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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
26/09/2006 |
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Data da última atualização: |
27/05/2024 |
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Autoria: |
KUULUVANEN, T.; PUKKALA, T. |
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Título: |
Simulation of within-tree and between-tree shading of direct radiation in a forest canopy: effect of crown shape and elevation. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Ecological Modelling, Amsterdam, v. 49, n. 1-2, p. 89-100, 1989. |
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Idioma: |
Inglês |
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Conteúdo: |
The pattern of momentary within-tree and between-tree shading of foliage in direct radiation flux was simulated in fully-stocked model stands with a Poisson distribution of trees. The canopies were composed of umbrella-like (crown height/crown radius, H:R=3), average (H:R=8) or columnar (H:R=20) tree crowns. The momentary radiation-extinction probability was calculated for a large number of points (106-107 points per hectare) within the canopy. The radiation attenuation rate depended on the projected leaf-area density within the crown. At solar elevations of 50 and 450, columnar crowns had the most between-tree and the least within-tree shading, while at a high sun elevation (850) the same was true for umbrella-like crowns. At low and medium sun elevations (50 and 450), crown shape had a small effect on the total shading of foliage. At a high sun elevation, flat, horizontally extended crowns were the best illuminated, as within-tree and between-tree shadings were both low. |
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Palavras-Chave: |
Crown; Light penetration; Simulation. |
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Thesaurus Nal: |
canopy; dimensions; light; solar radiation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01641naa a2200217 a 4500
001 1278727
005 2024-05-27
008 1989 bl uuuu u00u1 u #d
100 1 $aKUULUVANEN, T.
245 $aSimulation of within-tree and between-tree shading of direct radiation in a forest canopy$beffect of crown shape and elevation.$h[electronic resource]
260 $c1989
520 $aThe pattern of momentary within-tree and between-tree shading of foliage in direct radiation flux was simulated in fully-stocked model stands with a Poisson distribution of trees. The canopies were composed of umbrella-like (crown height/crown radius, H:R=3), average (H:R=8) or columnar (H:R=20) tree crowns. The momentary radiation-extinction probability was calculated for a large number of points (106-107 points per hectare) within the canopy. The radiation attenuation rate depended on the projected leaf-area density within the crown. At solar elevations of 50 and 450, columnar crowns had the most between-tree and the least within-tree shading, while at a high sun elevation (850) the same was true for umbrella-like crowns. At low and medium sun elevations (50 and 450), crown shape had a small effect on the total shading of foliage. At a high sun elevation, flat, horizontally extended crowns were the best illuminated, as within-tree and between-tree shadings were both low.
650 $acanopy
650 $adimensions
650 $alight
650 $asolar radiation
653 $aCrown
653 $aLight penetration
653 $aSimulation
700 1 $aPUKKALA, T.
773 $tEcological Modelling, Amsterdam$gv. 49, n. 1-2, p. 89-100, 1989.
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| 1. |  | RAMOS JUNIOR, E. U.; RAMOS, E. M. Desempenho do milho segunda safra e da soja em sucessão influenciado pela densidade de crotalaria spectabilis em consórcio com o milho. In: REUNIÃO DE PESQUISA DE SOJA, 36., 2017, Londrina, PR. Resumos expandidos... Londrina: Embrapa Soja, 2017. p. 33-35. (Embrapa Soja. Documentos, 388). Editado por Alvadi Antonio Balbinot Junior, Fernando Augusto Henning, Regina Maria Villas Bôas de Campos Leite.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 4. | | RAMOS JUNIOR, E. U.; KONZEN, L. M.; RAMOS, E. M. de; BULHÕES, C. C. Componentes de produção e produtividade de grãos de soja em função da densidade de plantas. In: ENCONTRO DE CIÊNCIA E TECNOLOGIAS AGROSSUSTENTÁVEIS; JORNADA CIENTÍFICA DA EMBRAPA AGROSSILVIPASTORIL, 6., 2017, Sinop, MT. Resumos... Sinop, MT: Embrapa Agrossilpastoril, 2017. p. 13-17.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 9. | | RAMOS JUNIOR, E. U.; RAMOS, E. M. de; KONZEN, L. M.; FALEIRO, V. de O.; SILVA, A. F. da; TARDIN, F. D. Desempenho da soja em sucessão ao consórcio de milho segunda safra com diferentes densidades de Crotalaria spectabilis. Nativa, v. 7, n. 6, p. 649-655, nov./dez. 2019.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
| Biblioteca(s): Embrapa Agrossilvipastoril; Embrapa Milho e Sorgo; Embrapa Soja. |
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| Registros recuperados : 9 | |
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