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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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Embrapa Florestas (CNPF) |
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| 1. |  | OLIVEIRA, D. M. de; VIDEIRA, S. S.; BONILLA, G. E.; BARROS, D. dos REIS; BALDANI, V. L. D. Diversidade funcional de bactérias diazotróficas isoladas de capim-elefante In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 29.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 13.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 11.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 8., 2010, Guarapari. Fontes de nutrientes e produção agrícola: modelando o futuro: anais. Viçosa: SBCS, 2010. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
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