; FERREIRA, L. G.; FERREIRA, J.; KELLER, M.; MAGNUSSON, W. E.; MORALES-BARQUERO, L.; MORTON, D.; OMETTO, J. P. H. B.; PALACE, M.; PERES, C. A.; SILVÉRIO, D.; TRUMBORE, S.; VIEIRA, I. C. G. Toward an integrated monitoring framework to assess the effects of tropical forest degradation and recovery on carbon stocks and biodiversity. Global Change Biology, v. 22, n. 1, p. 92-109, Jan. 2016.| Biblioteca(s): Embrapa Amazônia Oriental; Embrapa Territorial. |
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| Registros recuperados : 22 | |
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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
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
24/06/2005 |
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Data da última atualização: |
08/11/2022 |
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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: |
ASNER, G. P.; PALACE, M.; KELLER, M.; PEREIRA JÚNIOR, R.; SILVA, J. N. M.; ZWEEDE, J. C. |
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Afiliação: |
GREGORY P. ASNER, Stanford University; MICHAEL PALACE, University of New Hampshire; MICHAEL KELLER, University of New Hampshire; RODRIGO PEREIRA JUNIOR, Fundação Floresta Tropical; JOSÉ NATALINO MACÊDO SILVA, Embrapa Amazônia Oriental; JOHAN C. ZWEEDE, Fundação Floresta Tropical. |
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Título: |
Estimating canopy structure in an Amazon forest from laser range finder and IKONOS satellite observations. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Biotropica, v. 34, n. 4, p. 483-492, Dec. 2002. |
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DOI: |
10.1111/j.1744-7429.2002.tb00568.x |
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Idioma: |
Inglês |
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Conteúdo: |
Canopy structural data can be used for biomass estimation and studies of carbon cycling, disturbance, energy balance, and hydrological processes in tropical forest ecosystems. Scarce information on canopy dimensions reflects the difficulties associated with measuring crown height, width, depth, and area in tall, humid tropical forests. New field and spaceborne observations provide an opportunity to acquire these measurements, but the accuracy and reliability of the methods are unknown. We used a handheld laser range finder to estimate tree crown height, diameter, and depth in a lowland tropical forest in the eastern Amazon, Brazil, for a sampling of 300 trees stratified by diameter at breast height (DBH). We found significant relationships between DBH and both tree height and crown diameter derived from the laser measurements. We also quantified changes in crown shape between tree height classes, finding a significant but weak positive trend between crown depth and width. We then compared the field-based measurements of crown diameter and area to estimates derived manually from panchromatic 0.8 m spatial resolution IKONOS satellite imagery. Median crown diameter derived from satellite observations was 78 percent greater than that derived from field-based laser measurements. The statistical distribution of crown diameters from IKONOS was biased toward larger trees, probably due to merging of smaller tree crowns, underestimation of understory trees, and overestimation of individual crown dimensions. The median crown area derived from IKONOS was 65 percent higher than the value modeled from field-based measurements. We conclude that manual interpretation of IKONOS satellite data did not accurately estimate distributions of tree crown dimensions in a tall tropical forest of eastern Amazonia. Other methods will be needed to more accurately estimate crown dimensions from high spatial resolution satellite imagery. MenosCanopy structural data can be used for biomass estimation and studies of carbon cycling, disturbance, energy balance, and hydrological processes in tropical forest ecosystems. Scarce information on canopy dimensions reflects the difficulties associated with measuring crown height, width, depth, and area in tall, humid tropical forests. New field and spaceborne observations provide an opportunity to acquire these measurements, but the accuracy and reliability of the methods are unknown. We used a handheld laser range finder to estimate tree crown height, diameter, and depth in a lowland tropical forest in the eastern Amazon, Brazil, for a sampling of 300 trees stratified by diameter at breast height (DBH). We found significant relationships between DBH and both tree height and crown diameter derived from the laser measurements. We also quantified changes in crown shape between tree height classes, finding a significant but weak positive trend between crown depth and width. We then compared the field-based measurements of crown diameter and area to estimates derived manually from panchromatic 0.8 m spatial resolution IKONOS satellite imagery. Median crown diameter derived from satellite observations was 78 percent greater than that derived from field-based laser measurements. The statistical distribution of crown diameters from IKONOS was biased toward larger trees, probably due to merging of smaller tree crowns, underestimation of understory trees, and overestimation of indiv... Mostrar Tudo |
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Palavras-Chave: |
Cobertura; Telemetro. |
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Thesagro: |
Biomassa; Floresta Tropical; Satélite; Sistema de Informação. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02701naa a2200265 a 4500
001 1406931
005 2022-11-08
008 2002 bl uuuu u00u1 u #d
024 7 $a10.1111/j.1744-7429.2002.tb00568.x$2DOI
100 1 $aASNER, G. P.
245 $aEstimating canopy structure in an Amazon forest from laser range finder and IKONOS satellite observations.
260 $c2002
520 $aCanopy structural data can be used for biomass estimation and studies of carbon cycling, disturbance, energy balance, and hydrological processes in tropical forest ecosystems. Scarce information on canopy dimensions reflects the difficulties associated with measuring crown height, width, depth, and area in tall, humid tropical forests. New field and spaceborne observations provide an opportunity to acquire these measurements, but the accuracy and reliability of the methods are unknown. We used a handheld laser range finder to estimate tree crown height, diameter, and depth in a lowland tropical forest in the eastern Amazon, Brazil, for a sampling of 300 trees stratified by diameter at breast height (DBH). We found significant relationships between DBH and both tree height and crown diameter derived from the laser measurements. We also quantified changes in crown shape between tree height classes, finding a significant but weak positive trend between crown depth and width. We then compared the field-based measurements of crown diameter and area to estimates derived manually from panchromatic 0.8 m spatial resolution IKONOS satellite imagery. Median crown diameter derived from satellite observations was 78 percent greater than that derived from field-based laser measurements. The statistical distribution of crown diameters from IKONOS was biased toward larger trees, probably due to merging of smaller tree crowns, underestimation of understory trees, and overestimation of individual crown dimensions. The median crown area derived from IKONOS was 65 percent higher than the value modeled from field-based measurements. We conclude that manual interpretation of IKONOS satellite data did not accurately estimate distributions of tree crown dimensions in a tall tropical forest of eastern Amazonia. Other methods will be needed to more accurately estimate crown dimensions from high spatial resolution satellite imagery.
650 $aBiomassa
650 $aFloresta Tropical
650 $aSatélite
650 $aSistema de Informação
653 $aCobertura
653 $aTelemetro
700 1 $aPALACE, M.
700 1 $aKELLER, M.
700 1 $aPEREIRA JÚNIOR, R.
700 1 $aSILVA, J. N. M.
700 1 $aZWEEDE, J. C.
773 $tBiotropica$gv. 34, n. 4, p. 483-492, Dec. 2002.
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