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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: |
26/06/2013 |
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Data da última atualização: |
07/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
IVANOV, V. Y.; HUTYRA, L. R.; WOFSY, S.; MUNGER, J. W.; SALESKA, S. R.; OLIVEIRA JUNIOR, R. C. de; CAMARGO, P. B. de. |
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Afiliação: |
Valeriy Y. Ivanov, University of Michigan / Harvard University; Lucy R. Hutyra, Harvard University / Boston University; Steven C. Wofsy, Harvard University; J. William Munger, Harvard University; Scott R. Saleska, University of Arizona; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; Plínio B. de Camargo, USP. |
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Título: |
Root niche separation can explain avoidance of seasonal drought stress and vulnerability of overstory trees to extended drought in a mature Amazonian forest. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Water Resources Research, v. 48, n. 12, p. 1-21, Dec. 2012. |
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DOI: |
10.1029/2012WR011972 |
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Idioma: |
Inglês |
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Conteúdo: |
Large areas of Amazonian evergreen forest experience seasonal droughts extending for three or more months, yet show maximum rates of photosynthesis and evapotranspiration during dry intervals. This apparent resilience is belied by disproportionate mortality of the large trees in manipulations that reduce wet season rainfall, occurring after 2?3 years of treatment. The goal of this study is to characterize the mechanisms that produce these contrasting ecosystem responses. A mechanistic model is developed based on the ecohydrological framework of TIN (Triangulated Irregular Network)-based Real Time Integrated Basin Simulator + Vegetation Generator for Interactive Evolution (tRIBS+VEGGIE). The model is used to test the roles of deep roots and soil capillary flux to provide water to the forest during the dry season. Also examined is the importance of ?root niche separation,? in which roots of overstory trees extend to depth, where during the dry season they use water stored from wet season precipitation, while roots of understory trees are concentrated in shallow layers that access dry season precipitation directly. Observational data from the Tapajós National Forest, Brazil, were used as meteorological forcing and provided comprehensive observational constraints on the model. Results strongly suggest that deep roots with root niche separation adaptations explain both the observed resilience during seasonal drought and the vulnerability of canopy-dominant trees to extended deficits of wet season rainfall. These mechanisms appear to provide an adaptive strategy that enhances productivity of the largest trees in the face of their disproportionate heat loads and water demand in the dry season. A sensitivity analysis exploring how wet season rainfall affects the stability of the rainforest system is presented. MenosLarge areas of Amazonian evergreen forest experience seasonal droughts extending for three or more months, yet show maximum rates of photosynthesis and evapotranspiration during dry intervals. This apparent resilience is belied by disproportionate mortality of the large trees in manipulations that reduce wet season rainfall, occurring after 2?3 years of treatment. The goal of this study is to characterize the mechanisms that produce these contrasting ecosystem responses. A mechanistic model is developed based on the ecohydrological framework of TIN (Triangulated Irregular Network)-based Real Time Integrated Basin Simulator + Vegetation Generator for Interactive Evolution (tRIBS+VEGGIE). The model is used to test the roles of deep roots and soil capillary flux to provide water to the forest during the dry season. Also examined is the importance of ?root niche separation,? in which roots of overstory trees extend to depth, where during the dry season they use water stored from wet season precipitation, while roots of understory trees are concentrated in shallow layers that access dry season precipitation directly. Observational data from the Tapajós National Forest, Brazil, were used as meteorological forcing and provided comprehensive observational constraints on the model. Results strongly suggest that deep roots with root niche separation adaptations explain both the observed resilience during seasonal drought and the vulnerability of canopy-dominant trees to extended defic... Mostrar Tudo |
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Palavras-Chave: |
Ecohidrologia; Estresse hídrico. |
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Thesagro: |
Floresta Tropical; Seca. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02651naa a2200253 a 4500
001 1960641
005 2022-11-07
008 2012 bl uuuu u00u1 u #d
024 7 $a10.1029/2012WR011972$2DOI
100 1 $aIVANOV, V. Y.
245 $aRoot niche separation can explain avoidance of seasonal drought stress and vulnerability of overstory trees to extended drought in a mature Amazonian forest.$h[electronic resource]
260 $c2012
520 $aLarge areas of Amazonian evergreen forest experience seasonal droughts extending for three or more months, yet show maximum rates of photosynthesis and evapotranspiration during dry intervals. This apparent resilience is belied by disproportionate mortality of the large trees in manipulations that reduce wet season rainfall, occurring after 2?3 years of treatment. The goal of this study is to characterize the mechanisms that produce these contrasting ecosystem responses. A mechanistic model is developed based on the ecohydrological framework of TIN (Triangulated Irregular Network)-based Real Time Integrated Basin Simulator + Vegetation Generator for Interactive Evolution (tRIBS+VEGGIE). The model is used to test the roles of deep roots and soil capillary flux to provide water to the forest during the dry season. Also examined is the importance of ?root niche separation,? in which roots of overstory trees extend to depth, where during the dry season they use water stored from wet season precipitation, while roots of understory trees are concentrated in shallow layers that access dry season precipitation directly. Observational data from the Tapajós National Forest, Brazil, were used as meteorological forcing and provided comprehensive observational constraints on the model. Results strongly suggest that deep roots with root niche separation adaptations explain both the observed resilience during seasonal drought and the vulnerability of canopy-dominant trees to extended deficits of wet season rainfall. These mechanisms appear to provide an adaptive strategy that enhances productivity of the largest trees in the face of their disproportionate heat loads and water demand in the dry season. A sensitivity analysis exploring how wet season rainfall affects the stability of the rainforest system is presented.
