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| 2. |  | GOMES, M. L. M.; SANTOS, N. V. DOS; FAVERO, A. P. Caracterização reprodutiva de híbridos interespecíficos de Paspalum do grupo Plicatula. In: JORNADA CIENTÍFICA DA EMBRAPA SÃO CARLOS, 14., 2022, São Carlos, SP. Anais... São Carlos, SP: Embrapa Instrumentação; Embrapa Pecuária Sudeste, 2022. p. 54. (Embrapa Instrumentação. Documentos, 73).| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 3. | | RANGEL-VASCONCELOS, L. G. T.; KATO, O. R.; VASCONCELOS, S. S.; OLIVEIRA, F. de A.; PAIM, A. F.; GREFF, L. T. B.; SOARES, K. P.; BARROS, L.; SANTOS, N. V. dos. Biomassa e estoques de nutrientes em vegetação de pousio sob diferentes manejos em sistema agroflorestal seqüencial de corte-e-trituração na Amazônia Oriental. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 8., 2011, Belém, PA. Anais... Belém, PA: SBSAF: Embrapa Amazônia Oriental: UFRA: CEPLAC: EMATER: ICRAF, 2011. 1 CD-ROM. Editores técnicos: Roberto Porro, Milton Kanashiro, Maria do Socorro Gonçalves Ferreira, Leila Sobral Sampaio e Gladys Ferreira de Sousa.| Biblioteca(s): Embrapa Amazônia Oriental. |
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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: |
08/07/2005 |
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Data da última atualização: |
30/11/2022 |
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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: |
VIEIRA, I. C. G.; ALMEIDA, A. S. de; DAVIDSON, E. A.; STONE, T. A.; CARVALHO, C. J. R. de; GUERRERO, J. B. |
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Afiliação: |
IMA CÉLIA G. VIEIRA, MPEG; ARLETE SILVA DE ALMEIDA, MPEG; ERIC A. DAVIDSON, The Woods Hole Research Center; THOMAS A. STONE, The Woods Hole Research Center; CLAUDIO JOSE REIS DE CARVALHO, CPATU; JOSÉ BENITO GUERRERO, Instituto de Pesquisa Ambiental da Amazônia. |
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Título: |
Classifying successional forests using landsat spectral properties and ecological characteristics in eastern Amazônia. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Remote Sensing of Environment, v. 87, n. 4, p. 470-481, 2003. |
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Descrição Física: |
il. |
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DOI: |
http://dx.doi.org/10.1016/j.rse.2002.09.002 |
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Idioma: |
Inglês |
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Conteúdo: |
Secondary forests may become increasingly important as temporary reservoirs of genetic diversity, stocks of carbon and nutrients, and moderators of hydrologic cycles in the Amazon Basin as agricultural lands are abandoned and often later cleared again for agriculture. We studied a municipality in northeastern Pará, Brazil, that has been settled for over a century and where numerous cycles of slash and burn agriculture have occurred. The forests were grouped into young (3?6 years), intermediate (10?20 years), advanced (40?70 years), and mature successional stages using 1999 Landsat 7 ETM imagery. Supervised classification of the imagery showed that these forest classes occupied 22%, 13%, 9%, and 6% of the area, respectively. Although this area underwent widespread deforestation many decades ago, forest of some type covers about 50% of the area. Row crops, tree crops, and pastures cover 8%, 20%, and 22%, respectively. The best separation among land covers appeared in a plot of NDVI versus band 5 reflectance. The same groupings of successional forests were derived independently from indices of similarity among tree species composition. Measured distributions of tree height and diameter also covaried with these successional classes, with the young forests having nearly uniform distributions, whereas multiple height and diameter classes were present in the advanced successional forests. Biomass accumulated more slowly in this secondary forest chronosequence than has been reported for other areas, which explains why the 70-year-old forests here were still distinguishable from mature forests using spectral properties. Rates of forest regrowth may vary across regions due to differences in edaphic, climatic, and historical land-use factors, thus rendering most relationships among spectral properties and forest age site-specific. Successional status, as characterized by species composition, biomass, and distributions of heights and diameters, may be superior to stand age as a means of stratifying these forests for characterization