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Registros recuperados: 22
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A 3D model for simulating the spatial and temporal distribution of temperature within ellipsoidal fruit Inra
Saudreau, M.; Sinoquet, H.; Santin, O.; Marquier, A.; Adam, B.; Longuenesse, J.J.; Guilioni, L.; Chelle, M..
A physical model simulating the spatio-temporal distribution of temperature in an ellipsoidal fruit has been developed. It is based on the numerical resolution of the three-dimensional (3D) unsteady heat conduction equation with unsteady and non-homogeneous heat fluxes as boundary conditions. The numerical scheme and the physical models have been tested by comparing with an analytical solution for simple configurations. The model quality has been assessed by comparing model outputs to temperature measured with thermocouples at several locations in isolated peach and apple fruits. The root mean square error (RMSE) for temperature simulated at a 1 min time step was about 0.8 °C. A sensitivity analysis showed that accurate estimations of the surface...
Tipo: Journal Article Palavras-chave: THERMOCOUPLE MICROCLIMATE; MODELING; THREE DIMENSIONAL; DYNAMICS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200873da589b&uri=/notices/prodinra1/2010/07/
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A method for 3D reconstruction of tree crown volume from photographs: assessment with 3D-digitized plants Inra
Phattaralerphong, J.; Sinoquet, H..
Tipo: Journal Article Palavras-chave: MODELISATION TRIDIMENSIONNELLE; CIME D'ARBRE; CANOPEE; METHODE PHOTOGRAPHIQUE CROWN DIMENSION; GAP FRACTION; IMAGE PROCESSING; PERSPECTIVE IMAGE; TREE ANALYZER.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200649e25dcc&uri=/notices/prodinra1/2007/01/
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A photographic gap fraction method for estimating leaf area of isolated trees: assessment with 3D digitized plants Inra
Phattaralerphong, J.; Sathornkich, J.; Sinoquet, H..
A method for computing leaf area of isolated trees from perspective photographs was developed. The method is based on gap fraction inversion. Photographs are discretized into picture zones where gap fraction is computed from image processing. Canopy volume and leaf area density associated with each picture zone are computed from geometrical considerations and inversion of gap fraction equations. Total leaf area and the vertical profile of leaf area are computed from the product of associated volume and its density. The method has been implemented in software called Tree Analyser, written in C++. The method has been tested by comparison with direct estimation of leaf area of three-dimensional (3D) digitized trees of walnut, peach, mango, olive and rubber....
Tipo: Journal Article Palavras-chave: TRAITEMENT D'IMAGE; ARBRE ISOLE; MODELISATION TRIDIMENSIONNELLE IMAGE PROCESSING; PERSPECTIVE IMAGE; TREE ANALYSER.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007133d2e24&uri=/notices/prodinra1/2008/08/
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Botanical determinants of foliage clumping and light interception in two-year-old coppice poplar canopies: assessment from 3-D plant mock-ups Inra
Casella, E.; Sinoquet, H..
Les paramètres botaniques (angle d’inclinaison des tiges et des branches, longueur des pétioles, phyllotaxie foliaire, taille et forme des feuilles) qui influencent l’interception lumineuse et l’agrégation foliaire ont été étudiés chez des taillis de peupliers (Populus spp.) âgés de deux ans à partir d’un modèle de simulation tridimensionnelle. De mai à septembre, les taillis étudiés ont présenté des valeurs d’indice foliaire (LAI) variant de 1 à 2 pour le clone Ghoy et de 2.5 à 7.4 pour le clone Trichobel. Les couverts étaient fortement agrégés, avec un paramètre d’agencement (μ) proche de 0.5. La fraction de rayonnement transmis au sol (τ) a varié de 0.59 en mai à 0.41 en septembre pour le clone Ghoy et de 0.42 à 0.08 pour le clone Trichobel, et elle...
Tipo: Journal Article Palavras-chave: MODELE TRIDIMENSIONNEL; MULTI-ECHELLE; STRUCTURE DU COUVERT; VARIATION SAISONNIERE; ANALYSE DE SENSIBILITE BIOMETRY; MULTI-SCALE; CANOPY STRUCUTRE; SEASONAL CHANGES; SENSITIVITY ANALYSIS; THREE-DIMENSIONAL MODEL.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20074580599&uri=/notices/prodinra1/2009/11/
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Does knowledge on fruit tree architecture and its implications for orchard management improve horticultural sustainability ? An overview of recent advances in the apple Inra
Lauri, P.E.; Costes, E.; Regnard, J.L.; Brun, L.; Simon, S.; Monney, P.; Sinoquet, H..
