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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 |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
08/07/2005 |
Data da última atualização: |
30/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
VIEIRA, I. C. G.; ALMEIDA, A. S. de; DAVIDSON, E. A.; STONE, T. A.; CARVALHO, C. J. R. de; GUERRERO, J. B. |
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. |
Título: |
Classifying successional forests using landsat spectral properties and ecological characteristics in eastern Amazônia. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Remote Sensing of Environment, v. 87, n. 4, p. 470-481, 2003. |
Descrição Física: |
il. |
DOI: |
http://dx.doi.org/10.1016/j.rse.2002.09.002 |
Idioma: |
Inglês |
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 |
Thesagro: |
Biodiversidade; Biomassa; Desmatamento; Ecologia Florestal; Floresta Secundaria; Sensoriamento Remoto. |
Thesaurus Nal: |
Amazonia. |
Categoria do assunto: |
-- |
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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Embrapa Amazônia Oriental (CPATU) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
27/04/2020 |
Data da última atualização: |
12/07/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
BLASSIOLI-MORAES, M. C.; KHRIMIAN, A.; MICHEREFF, M. F. F.; MAGALHÃES, D. M.; HICKEL, E.; FREITAS, T. F. S. de; BARRIGOSSI, J. A. F.; LAUMANN, R. A.; SILVA, A. T.; GUGGILAPU, S. D.; SILVA, C. C.; SANT'ANA, J.; BORGES, M. |
Afiliação: |
MARIA CAROLINA BLASSIOLI MORAES, Cenargen; A. KHRIMIAN, USDA-ARS; D. M. MAGALHAES, CENARGEN; E. HICKEL, EPAGRI; T. F. S. DE FREITAS, UFRGS; JOSE ALEXANDRE F BARRIGOSSI, CNPAF; RAUL ALBERTO LAUMANN, Cenargen; S. D. GUGGILAPU, USA; J. SANT'ANA, UFRGS; MIGUEL BORGES, Cenargen. |
Título: |
Male-produced sex pheromone of Tibraca limbativentris revisited: absolute configurations of Zingiberenol Stereoisomers and their influence on chemotaxis behavior of conspecific females. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Journal of Chemical Ecology, v. 46, n. 1, p. 1-9, 2020. |
DOI: |
https://doi.org/10.1007/s10886-019-01125-w |
Idioma: |
Inglês |
Conteúdo: |
The rice stalk stink bug, Tibraca limbativentris, is an important rice pest in Brazil with a high invasive potential for Mexico and the USA. The sex pheromone of this species was previously identified as a combination of two stereoisomers of 1,10-bisaboladien-3-ol (zingiberenol), but the absolute configurations of these sesquiterpenes were not determined, neither were their effect(s) on T. limbativentris behavior evaluated. In this study, using two chiral columns, we compared retention times of the two natural 1,10-bisaboladien-3-ol stereoisomers from air-entrainment samples of male T. limbativentris with those of synthetic stereoisomers of 1,10-bisaboladien-3-ol. The results showed that T. limbativentris males produce (3S,6S,7R)-1,10-bisaboladien-3-ol (1) and (3R,6S,7R)-1,10-bisaboladien-3-ol (5) as their sex pheromone. Two new minor, male-specific components were also identified as cis and trans isomers of 2,10-bisaboladien-1-ol (sesquipiperitol). Y-tube olfactometer bioassays showed that the major (3S,6S,7R) isomer 1 was essential for attraction of T. limbativentris females, but the minor (3R,6S,7R) isomer 2 was not, nor did it show synergistic/antagonistic effects when added to the major isomer. The (1S,6S,7R) and (1R,6S,7R) stereoisomers of sesquipepiritol also attracted T. limbativentris females. |
Palavras-Chave: |
Rice pest; Stink bug behavior. |
Thesagro: |
Arroz; Oryza Sativa; Praga de Planta; Tibraca Limbativentris. |
Thesaurus NAL: |
Attractants; Plant pests; Rice. |
Categoria do assunto: |
-- O Insetos e Entomologia |
Marc: |
LEADER 02522naa a2200385 a 4500 001 2121839 005 2022-07-12 008 2020 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1007/s10886-019-01125-w$2DOI 100 1 $aBLASSIOLI-MORAES, M. C. 245 $aMale-produced sex pheromone of Tibraca limbativentris revisited$babsolute configurations of Zingiberenol Stereoisomers and their influence on chemotaxis behavior of conspecific females.$h[electronic resource] 260 $c2020 520 $aThe rice stalk stink bug, Tibraca limbativentris, is an important rice pest in Brazil with a high invasive potential for Mexico and the USA. The sex pheromone of this species was previously identified as a combination of two stereoisomers of 1,10-bisaboladien-3-ol (zingiberenol), but the absolute configurations of these sesquiterpenes were not determined, neither were their effect(s) on T. limbativentris behavior evaluated. In this study, using two chiral columns, we compared retention times of the two natural 1,10-bisaboladien-3-ol stereoisomers from air-entrainment samples of male T. limbativentris with those of synthetic stereoisomers of 1,10-bisaboladien-3-ol. The results showed that T. limbativentris males produce (3S,6S,7R)-1,10-bisaboladien-3-ol (1) and (3R,6S,7R)-1,10-bisaboladien-3-ol (5) as their sex pheromone. Two new minor, male-specific components were also identified as cis and trans isomers of 2,10-bisaboladien-1-ol (sesquipiperitol). Y-tube olfactometer bioassays showed that the major (3S,6S,7R) isomer 1 was essential for attraction of T. limbativentris females, but the minor (3R,6S,7R) isomer 2 was not, nor did it show synergistic/antagonistic effects when added to the major isomer. The (1S,6S,7R) and (1R,6S,7R) stereoisomers of sesquipepiritol also attracted T. limbativentris females. 650 $aAttractants 650 $aPlant pests 650 $aRice 650 $aArroz 650 $aOryza Sativa 650 $aPraga de Planta 650 $aTibraca Limbativentris 653 $aRice pest 653 $aStink bug behavior 700 1 $aKHRIMIAN, A. 700 1 $aMICHEREFF, M. F. F. 700 1 $aMAGALHÃES, D. M. 700 1 $aHICKEL, E. 700 1 $aFREITAS, T. F. S. de 700 1 $aBARRIGOSSI, J. A. F. 700 1 $aLAUMANN, R. A. 700 1 $aSILVA, A. T. 700 1 $aGUGGILAPU, S. D. 700 1 $aSILVA, C. C. 700 1 $aSANT'ANA, J. 700 1 $aBORGES, M. 773 $tJournal of Chemical Ecology$gv. 46, n. 1, p. 1-9, 2020.
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