of spectral properties. MenosSecondary forests may become increasingly important as temporary reservoirs of genetic diversity, stocks of carbon and nutrients, and moderators of hydrologic cycles in the Amazon Basin as agricultural lands are abandoned and often later cleared again for agriculture. We studied a municipality in northeastern Pará, Brazil, that has been settled for over a century and where numerous cycles of slash and burn agriculture have occurred. The forests were grouped into young (3?6 years), intermediate (10?20 years), advanced (40?70 years), and mature successional stages using 1999 Landsat 7 ETM imagery. Supervised classification of the imagery showed that these forest classes occupied 22%, 13%, 9%, and 6% of the area, respectively. Although this area underwent widespread deforestation many decades ago, forest of some type covers about 50% of the area. Row crops, tree crops, and pastures cover 8%, 20%, and 22%, respectively. The best separation among land covers appeared in a plot of NDVI versus band 5 reflectance. The same groupings of successional forests were derived independently from indices of similarity among tree species composition. Measured distributions of tree height and diameter also covaried with these successional classes, with the young forests having nearly uniform distributions, whereas multiple height and diameter classes were present in the advanced successional forests. Biomass accumulated more slowly in this secondary forest chronosequence than has been reported... Mostrar Tudo |
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Thesagro: |
Biodiversidade; Biomassa; Desmatamento; Ecologia Florestal; Floresta Secundaria; Sensoriamento Remoto. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02979naa a2200289 a 4500
001 1407035
005 2022-11-30
008 2003 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.rse.2002.09.002$2DOI
100 1 $aVIEIRA, I. C. G.
245 $aClassifying successional forests using landsat spectral properties and ecological characteristics in eastern Amazônia.$h[electronic resource]
260 $c2003
300 $cil.
520 $aSecondary forests may become increasingly important as temporary reservoirs of genetic diversity, stocks of carbon and nutrients, and moderators of hydrologic cycles in the Amazon Basin as agricultural lands are abandoned and often later cleared again for agriculture. We studied a municipality in northeastern Pará, Brazil, that has been settled for over a century and where numerous cycles of slash and burn agriculture have occurred. The forests were grouped into young (3?6 years), intermediate (10?20 years), advanced (40?70 years), and mature successional stages using 1999 Landsat 7 ETM imagery. Supervised classification of the imagery showed that these forest classes occupied 22%, 13%, 9%, and 6% of the area, respectively. Although this area underwent widespread deforestation many decades ago, forest of some type covers about 50% of the area. Row crops, tree crops, and pastures cover 8%, 20%, and 22%, respectively. The best separation among land covers appeared in a plot of NDVI versus band 5 reflectance. The same groupings of successional forests were derived independently from indices of similarity among tree species composition. Measured distributions of tree height and diameter also covaried with these successional classes, with the young forests having nearly uniform distributions, whereas multiple height and diameter classes were present in the advanced successional forests. Biomass accumulated more slowly in this secondary forest chronosequence than has been reported for other areas, which explains why the 70-year-old forests here were still distinguishable from mature forests using spectral properties. Rates of forest regrowth may vary across regions due to differences in edaphic, climatic, and historical land-use factors, thus rendering most relationships among spectral properties and forest age site-specific. Successional status, as characterized by species composition, biomass, and distributions of heights and diameters, may be superior to stand age as a means of stratifying these forests for characterization of spectral properties.
650 $aAmazonia
650 $aBiodiversidade
650 $aBiomassa
650 $aDesmatamento
650 $aEcologia Florestal
650 $aFloresta Secundaria
650 $aSensoriamento Remoto
700 1 $aALMEIDA, A. S. de
700 1 $aDAVIDSON, E. A.
700 1 $aSTONE, T. A.
700 1 $aCARVALHO, C. J. R. de
700 1 $aGUERRERO, J. B.
773 $tRemote Sensing of Environment$gv. 87, n. 4, p. 470-481, 2003.
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