Orchard planting systems are often associated with tree shape management which has direct and practical implications on training and pruning strategies. The objective of horticultural practices is to reach the required height and shape as fast as possible and maintain the tree framework in time and space. Scientific studies consider the individual crown shape and the spatial organization of trees within the orchard, which encompass tree height, planting distances, alley width and/or the leaf area index (LAI). Therefore, eco-physiological studies are mostly dedicated to the optimisation of orchard performances, highlighting the importance of light interception and distribution. At orchard level, the individual tree is often considered as a black box, and...
Tipo: Conference Paper Palavras-chave: HORTICULTURE DURABLE TRAINING SYSTEMS; ECOPHYSIOLOGY; PESTS; DISEASES; MODELING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200955b6e9d6&uri=/notices/prodinra1/2010/03/
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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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Light and fruit quality distribution as influenced by training system in apple tree canopies: assessment from imaging of 3D digitised plants Inra
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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Mise au point : rayonnement solaire absorbe ou intercepte par un couvert vegetal Inra
Varlet-Grancher, C.; Gosse, G.; Chartier, M.; Sinoquet, H.; Bonhomme, R.; Allirand, J.M..
Cet article rappelle les principales définitions et méthodes de mesure utilisées dans les études du bilan radiatif solaire d’un couvert végétal. Le rayonnement solaire reçu par un couvert végétal peut être caractérisé par : - le rayonnement global (ou total): 9 Rgo mesuré par l’éclairement énergétique des rayonnements direct et diffus, - le rayonnement utile à la photosynthèse : PARo mesuré, pour la gamme spectrale 400-700nm, soit par l’éclairement énergétique EPARo soit par l’éclairement quantique QPARo. Le rayonnement absorbé représente la différence entre les rayonnements reçus (rayonnement incident et rayonnement réfléchi par le sol) et les rayonnements «perdus» (rayonnement réfléchi par l’ensemble sol-culture et rayonnement transmis au sol)....
Tipo: Journal Article Palavras-chave: RAYONNEMENT SOLAIRE GLOBAL; RAYONNEMENT UTILE A LA PHOTOSYNTHESE; EFFICIENCE DE L'ABSORPTION DU RAYONNEMENT SOLAIRE; EFFICIENCE DE L'INTERCEPTION DU RAYONNEMENT SOLAIRE.
Ano: 1989 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB8919367012060&uri=/notices/prodinra1/2009/11/
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Modelisation de l'interception des rayonnements solaires dans une culture en rangs. I. Aspects theoriques Inra
Sinoquet, H..
Un modèle de transferts radiatifs dans les cultures en rangs, utilisant une approche probabiliste, est développé. La structure géométrique du couvert est traduite en termes de facteurs de forme qui sont calculés à partir des lois classiques d’extinction du rayonnement dans la végétation. Cette procédure permet de réduire de manière importante les temps de calcul. Les rayonnements interceptés par la culture et le sol sont calculés en utilisant la méthode des radiosités, ce qui permet d’intégrer l’ensemble des rediffusions successives. L’isotropie des rayonnements rediffusés au niveau des feuilles est l’hypothèse la plus forte. La validité de la méthode utilisée est testée en comparant les résultats du modèle à ceux du modèle de Bonhomme et...
Tipo: Journal Article Palavras-chave: RADIOSITE; COUVERT HETEROGENE; CULTURE EN RANG; RAYONNEMENT SOLAIRE INTERCEPTE; GEOMETRIE DU COUVERT; STRUCTURE DU COUVERT.
Ano: 1989 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100021215020898&uri=/notices/prodinra1/2009/09/
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Modelisation de l'interception des rayonnements solaires dans une culture en rangs. II. Structure geometrique du couvert et validation du modele Inra
Sinoquet, H.; Bonhomme, R..
Dans une première partie, un modèle de transferts radiatifs appliqué à une culture en rangs a été décrit et testé sur des couverts homogènes. Pour effectuer la validation dans le cas de cultures en rang, des mesures de rayonnement réfléchi et transmis au sol ont été réalisées sur 2 parcelles de maïs dont les rangs étaient orientés est-ouest (E-O) pour l’une et nord-sud (N-S) pour l’autre. La structure géométrique, mesurée grâce à la méthode des silhouettes, est différente selon l’orientation des rangs. La répartition des azimuts des plantes n’est pas uniforme. Celle des inclinaisons des feuilles est globalement uniforme, mais présente des variations spatiales. Quant à la densité de surface foliaire, elle montre de grandes variations dans le plan...
