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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
12/03/1999 |
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Data da última atualização: |
26/09/2013 |
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Autoria: |
SORIANO, A.; SALA, O. |
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Afiliação: |
Departamento de Ecologia, Facultad de Agronomia, Universidad de Buenos Aires and PROSAG (CONICET) Argentina. |
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Título: |
Ecological strategies in a Patagonian arid steppe. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Vegetatio, v.56, n.1, p.9-15, 1983. |
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Idioma: |
Inglês |
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Conteúdo: |
The vegetation in the Coironal arid steppe consists of grasses and shrubs. The objective of this paper was to test Walter's hypothesis that woody vegetation and grasses compete for water in the soil, but woody vegetation has exclusive access to a source of water at deeper levels. Analysis of root profiles and patterns of leaf and soil water potential led us to accept the hypothesis for this arid steppe. Additional information on phenology and on the ability of the major grass species to respond to watering permitted to identify two ecological strategies corresponding to grasses and shrubs. Grasses behave as opportunists having always leaves ready to grow as soon as water becomes available. They have as shallow root system and are able to respond very rapidly to increases in soil water availability. In contrast, woody species have a clear-cut periodic pattern of growth and dormancy. They posses thick horizontal roots running below 35-40 cm and utilized water stored in lower layers of the soil. A diagrammatic model summarizes the role of periodic and opportunistic species upon water circulation in the ecosystem. The effect of changes in the proportion of the two groups upon water dynamics is also discussed. |
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Palavras-Chave: |
Arid steppe; Competicao; Competition; Ecological strategy; Estepe arida; Estrategia ecologica; Forma de vida; Life form; Patagonia; Relacao com agua; Root system; Sistema de raiz; Water relations. |
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Categoria do assunto: |
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Marc: |
LEADER 01948naa a2200289 a 4500
001 1794214
005 2013-09-26
008 1983 bl --- 0-- u #d
100 1 $aSORIANO, A.
245 $aEcological strategies in a Patagonian arid steppe.
260 $c1983
520 $aThe vegetation in the Coironal arid steppe consists of grasses and shrubs. The objective of this paper was to test Walter's hypothesis that woody vegetation and grasses compete for water in the soil, but woody vegetation has exclusive access to a source of water at deeper levels. Analysis of root profiles and patterns of leaf and soil water potential led us to accept the hypothesis for this arid steppe. Additional information on phenology and on the ability of the major grass species to respond to watering permitted to identify two ecological strategies corresponding to grasses and shrubs. Grasses behave as opportunists having always leaves ready to grow as soon as water becomes available. They have as shallow root system and are able to respond very rapidly to increases in soil water availability. In contrast, woody species have a clear-cut periodic pattern of growth and dormancy. They posses thick horizontal roots running below 35-40 cm and utilized water stored in lower layers of the soil. A diagrammatic model summarizes the role of periodic and opportunistic species upon water circulation in the ecosystem. The effect of changes in the proportion of the two groups upon water dynamics is also discussed.
653 $aArid steppe
653 $aCompeticao
653 $aCompetition
653 $aEcological strategy
653 $aEstepe arida
653 $aEstrategia ecologica
653 $aForma de vida
653 $aLife form
653 $aPatagonia
653 $aRelacao com agua
653 $aRoot system
653 $aSistema de raiz
653 $aWater relations
700 1 $aSALA, O.
773 $tVegetatio$gv.56, n.1, p.9-15, 1983.
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Registro original: |
Embrapa Pantanal (CPAP) |
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| Registros recuperados : 3 | |
| 1. |  | TAKETANI, N.; TAKETANI, R. G.; MELO, I. S. de; RIZZO, A. C. L.; SORIANO, A. U.; LEITE, S. G. F.; CUNHA, C. D. Influence of nickel in petroleum biodegradation: a metagenomics approach. In: INTERNATIONAL SYMPOSIUM ON MICROBIAL ECOLOGY, 15., 2014, Seoul. Proceedings... Wageningen: The International Society for Microbial Ecology (ISME), 2014. p. 606-607.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 2. | | FALAVIGNA, V. da S.; GUITTON, B.; AHIER, C.; FARRERA, I.; KELNER, J. J.; SORIANO, A.; PEREIRA, C. S.; ARENHART, R. A.; SARTOR, T.; BUFFON, V.; PASQUALI, G.; REVERS, L. F.; COSTES, E.; ANDRÉS, F. Genetic and molecular characterization of bud dormancy in apple: deciphering candidate gene roles in dormancy regulation. In: WORKSHOP ON MOLECULAR MECHANISMS CONTROLLING FLOWER DEVELOPMENT, Padua, Italy, 3-7 September 2017. Session 1 - Floral Transition - Resumo 08.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| 3. | | FALAVIGNA, V. da S.; GUITTON, B.; SORIANO, A.; BUFFON, V.; SILVEIRA, C. P.; ARENHART, R. A.; SARTORI, T.; AHIER, C.; FERREIRA, I.; KELNER, J. J.; PASQUALI, G.; REVERS, L. F.; COSTES, E.; ANDRÉS, F. Molecular and genetic characterization of dormancy-associated and flowering-time related MADS-box transcription factors in apple. In: INTEGRATIVE PLANT BIOLOGY: THE DEVELOPING PLANT IN ITS ENVIRONMENT, Domaine Lyon Saint-Joseph, Sainte-Foy-Lès-Lyon, 23 to October 25, 2017.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| Registros recuperados : 3 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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