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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: |
16/10/2018 |
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Data da última atualização: |
19/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FU, Z.; GERKEN, T.; BROMLEY, G.; ARAUJO, A. C. de; BONAL, D.; BURBAN, B.; FICKLIN, D.; FUENTES, J. D.; GOULDEN, M.; HIRANO, T.; KOSUGI, Y.; LIDDELL, M.; NICOLINI, G.; NIU, S.; ROUPSARD, O.; STEFANI, P.; MI, C.; TOFTE, Z.; XIAO, J.; VALENTINI, R.; WOLF, S.; STOY, P. C. |
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Afiliação: |
Zheng Fu, Montana State University / Chinese Academy of Sciences / University of Chinese Academy of Sciences; Tobias Gerken, Montana State University; Gabriel Bromley, Montana State University; ALESSANDRO CARIOCA DE ARAUJO, CPATU; Damien Bonal, Université de Lorraine; Benoît Burban, INRA; Darren Ficklin, Indiana University; Jose D. Fuentes, The Pennsylvania State University; Michael Goulden, University of California; Takashi Hirano, Hokkaido University; Yoshiko Kosugi, Kyoto University; Michael Liddell, James Cook University / James Cook University; Giacomo Nicolini, University of Tuscia / Euro-Mediterranean Center on Climate Change; Shuli Niu, Chinese Academy of Sciences; Olivier Roupsard, CIRAD / CATIE; Paolo Stefani, University of Tuscia; Chunrong Mi, University of Chinese Academy of Sciences; Zaddy Tofte, Montana State University; Jingfeng Xiao, University of New Hampshire; Riccardo Valentini, University of Tuscia / Euro-Mediterranean Center on Climate Change; Sebastian Wolf, ETH Zurich; Paul C. Stoy, Montana State University. |
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Título: |
The surface-atmosphere exchange of carbon dioxide in tropical rainforests: sensitivity to environmental drivers and flux measurement methodology. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Agricultural and Forest Meteorology, v. 263, p. 292-307, Dec. 2018. |
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DOI: |
10.1016/j.agrformet.2018.09.001 |
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Idioma: |
Inglês |
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Conteúdo: |
Tropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP3000g C m-2 y-1) have the lowest net carbon uptake ? or even carbon losses ? versus other study ecosystems because RE is of a similar magnitude. Sites that provided subcanopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87umol CO2 m-2 s-1 hPa-1. Climate projections from 13 general circulation models (CMIP5) under the representative concentration pathway that generates 8.5W m-2 of radiative forcing suggest that many current tropical rainforest sites on the lower end of the current temperature range are likely to reach a climate space similar to present-day warmer sites by the year 2050, warmer sites will reach a climate not currently experienced, and all forests are likely to experience higher VPD. Results demonstrate the need to quantify if and how mature tropical trees acclimate to heat and water stress, and to further develop flux-partitioning and gap-filling algorithms for defensible estimates of carbon exchange in tropical rainforests. MenosTropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP3000g C m-2 y-1) have the lowest net carbon uptake ? or even carbon losses ? versus other study ecosystems because RE is of a similar magnitude. Sites that provided subcanopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87umo... Mostrar Tudo |
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Palavras-Chave: |
Respiração do ecossistema; Variabilidade climática. |
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Thesagro: |
Dióxido de Carbono; Floresta Tropical. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 03464naa a2200433 a 4500
001 2097454
005 2022-05-19
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1016/j.agrformet.2018.09.001$2DOI
100 1 $aFU, Z.
245 $aThe surface-atmosphere exchange of carbon dioxide in tropical rainforests$bsensitivity to environmental drivers and flux measurement methodology.$h[electronic resource]
260 $c2018
520 $aTropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP3000g C m-2 y-1) have the lowest net carbon uptake ? or even carbon losses ? versus other study ecosystems because RE is of a similar magnitude. Sites that provided subcanopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87umol CO2 m-2 s-1 hPa-1. Climate projections from 13 general circulation models (CMIP5) under the representative concentration pathway that generates 8.5W m-2 of radiative forcing suggest that many current tropical rainforest sites on the lower end of the current temperature range are likely to reach a climate space similar to present-day warmer sites by the year 2050, warmer sites will reach a climate not currently experienced, and all forests are likely to experience higher VPD. Results demonstrate the need to quantify if and how mature tropical trees acclimate to heat and water stress, and to further develop flux-partitioning and gap-filling algorithms for defensible estimates of carbon exchange in tropical rainforests.
650 $aDióxido de Carbono
650 $aFloresta Tropical
653 $aRespiração do ecossistema
653 $aVariabilidade climática
700 1 $aGERKEN, T.
700 1 $aBROMLEY, G.
