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Foliage randomness and light interception in 3-D digitized trees: an analysis from multiscale discretization of the canopy Inra
Sinoquet, H.; Sonohat, G.; Phattaralerphong, J.; Godin, C..
Light models for vegetation canopies based on the turbid medium analogy are usually limited by the basic assumption of random foliage dispersion in the canopy space. The objective of this paper was to assess the effect of three possible sources of non-randomness in tree canopies on light interception properties. For this purpose, four three-dimensional (3-D) digitized trees and four theoretical canopies - one random and three built from fractal rules - were used to compute canopy structure parameters and light interception, namely the sky-vault averaged STAR (Silhouette to Total Area Ratio). STAR values were computed from (1) images of the 3-D plants, and (2) from a 3-D turbid medium model using space discretization at different scales. For all trees,...
Tipo: Journal Article Palavras-chave: PLANTE VIRTUELLE; INTERCEPTION DE LA LUMIERE; NUMERISATION TRIDIMENSIONNELLE 3-D DIGITIZING; CLUMPING; FRACTALS; LEAF DISPERSION; LIGHT INTERCEPTION; TREE CANOPY; VIRTUAL PLANTS.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20077a5e091&uri=/notices/prodinra1/2008/08/
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Integrating knowledge of tree biology and physiology into models of fruit tree development: a review Inra
Costes, E..
In the last decade, the consideration of fruit production as part of the entire tree development has become a new agronomic challenge, particularly with the emerging concept of the Integrated Fruit Production. This necessitates more consideration of the complexity of fruit tree biology with respect to perenniality and the year-on-year increase of tree structure. This has been made possible thanks to the development of methods used to describe and analyse entire tree structures. Over the same period, physiological processes have been investigated at a far more detailed level, thanks to progress made in cellular and molecular biology. These developments have prompted a new scientific question: how can knowledge acquired at the tree, organ, cellular or...
Tipo: Conference Paper Palavras-chave: INTERCEPTION LUMINEUSE; CYCLE DE LA PLANTE; ARBORESCENCE; RAMIFICATION STRUCTURE-FUNCTION MODELS; PLANT ARCHITECTURE; LIGHT INTERCEPTION; CARBON ALLOCATION; WATER FLUX; BIOMECHANICS.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008fa92adab&uri=/notices/prodinra1/2008/12/
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Simple equations to estimate light interception by isolated trees from canopy structure features: assessment with three-dimensional digitized apple trees Inra
Sinoquet, H.; Stephan, J.; Sonohat, G.; Lauri, P.E.; Monney, P..
Simple models of light interception are useful to identify the key structural parameters involved in light capture. We developed such models for isolated trees and tested them with virtual experiments. Light interception was decomposed into the projection of the crown envelope and the crown porosity. The latter was related to tree structure parameters.Virtual experiments were conducted with three-dimensional (3-D) digitized apple trees grown in Lebanon and Switzerland, with different cultivars and training. The digitized trees allowed actual values of canopy structure (total leaf area, crown volume, foliage inclination angle, variance of leaf area density) and light interception properties (projected leaf area, silhouette to total area ratio, porosity,...
Tipo: Journal Article Palavras-chave: INTERCEPTION DE LA LUMIERE; NUMERISATION TRI-DIMENSIONNELLE CANOPY ENVELOPE; CLUMPING; ISOLATED TREE; LIGHT INTERCEPTION; MODELLING; POROSITY; THREE-DIMENSIONAL (3-D) DIGITIZING.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200746bb7b37&uri=/notices/prodinra1/2008/07/
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Virtual trees and light capture: a method for optimizing agroforestry stand design Inra
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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With sub-optimum conditions the current representation of potential crop development patterns needs to be reconsidered Inra
Clouvel, P.; Lecoeur, J.; Gérardeaux, E.; Luquet, D.; Rey, H.; Martin, P..
Most current process-based crop models use "de Wit" representation, whereby different types of stress reduce a potential plant development pattern that solely depends on the variety, temperature and radiation. That approach was largely validated for conventional agriculture and the corresponding range of environmental conditions. The aim of our study was to test the robustness of that representation under early sub-optimum growth conditions. Investigations were carried out on cotton in southern France under controlled glasshouses and field conditions. We analysed the effects of light interception, water supply and planting density on the node appearance pattern of the plant's main stem. Early stress on seedlings and a variation in planting density induced...
Tipo: Journal Article Palavras-chave: PLASTOCHRONE; INTERCEPTION LUMINEUSE NODE INITIATION; NODE APPEARANCE RATE; LIGHT INTERCEPTION; WATER STRESS; PLANTING DENSITY; DE WIT REPRESENTATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200890050c35&uri=/notices/prodinra1/2008/09/
Registros recuperados: 5
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