Yves Caraglio's research while affiliated with French National Centre for Scientific Research and other places

Publications (105)

Article
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Parkia biglobosa is a much-loved and over-exploited African savannah spe- cies for its socio-economic importance. Knowing and taking into account its architectural unit, which is the basis for diagnosing phenology, productivity and tree health, could provide a new perspective on its sustainable manage- ment. The aim of this study is to establish...
Chapter
Technological breakthroughs concerning both sensors and robotized plant phenotyping platforms have totally renewed the plant phenotyping paradigm in the last two decades. This has impacted both the nature and the throughput of data with the availability of data at high-throughput from the tissular to the whole plant scale. Sensor outputs often take...
Article
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Tree structural and biomass growth studies mainly focus on the shoot compartment. Tree roots usually have to be taken apart due to the difficulties involved in measuring and observing this compartment, particularly root growth. In the context of climate change, the study of tree structural plasticity has become crucial and both shoot and root syste...
Article
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La ramificazione si osserva in cima, mentre per la reiterazione va considerata l'intera chioma. Succhioni, ricacci e rami epicormici designano strutture della stessa natura: i sostituti. Senescenza non è deperimento, resistenza non fa sempre rima con resilienza. Per padroneffiare il metodo Archi è fondamentale conoscerne i termini e i concetti.
Article
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La méthode Archi s'intéresse à la résilience des arbres en ajoutant au relevé des symptômes habituels (ramification appauvrie, mortalité anormale, etc.), un examen des suppléants ainsi que, pour certaines essences, un diagnostic des stades de développement. Son appropriation nécessite une définition précise des termes et concepts utilisés.
Article
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Mientras que la ramificación se observa en la cima, la reiteración concierne a toda la copa. Una mortalidad en la cima no es suficiente para hablar de descenso de cima. Chupones, rebrotes y brotes epicórmicos hacen referencia a estructuras de la misma naturaleza, rebautizadas como «suplentes». La senescencia no significa decaimiento. Resistencia no...
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Knowledge of plant architecture allows retrospective study of plant development, hence provides powerful tools, through modelling and simulation, to link this development with environmental constraints, and then predict its response to global change. The present study aims to determine some of the main endogenous and exogenous variables driving the...
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Within ornamental horticulture context, visual quality of plants is a critical criterion for consumers looking for immediate decorative effect products. Studying links between architecture and its phenotypic plasticity in response to growing conditions and the resulting plant visual appearance represents an interesting lever to propose a new approa...
Article
Plants exhibit dependences between shoot growth and branching that generate highly structured patterns. The characterization of the patterning mechanism is still an open issue because of the developmental processes involved with both succession of events (e.g. internode elongation, axillary shoot initiation and elongation) and complex dependences a...
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In this work, we present a dataset, which provides information on the structural diversity of some endemic tropical species in Madagascar. The data were from CIRAD xylotheque (since 1937), and were also collected during various fieldworks (since 1964). The field notes and photographs were provided by French botanists; particularly by Francis Hallé....
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Key message: The chronology of periods of organogenesis and elongation is highlighted in Pinus halepensis. The two first growth units of an annual shoot are preformed inside the bud during the previous year. The following growth units are formed during the spring or summer of the current year. Context: Analysis of annual shoot length growth phenolo...
Article
The transparency of trees is the most important indicator for a forest health assessment. This paper presents an efficient method for calculating the crown transparency coefficient from tree binary images. This coefficient is based on the automated quantification of the deep indentation, macro-hole and micro-hole densities. Circular structuring ele...
Conference Paper
FSPM Plant and crop models are popular in the research community and there is increasing interest in their applications, from yield prediction to crop management optimization. A wide range of approaches and their software implementation can be found in the literature, with a large diversity in modelling scale (from plant organ to plot levels) and s...
Conference Paper
L'analyse d'image est un puissant outil pour de nombreuses disciplines scientifiques. Cette présentation aborde comment des séquences d'images obtenues sur des plantes en rotation peuvent être traitées dans le cadre d'études corrélatives et prédictives avec d'autres jeux de données, notamment pour la recherche de paramètres en relation avec l'archi...