700 1 $aARAUJO, A. C. de
700 1 $aBONAL, D.
700 1 $aBURBAN, B.
700 1 $aFICKLIN, D.
700 1 $aFUENTES, J. D.
700 1 $aGOULDEN, M.
700 1 $aHIRANO, T.
700 1 $aKOSUGI, Y.
700 1 $aLIDDELL, M.
700 1 $aNICOLINI, G.
700 1 $aNIU, S.
700 1 $aROUPSARD, O.
700 1 $aSTEFANI, P.
700 1 $aMI, C.
700 1 $aTOFTE, Z.
700 1 $aXIAO, J.
700 1 $aVALENTINI, R.
700 1 $aWOLF, S.
700 1 $aSTOY, P. C.
773 $tAgricultural and Forest Meteorology$gv. 263, p. 292-307, Dec. 2018.
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Embrapa Amazônia Oriental (CPATU) |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
18/06/1997 |
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Data da última atualização: |
07/08/2019 |
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Autoria: |
ARAUJO, W. F.; FERREIRA, L. G. R. |
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Afiliação: |
WELLINGTON FARIAS ARAÚJO, Universidade Federal de Roraima - UFRR; LUIZ GONZAGA REBOUÇAS FERREIRA, Universidade Federal do Ceará - UFC. |
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Título: |
Efeito do déficit hídrico durante diferentes estádios do amendoim. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 32, n. 5, p. 481-484, maio 1997. |
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Idioma: |
Português |
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Notas: |
Título em inglês: Effect of water stress during different stages of peanut. |
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Conteúdo: |
Experimentos de campo foram conduzidos durante a estacao seca com amendoim( Arachis hypogaea L.) cv. PI-165.317, objetivando encontrar na cultivar quais os mecanismos fisiologicos e de producao alterados com o estabelecimento de periodo de deficit hidrico em diferentes fases do ciclo vital. Usou-se o delineamento de blocos casualizados, com quatro tratamentos e quatro repeticoes. O tratamento-controle (III) era irrigado pelo sistema de tubos janelados, sempre que o potencial matricial do solo na profundidade de 15 cm atingia 0,05 MPa. Os demais tratamentos atendiam a esse mesmo criterio, exceto durante o periodo de estresse, a saber: IEI, 30 a 60 dias apos a emergencia (DAE), IIE, 60 a 90 DAE, e IEE, 30 a 90 DAE. Nao foram observadas diferencas significativas no potencial hidrico foliar entre os diversos tratamentos. Os valores de area foliar, peso seco da parte aerea, peso seco da raiz, relacao raiz/parte aerea, e a producao, foram significativamente alterados entre os tratamentos. |
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Palavras-Chave: |
Dry weight; Estresse hidrico; Peso seco. |
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Thesagro: |
Amendoim; Arachis Hypogaea; Irrigação. |
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Thesaurus NAL: |
irrigation; water stress. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/5947/1/pab97_04_maio.pdf
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Marc: |
LEADER 01732naa a2200241 a 4500
001 1089519
005 2019-08-07
008 1997 bl uuuu u00u1 u #d
100 1 $aARAUJO, W. F.
245 $aEfeito do déficit hídrico durante diferentes estádios do amendoim.
260 $c1997
500 $aTítulo em inglês: Effect of water stress during different stages of peanut.
520 $aExperimentos de campo foram conduzidos durante a estacao seca com amendoim( Arachis hypogaea L.) cv. PI-165.317, objetivando encontrar na cultivar quais os mecanismos fisiologicos e de producao alterados com o estabelecimento de periodo de deficit hidrico em diferentes fases do ciclo vital. Usou-se o delineamento de blocos casualizados, com quatro tratamentos e quatro repeticoes. O tratamento-controle (III) era irrigado pelo sistema de tubos janelados, sempre que o potencial matricial do solo na profundidade de 15 cm atingia 0,05 MPa. Os demais tratamentos atendiam a esse mesmo criterio, exceto durante o periodo de estresse, a saber: IEI, 30 a 60 dias apos a emergencia (DAE), IIE, 60 a 90 DAE, e IEE, 30 a 90 DAE. Nao foram observadas diferencas significativas no potencial hidrico foliar entre os diversos tratamentos. Os valores de area foliar, peso seco da parte aerea, peso seco da raiz, relacao raiz/parte aerea, e a producao, foram significativamente alterados entre os tratamentos.
650 $airrigation
650 $awater stress
650 $aAmendoim
650 $aArachis Hypogaea
650 $aIrrigação
653 $aDry weight
653 $aEstresse hidrico
653 $aPeso seco
700 1 $aFERREIRA, L. G. R.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 32, n. 5, p. 481-484, maio 1997.
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