Tipo: Journal Article Palavras-chave: COUVERT HETEROGENE; CULTURE EN RANG; RAYONNEMENT SOLAIRE INTERCEPTE; STRUCTURE DU COUVERT; GEOMETRIE DU COUVERT.
Ano: 1989 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100021216020899&uri=/notices/prodinra1/2009/09/
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Modelisation de l'interception des rayonnements solaires dans une culture en rangs. III. Application a une vigne traditionnelle Inra
Sinoquet, H.; Valancogne, C.; Lescure, A.; Bonhomme, R..
Un modèle d’interception du rayonnement solaire décrit précédemment est appliqué à un couvert spatialement discontinu : une vigne traditionnelle sur laquelle ont été mesurés les termes classiques du bilan radiatif et la distribution spatiale du rayonnement transmis au sol. La comparaison des mesures au modèle révèle un ajustement satisfaisant pour le rayonnement réfléchi (fig 4), mais assez médiocre pour le rayonnement transmis moyen (fig 5). Ceci est expliqué par l’utilisation de capteurs ponctuels qui, en raison de leur taille, mesurent plus souvent le rayonnement reçu au sol dans les taches de soleil ou les zones d’ombre qu’un rayonnement moyen. Ceci est vérifié en comparant les distributions mesurées et calculées du rayonnement transmis au sol (figs 7...
Tipo: Journal Article Palavras-chave: GEOMETRIE DE LA VEGETATION; CULTURE EN RANG.
Ano: 1992 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9400021475036772&uri=/notices/prodinra1/2009/10/
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Modélisation et potentialités du chauffage solaire des sols par paillage artificiel à la Guadeloupe Inra
Sinoquet, H.; Mignard, E.; Bonhomme, R..
La « solarisation » consiste à provoquer un échauffement du sol en appliquant un paillage artificiel à sa surface, ce qui peut permettre l’élimination d’agents pathogènes du sol. Des mesures de température effectuées à la Guadeloupe dans des sols paillés (film plastique opaque noir, film plastique transparent et verre) ont montré que des températures maximales supérieures à 50 °C pouvaient être atteintes dans la couche superficielle en fonction de la nature du paillage et de l’état hydrique du sol. Elles sont par ailleurs fortement liées à l’intensité du rayonnement solaire. D’autre part, un modèle numérique de comportement thermique des sols paillés a été développé et validé. Son utilisation a permis de déterminer les facteurs microclimatiques...
Tipo: Journal Article Palavras-chave: PAILLAGE PLASTIQUE; PAILLAGE ARTIFICIEL; TEMPERATURE DU SOL; DESINFECTION; RAYONNEMENT SOLAIRE; SOLARISATION; FLUX DE CHALEUR; BILAN THERMIQUE.
Ano: 1987 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9700021194065021&uri=/notices/prodinra1/2009/07/
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Parametrization of the functional-structural model for apple trees. Application to simulate photosynthesis and transpiration of fruiting branches Inra
Massonnet, C.; Regnard, J.L.; Costes, E.; Sinoquet, H.; Ameglio, T..
Temporal and spatial variations of photosynthesis and transpiration are particularly important when considering vegetative growth and fruit variability in fruit trees. Spatial variation of physiological processes depends on light distribution, which in turn depends on the relative position of main branches and geometry of their foliage. The general aim of this research was to investigate the capacity of RATP (radiation absorption, transpiration, photosynthesis) functional-structural model to adequately simulate the within-tree behavior of fruiting branches at an intra-hourly step-time. This paper presents the parameterization of this model on the apple tree, comparing two cultivars, and some first attempts at running the model. The experiments were carried...
Tipo: Conference Paper Palavras-chave: CONDUCTION STOMATIQUE; DIVERSITE INTRA-SPECIFIQUE STOMATAL CONDUCTANCE; WATER EXCHANGE; CARBON ASSIMILATION; INTRA-SPECIFIC DIVERSITY; MODELING.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007234a0ac6&uri=/notices/prodinra1/2007/11/
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Preliminary measurement and simulation of the spatial distribution of the morphogenetically active radiation (MAR) within an isolated tree canopy Inra
Combes, D.; Sinoquet, H.; Varlet-Grancher, C..
Tipo: Journal Article Palavras-chave: CRYPTOCHROME; PHOTOMORPHOGENESE.
