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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: |
01/11/2019 |
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Data da última atualização: |
01/11/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MÕTTUS, M.; ARAGÃO, L.; BÄCK, J.; HERNÁNDEZ-CLEMENTE, R.; MAEDA, E. E.; MARKIET, V.; NICHOL, C.; OLIVEIRA JUNIOR, R. C. de; RESTREPO-COUPE, N. |
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Afiliação: |
Matti Mõttus, VTT Technical Research Centre of Finland; LUIZ ARAGÃO, INPE; Jaana Bäck, University of Helsinki; Rocío Hernández-Clemente, Swansea University; Eduardo Eiji Maeda, University of Helsinki; Vincent Markiet, VTT Technical Research Centre of Finland; Caroline Nichol, University of Edinburgh; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; Natalia Restrepo-Coupe, University of Arizona. |
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Título: |
Diurnal changes in leaf photochemical reflectance index in two evergreen forest canopies. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, v. 12, n. 7, p. 2236-2243, July 2019. |
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Idioma: |
Inglês |
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Conteúdo: |
The spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes?a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD. MenosThe spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes?a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured da... Mostrar Tudo |
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Palavras-Chave: |
Eficiência no uso da luz. |
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Thesagro: |
Floresta Tropical; Pinus Sylvestris. |
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Thesaurus Nal: |
Amazonia; Betula pendula; Manilkara. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02662naa a2200289 a 4500
001 2113820
005 2019-11-01
008 2019 bl uuuu u00u1 u #d
100 1 $aMÕTTUS, M.
245 $aDiurnal changes in leaf photochemical reflectance index in two evergreen forest canopies.$h[electronic resource]
260 $c2019
520 $aThe spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes?a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD.
650 $aAmazonia
650 $aBetula pendula
650 $aManilkara
650 $aFloresta Tropical
650 $aPinus Sylvestris
653 $aEficiência no uso da luz
700 1 $aARAGÃO, L.
700 1 $aBÄCK, J.
700 1 $aHERNÁNDEZ-CLEMENTE, R.
700 1 $aMAEDA, E. E.
700 1 $aMARKIET, V.
700 1 $aNICHOL, C.
700 1 $aOLIVEIRA JUNIOR, R. C. de
700 1 $aRESTREPO-COUPE, N.
773 $tIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing$gv. 12, n. 7, p. 2236-2243, July 2019.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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| Registros recuperados : 41 | |
| 9. |  | BARNI, P. E.; BARBOSA, R. I.; XAUD, H. A. M.; XAUD, M. R.; FEARNSIDE, P. M. Precipitação no extremo norte da Amazônia: distribuição espacial no estado de Roraima, Brasil. Sociedade & Natureza, v. 32, p. 439-456, 15 jul. 2020. Título em inglês: Precipitation in northern Amazonia: Spatial distribution in Roraima, Brazil.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Roraima. |
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| 10. | | ZICCARDI, L. G.; GRAÇA, P. M. L. de A.; FIGUEIREDO, E. O.; YANAI, A. M.; FEARNSIDE, P. M. Community composition of tree and palm species following disturbance in a forest with bamboo in southwestern Amazonia, Brazil. Biotropica, v. 53, n. 5, p. 1328-1341, Sept. 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
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| 11. | | FIGUEIREDO, E. O.; OLIVEIRA, M. V. N. d'; FEARNSIDE, P. M.; BRAZ, E. M.; PAPA, D. de A. Equations to estimate tree gaps in a precision forest management area the Amazon based on crown morphometry. Revista Árvore, Viçosa, v. 41, n. 3, e410313, 2017.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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| 14. | | MARQUES, J. D. de O.; LUIZÃO, F. J.; TEIXEIRA, W. G.; NOGUEIRA, E. M.; FEARNSIDE, P. M.; SARRAZIN, M. Soil carbon stocks under amazonian forest: distribution in the soil fractions and vulnerability to emission. Open Journal of Forestry, v. 7, n. 2, p. 121-142, Apr. 2017.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 5 |
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| 16. | | VASCONCELOS, S. S. de; FEARNSIDE, P. M.; GRAÇA, P. M. L. de A.; NOGUEIRA, E. M.; OLIVEIRA, L. C. de; FIGUEIREDO, E. O. Forest fires in southwestern Brazilian Amazonia: estimates of area and potential carbon emissions. Forest Ecology and Management, Amsterdam, v. 291, p. 199-208, Mar. 2013.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Acre. |
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| Registros recuperados : 41 | |
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