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| Registros recuperados: 19 | |
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| Do, Frédéric; Winkel, Thierry; Cournac, L.; Louguet, P.. |
| Although millet is known to be adapted to very dry conditions, little is known about its canopy water relations. The control of water loss and dehydration tolerance were studied during the grain filling for two cultivars presumed resistant and sensitive to moisture deficit at this stage. Two experiments were conducted in the dry hot season at Niamey, using crops based on the traditional system of hill sowing at low density : a preliminary trial with low leaf area (index of 0.7 at flowering) ; and a main trial with higher leaf area (index of 1.8) induced by tillering where parameters were recorded at a short time scale. The preliminary trial with small initial leaf area revealed a less apparent leaf water deficit according to leaf water potential and... |
| Tipo: Text |
Palavras-chave: PHYSIOLOGIE VEGETALE; CULTIVAR; DEFICIT HYDRIQUE; EVAPOTRANSPIRATION; CANOPEE. |
| Ano: 1996 |
URL: http://www.documentation.ird.fr/hor/fdi:010011032 |
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| Sinoquet, H.; Sonohat, G.; Lauri, P.E.; Monney, P.; Potel, A.. |
| Training in fruit trees is aimed at improving light distribution within the tree canopy, because this is expected to improve fruit quality, namely homogenise the distribution of fruit quality parameters. Adult apple trees trained with one, two or three main axes (central leader, Ycare and Drilling, respectively) were 3D-digitised at the leafy shoot scale in 2004 and 2005 in Valais, Switzerland. Fruiting and vegetative shoots were distinguished. The digitising datasets were combined with information at the leaf scale in order to make 3D computer plants. Images of the 3D plants were used to compute the light distribution at the fruiting shoot scale within the tree. Fruit quality parameters like diameter and sugar content were measured on a sample of fruits... |
| Tipo: Conference Paper |
Palavras-chave: DIGITALISATION; MAQUETTE 3-D; CANOPEE; LUMIERE. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20082fae8f8a&uri=/notices/prodinra1/2009/01/ |
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| Read, J.; Hope, G.S.; Gaudrie, E.; Jaffré, Tanguy; Veillon, Jean-Marie. |
| Permanent plots are being established in monodominant and mixed rainforests over a range of altitudes on ultramafic soils in New Caledonia to investigate the factors determining canopy richness. Initial studies are examining the dynamics of the major tree species to assess the role of disturbance and successional change in controlling the canopy richness of these stands. The monodominant stands being investigated are dominated by #Nothofagus$ spp. and have a high species richness in the understorey, despite the low richness of the upper canopy. Many of the species recorded in the understorey, are potentially capable of reaching the canopy, including species that typically occur in the canopy of nearby mixed rainforests. However, the dominant canopy species... |
| Tipo: Text |
Palavras-chave: FORET DENSE; ROCHE ULTRABASIQUE; CANOPEE; DYNAMIQUE DE POPULATION; STRUCTURE DU PEUPLEMENT. |
| Ano: 1995 |
URL: http://www.documentation.ird.fr/hor/fdi:010005650 |
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| Leroy, C.; Sabatier, S.; Wahyuni, N. S.; Barczi, J.F.; Dauzat, J.; Laurans, M.; Auclair, D.. |
| In agroforestry systems, the distribution of light transmitted under tree canopies can be a limiting factor for the development of intercrops. The light available for intercrops depends on the quantity of light intercepted by tree canopies and, consequently, on the architecture of the tree species present. The influence of tree architecture on light transmission was analysed using dynamic 3D architectural models. The architectural analysis of Acacia mangium and Tectona grandis was performed in Indonesian agroforestry systems with trees aged from 1 to 3 years. 3D virtual trees were then generated with the AmapSim simulation software and 3D virtual experiments in which tree age, planting density, planting pattern and pruning intensity varied were... |
| Tipo: Journal Article |
Palavras-chave: INTERCEPTION LUMINEUSE; MAQUETTE 3D; CANOPEE; EXPERIMENTATION VIRTUELLE ACACIA MANGIUM; TECTONA GRANDIS; LIGHT INTERCEPTION; PLANT ARCHITECTURE; 3D VIRTUAL PLANT; SIMULATION. |
| Ano: 2009 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009106da4a6&uri=/notices/prodinra1/2010/09/ |
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| N'Guettia, R.Y.; Dea, B.G.; Fargette, Denis; Fauquet, Claude; Fishpool, L.. |
| La vitesse et la direction du vent sont deux facteurs qui affectent la dispersion de la mosaïque africaine du manioc. Une étude a été conduite au champ de 1986 à 1988 pour déterminer l'importance de la hauteur des plantes et l'architecture du feuillage sur la réduction de la vitesse du vent au dessus et dans le couvert du manioc. Les profils verticaux ont une forme logarithmique au-dessus de la canopée alors qu'à l'intérieur du couvert, la forme dépend de la hauteur (H) des plantes, de l'indice foliaire (LAI) et de la distribution de la surface foliaire. La réduction de la vitesse du vent par le couvert de manioc augmente avec la force du vent et peut atteindre 50% à 0,2 H au-dessus de la canopée. Les profils horizontaux montrent que la réduction de la... |
| Tipo: Text |
Palavras-chave: VENT; VITESSE; CANOPEE; PROFIL VERTICAL; COUVERT VEGETAL; INDICE FOLIAIRE; PROFIL HORIZONTAL. |
| Ano: 1996 |
URL: http://www.documentation.ird.fr/hor/fdi:010008060 |
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| Registros recuperados: 19 | |
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