Ano: 2000 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0100020682088708&uri=/notices/prodinra1/2009/12/
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Regional climate modulates the canopy mosaic of favourable and risky microclimates for insects Inra
Pincebourde, S.; Sinoquet, H.; Combes, D.; Casas, J..
1. One major gap in our ability to predict the impacts of climate change is a quantitative analysis of temperatures experienced by organisms under natural conditions. We developed a framework to describe and quantify the impacts of local climate on the mosaic of microclimates and physiological states of insects within tree canopies. This approach was applied to a leaf mining moth feeding on apple leaf tissues.2. Canopy geometry was explicitly considered by mapping the 3D position and orientation of more than 26 000 leaves in an apple tree. Four published models for canopy radiation interception, energy budget of leaves and mines, body temperature and developmental rate of the leaf miner were integrated. Model predictions were compared with actual...
Tipo: Journal Article Palavras-chave: ABSORBANCE; LETHAL TEMPERATURE; PHYLLONORYCTER BLANCARELLA; STOMATAL CONDUCTANCE; THERMAL ENVIRONMENT.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007812fc21e&uri=/notices/prodinra1/2008/07/
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Relative contribution of foliage display and leaf functions to branch physiological capacities in two apple cultivars : a functional-structural modeling approach Inra
Massonnet, C.; Regnard, J.L.; Lauri, P.E.; Sinoquet, H.; Costes, E..
The vegetative and reproductive growth of fruit trees depends on assimilate production which iscontrolled by tree canopy structure and leaf functions, both modulated by their interactions with theenvironment (Lakso 1994). Understanding more precisely how these factors influence the variation ofgrowth and yield is a major issue for fruit growers. Functional-structural plant models (FSPMs) offerpromising perspectives to understand these complex interactions at different spatial and temporalscales (Godin and Sinoquet 2005). In this context, the aim of the present study was to unravel in applethe relative contribution of foliage display and leaf functions (leaf stomatal and photosyntheticproperties) on light interception, transpiration and photosynthetic...
Tipo: Conference Paper Palavras-chave: GAS EXCHANGE; LEAF AREA DENSITY; RATP MODEL; SILHOUETTE TO TOTAL LEAF AREA; 3-D VIRTUAL PLANTS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200820e53829&uri=/notices/prodinra1/2008/10/
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Short term interactions between tree foliage and the aerial environment: an overview of modelling approaches available for tree structure-function models Inra
Sinoquet, H.; Le Roux, X..
Tipo: Journal Article Palavras-chave: FEUILLAGE; MODELE DE SIMULATION.
Ano: 2000 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0000015443084853&uri=/notices/prodinra1/2009/12/
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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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SIMWAL: a structural-functional model simulating single walnut tree growth in response to climate and pruning Inra
Balandier, P.; Lacointe, A.; Le Roux, X.; Sinoquet, H.; Cruiziat, P.; Le Dizès, S..
Tipo: Journal Article Palavras-chave: STRUCTURE; FONCTION; TAILLE; CROISSANCE; ARCHITECTURE 3D; BILAN CARBONE; ARCHITECTURE DE L'ARBRE.
Ano: 2000 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0200006614092836&uri=/notices/prodinra1/2009/12/
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Six-year time course of light-use efficiency, carbon gain and growth of beech saplings (Fagus sylvatica) planted under a Scots pine (Pinus sylvestris) shelterwood Inra
Balandier, P.; Sinoquet, H.; Frak, E.; Giuliani, R.; Vandame, M.; Descamps, S.; Coll, L.; Adam, B.; Prevosto, B.; Curt, T..
Two-year-old Fagus sylvatica L. saplings were planted under the cover of a Pinus sylvestris L. stand in the French Massif Central. The stand was differentially thinned to obtain a gradient of transmitted photosynthetically active radiation (PAR(t): 0-0.35). Eighteen Fagus saplings were sampled in this gradient, and their growth (basal stem diameter increment) was recorded over six years. Over the same period, morphological parameters (leaf area, number and arrangement in space) were monitored by 3D-digitization. Photosynthetic parameters were estimated with a portable gas-exchange analyzer. Photosynthesis was mainly related to light availability, whereas sapling morphology was mainly driven by sapling size. Annual stein diameter increment was related to...
Tipo: Journal Article Palavras-chave: FOREST REGENERATION; LEAF NITROGEN CONTENT; PHOTOSYNTHETIC PARAMETERS; SILHOUETTE TO TOTAL LEAF AREA RATIO (STAR).
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200757001434&uri=/notices/prodinra1/2008/08/
Registros recuperados: 22
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