Book
La Villa Thuret rassemble des collections dendrologiques exotiques adaptées au climat méditerranéen. Originaires de pays à climats variés, méditerranéens ou non, ces arbres tolèrent les aléas du climat d’accueil, en particulier chaleur et sécheresse estivales. Ils présentent des modalités de croissance et des phénologies diverses. Un échantillon d’...
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This study aimed to identify robust indicators that summarize the respective importance of ontogeny and environmental constraints in tree development. In the proposed approach, tree growth data correspond to the retrospective measurement of annual shoot characteristics (e.g. length, number of branches) along the main stem. We applied segmentation m...
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A l'aide de la méthode architecturale nous donnons une description du développement complet de Platanus hybrida Brot. L'analyse architecturale fait ressortir une organisation monopodiale très forte malgré un fonctionnement sympodial. Ainsi il y a construction d'un tronc et de branches par la succession linéaire de modules annuels. La cime du Platan...
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Background and aims: Analysis of anatomical sections of wood provides important information for understanding the secondary growth and development of plants. This study reports on a new method for the automatic detection and characterization of cell files in wood images obtained by light microscopy. To facilitate interpretation of the results, rel...
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Basés sur le diagnostic architectural, quatre outils sont proposés pour diagnostiquer les arbres et évaluer leur réactivité face aux perturbations environnementales. Le diagnostic ontogénique, outil déjà utilisé, permet d'identifier le stade de développement de l'arbre. Des checklists de marqueurs architecturaux listent les critères pour décrire un...
Article
Élaborer des tarifs génériques, valables pour toutes les essences de la ressource forestière,est une véritable gageure compte tenu de la masse de données nécessaire pour ajusterles modèles. Si l’information est largement disponible pour certaines essences, d’autressont peu (ou pas) renseignées. D’où l’idée de constituer des groupes d’essences de mê...
Chapter
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Climate change and extreme events have a deep and long lasting impact on tree architectural development, through a limitation of branching rate, leaf or needle size and number, and changes in reproduction patterns. These limitation
Chapter
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The analysis of wood anatomical sections is of great interest for understanding the growth and development of plants. We propose a novel method for automatically identifying and characterizing radial files in wood microscopic images of gymnosperms. A key point is to be able to assign a priori reliability coefficient to the results, particularly for...
Book
This paper demonstrate that tree architectural development of is highly dependent on climate variations and accidents, particularly at the level of their branch ramification rate and polycyclism. Similarly, the number, size and life span of leaves on a twig vary annually with the climate. By means of a growth simulator, we show that the deficit of...
Data
Summary • Plant architecture is the result of repetitions that occur through growth and branching processes. During plant ontogeny, changes in the morphological characteristics of plant entities are interpreted as the indirect translation of different physiological states of the meristems. Thus connected entities can exhibit either similar or very...
Conference Paper
Context: Architectural studies highlight recurrent morphogenetical gradients that are observed on some tree species. These morphogenetical gradients are linked to morphological trends among successive shoots throughout plant structure and ontogeny. This study aims at testing a potential origin of these gradients as the complex result of some core p...
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Context Understanding the effects of exogenous factors on tree development is of major importance in the current context of global change. Assessing the structure development of trees is difficult given that they are large and complex organisms with lifespan of several decades. Aims We used a retrospective analysis to derive the ontogenetic trends...
Article
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Polycyclism, the ability for a plant to produce several flushes in the same growing season, is a key process of plant development. Polycyclism frequency is likely to change with the anticipated climate trend, expected to impact plant growth over the next century. However, polycyclism processes are not well described in the literature, and an import...
Article
Dans le cadre général de l'étude dynamique des caractéristiques d'un houppier vivant, l'observation des sections transversales de branches de pin laricio (Pinus nigra Arn. ssp. Laricio (Poir.) Maire) de différents âges nous a permis de travailler le problème des cernes manquants, autrement dit d'étudier la discontinuité de l'activité cambiale. Ce t...
Article
A qualitative architectural analysis conducted on young beech (Fagus sylvatica L.), benefiting from the protection of a leaf canopy or exposed to full sunlight, revealed architectural characteristics susceptible of influencing the arrangement of vertical lateral axes entering in direct competition with the trunk and contributing to the formation of...
Conference Paper
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Plant architecture processes are commonly neglected in the studies about climate change impact. In terms of biomass, primary growth (i.e. lateral and principal twig growth) and leaf production are far more important than secondary growth (i.e. radial growth). Polycyclism, or the ability for a plant to produce several flushes in the same growth seas...