650 $aFloresta Tropical
650 $aSeca
653 $aEcohidrologia
653 $aEstresse hídrico
700 1 $aHUTYRA, L. R.
700 1 $aWOFSY, S.
700 1 $aMUNGER, J. W.
700 1 $aSALESKA, S. R.
700 1 $aOLIVEIRA JUNIOR, R. C. de
700 1 $aCAMARGO, P. B. de
773 $tWater Resources Research$gv. 48, n. 12, p. 1-21, Dec. 2012.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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| Registros recuperados : 62 | |
| 9. |  | GALVANI, D. B.; PIRES, C. C.; HÜBNER, C. H.; CARVALHO, S.; WOMMER, T. P. Growth performance and carcass traits of early-weaned lambs as affected by the nutritional regimen of lactating ewes. Small Ruminant Research, Amsterdam, v. 120, n. 1, p. 1-5, Jul. 2014.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 11. | | MAGALHÃES, Y. A.; GALVANI, D. B.; MACHADO, H. C.; SANTOS, S. F.; SANTOS, V. O.; SOUSA, Y. H. L. Produção de metano decorrente da fermentação in vitro de leguminosas nativas do bioma caatinga. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA CAPRINOS E OVINOS, 4., 2015, Sobral. Anais... Sobral: Embrapa Caprinos e Ovinos, 2015. p. 36-37.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
|  |
| 12. | | FONTELES, N. L. de; BOMFIM, M. A. D.; GALVANI, D. B.; FACO, O.; OLIVEIRA, L. S.; LIMA, R. S. Produção e composição físico-quimíco do leite de cabras Saanen alimentadas com pedúnculo de caju (Anacardium occidentale l.) e níveis crescentes de óleo de soja. In: ENCONTRO DE PESQUISA E PÓS-GRADUAÇÃO DA UNIVERSIDADE ESTADUAL VALE DO ACARAÚ, 6., 2011, Sobral. [Anais...]. Sobral: UVA, 2011. 5 f.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 15. | | GALVANI, D. B.; PIRES, A. V.; SUSIN, I.; GOUVÊA, V. N.; BERNDT, A.; ABDALLA, A. L.; TEDESCHI, L. O. Net protein requirements and metabolizable protein use for growing ram lambs fed diets differing in concentrate level and roughage source. Small Ruminant Research, v. 165, n. 79-86, Aug. 2018.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Caprinos e Ovinos; Embrapa Pecuária Sudeste. |
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| 16. | | MARTINS, T. P.; GALVANI, D. B.; MARTINS, F. E. B.; NASCIMENTO FILHO, F. R. do; SOUZA, A. L. M. Efeito da qualidade do volumoso sobre a produção de metano durante a fermentação ruminal. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA CAPRINOS E OVINOS, 2., 2013, Sobral. Resumos... Sobral: Embrapa Caprinos e Ovinos, 2013. p. 36-37. (Embrapa Caprinos e Ovinos. Documentos, 109).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 17. | | GONÇALVES, J. de L.; BOMFIM, M. A. D.; TEDESCHI, L. O.; GALVANI, D. B.; SOUSA, R. T. de; ALBUQUERQUE, F. H. M. A. R. de. Balanços de energia e proteína metabolizável de ovelhas em pastagem de capim-tanzânia. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 8., 2013, Fortaleza. [Anais...]. [Sobral: Universidade Estadual Vale do Acaraú; Embrapa Caprinos e Ovinos, 2013]. 4 f.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 18. | | SANTOS, M. de F. N. dos; LIMA, B. S. L. de; LIMA, A. C. A. de; GALVANI, D. B.; DINIZ, F. M.; BUENO, L. G. Altura de plantas e densidade populacional de perfilhos em genótipos de Andropogon gayanus em região semiárida. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA CAPRINOS E OVINOS, 9., 2020, Sobral. Anais... Sobral: Embrapa Caprinos e Ovinos, 2021. p. 19-20. Embrapa Caprinos e Ovinos. Documentos, 140).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 19. | | FONTELES, N. L. de O.; BOMFIM, M. A. D.; GALVANI, D. B.; OLIVEIRA, L. S.; SANTOS, S. F. dos; SOUSA, R. T. de. Balanço de nitrogênio de cabras alimentadas com pedúnculo de caju e níveis crescentes de óleo de soja. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 8., 2013, Fortaleza. [Anais...]. [Sobral: Universidade Estadual Vale do Acaraú; Embrapa Caprinos e Ovinos, 2013]. 4 f.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 20. | | MAGALHÃES, Y. A.; MARTINS, F. E. B.; BOMFIM, M. A. D.; MACHADO, H. C.; SANTOS, S. F. dos; GALVANI, D. B.; COSTA, B. M.; SILVA, B. K. G. Avaliação do desempenho de modelos para a previsão da digestibilidade de dieta de caprinos em pasto nativo usando a espectroscopia NIR. Arquivos Latinoamericanos de Produção Animal, v. 24, supl. 1, p. 422-423, 2016. Resumo 93-2. Edición de las Memorias de la 25a. Reunión de la Asociación Latinoamericana de Producción Animal (ALPA), 2016, Recife, Brasil.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| Registros recuperados : 62 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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