Chapter
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Development of species specific allometric equations and expansion factors for the calculation of total biomass and carbon stocks in French forest. Example of applications to Pinus pinaster in Gascony. Extension to the case of Eucalyptus in Congo.
Article
This study aimed to identify and characterize the ontogenetic, environmental and individual components of forest tree growth. In the proposed approach, the tree growth data typically correspond to the retrospective measurement of annual shoot characteristics (e.g. length) along the trunk. Dedicated statistical models (semi-Markov switching linear m...
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Exceptional climatic events from 2003 to 2005 (scorching heat and drought) affected the whole of the vegetation in the French Mediterranean region and in particular the Scots pine (Pinus sylvestris L.), one of the most important forest tree species in this area. To understand its response to these extreme conditions, we investigated its radial grow...
Article
The primary growth of trees may be studied either by following their development over time, which is costly and requires long-term monitoring, or by a posteriori growth analyses. Trees in temperate forests show rhythmic growth, which is characterised by morphological or anatomical markers. The study described here focuses on the pith of trees as an...
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Wildland fires are driven by the heat transferred from the fire source to the unburned fuel bed and this transfer is likely to be affected by the spatial heterogeneity of fuel element distributions at different scales from shoot to stand. In a context of theoretical fire modelling, we investigated the impact of a departure from randomness of fuel d...
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AmapSim is a tool that implements a structural plant growth model based on a botanical theory and simulates plant morphogenesis to produce accurate, complex and detailed plant architectures. This software is the result of more than a decade of research and development devoted to plant architecture. New advances in the software development have yiel...
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PMA06: The Second International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications, 13-17 novembre 2006, Beijing, P. R. China.
Article
Observed growth, as given, for instance, by the length of successive annual shoots along the main axis of a plant, is mainly the result of two components: an ontogenetic component and an environmental component. An open question is whether the ontogenetic component along an axis at the growth unit or annual shoot scale takes the form of a trend or...
Article
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Background and Aims The architecture of a plant depends on the nature and relative arrangement of each of its parts; it is, at any given time, the expression of an equilibrium between endogenous growth processes and exogenous constraints exerted by the environment. The aim of architectural analysis is, by means of observation and sometimes experime...
Article
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Introduction Observed growth, as given, for instance, by the length of successive annual shoots along the main axis of a plant, is mainly the result of two components: an ontogenetic component and an environmental component. We made the assumption of a decomposition model where the ontogenetic growth component and the environmental component (mainl...
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This study looked at the interactive effects of tree architectural stage of development (ASD) and light availability on different plant traits (growth parameters, leaf morpho-anatomy and photosynthetic capacities) in the tropical species Dicorynia guianensis. A qualitative architectural analysis was used to categorize tree individuals sampled along...
Article
Plant architecture is the result of repetitions that occur through growth and branching processes. During plant ontogeny, changes in the morphological characteristics of plant entities are interpreted as the indirect translation of different physiological states of the meristems. Thus connected entities can exhibit either similar or very contrasted...
Article
Radiative transfer models have been widely used to interpret the radar backscatter from forested areas. Most of these models are based on an iterative solution of the radiative transfer equation, usually solved up to first or second order, thus taking into account single and double scattering. Although this method leads to results agreeing well wit...
Article
Young Turkish pine (Pinus brutia Ten.) individuals were planting, in the Montpellier region, with or without tube shelter alternating. The effect of these tubes was determinate thanks to the growth study of the main polycyclic stem (several elongation phases separated by rest periods). The analysis was done by a quantitative comparison of successiv...
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Architectural analyses of temperate tree species using a chronological approach suggest that the expression of epicormic branches is closely related to low growth rates in the axes that make up the branching system. Therefore, sole consideration of epicormic criteria may be sufficient to identify trees with low secondary growth levels or with both...
Chapter
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Modélisation et simulation de l´architecture des végétaux Bouchon J., Reffye de P. e Barthélémy D. (Eds) 1997. Science Update, I.N.R.A. Editeur (Versailles), França, 435p. Tradução (Embrapa Florestas): Miroslava Rakocevic, Moacir José Sales Medrado e Jorge Ribaski Introdução Do ponto de vista histórico, a utilização de termos em morfologia vegetal...