Hervé Raymond Rey

Hervé Raymond Rey
Cirad - La recherche agronomique pour le développement | CIRAD · Unité Mixte de Recherche Botanique et Bio-Informatique de l’Architecture des Plantes (AMAP)

Ingenior & Phd in Agronomy

About

121
Publications
40,906
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1,205
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Introduction
Structural and functionnal modelling of plant architecture, including vegetative, reproductive and root compartments
Additional affiliations
March 1989 - present
Cirad - La recherche agronomique pour le développement
Position
  • Ingenieur chercheur en agonomie
March 1989 - October 2016
Cirad - La recherche agronomique pour le développement
Position
  • Ingenieur-Docteur, Chercheur en agonomie
Education
January 2000 - December 2003
September 1974 - September 1977

Publications

Publications (121)
Article
Full-text available
With the aim to explore how plants acclimate to elevation changes in the understudied (sub)alpine tropics we tested two hypotheses along a 1000-m elevation gradient in Mexico: (H1) due to a severe increase in abiotic constraints at higher elevations, the functional traits of the plant species will converge toward more resource conservation, and (H2...
Article
Full-text available
Objectives Altitude integrates changes in environmental conditions that determine shifts in vegetation, including temperature, precipitation, solar radiation and edaphogenetic processes. In turn, vegetation alters soil biophysical properties through litter input, root growth, microbial and macrofaunal interactions. The belowground traits of plant c...
Article
Full-text available
Background and aimsIn temperate conifer forests, soil temperature is an important driver of fine root growth and winter root growth can occur during aerial dormancy. We hypothesize that in conifers, stocks of non-structural carbohydrates (NSC) in fine roots are high enough to provide energy for root growth and production throughout the year, even w...
Article
Full-text available
Background and aims: Many studies exist in the literature dealing with mathematical representations of root systems, categorized, for example, as pure structure description, partial derivative equations or functional-structural plant models. However, in these studies, root architecture modelling has seldom been carried out at the organ level with...
Article
Background and aims: The structure of heterogeneous forests has consequences for their biophysical environment. Variations in the local climate significantly affect tree physiological processes. We hypothesize that forest structure also alters tree root elongation and longevity through temporal and spatial variations in soil temperature and water...
Article
Full-text available
Date palm (Phoenix dactylifera L.) is mainly cultivated for its edible fruit and is of great socio-economic importance for the populations of arid zones. Analysis of the date palm genetic diversity in the Old World had revealed a strong genetic structure with the existence of two gene pools, one Eastern comprising Asia and Djibouti, and one Western...
Article
Full-text available
The development of new breeding strategies to find more sustainable and productive systems is a major challenge to cope with ceaseless increasing demands for palm oil. Optimizing plant architecture to increase radiation interception efficiency could be an option for enhancing potential crop production. Most oil palms grown in the world are Deli dur...
Poster
Full-text available
La simulation est utilisée dans les études récentes pour un but del’extraction des résultats d’une action sur un élément sans réaliserl’expérience sur l’élément réel. Notre travail est fondé sur unemodélisation de l’architecture de palmiers dattiers mise en œuvre àtravers un protocole de mesures (MOCAF/OMAM) qui se base sur desparamètres métriques...
Poster
Full-text available
La simulation informatique est de plus en plus utilisée dans les préparations de nouveaux projets, avec pour buts la diminution des coûts de conception et la concision du temps. Notre travail est basé sur la modélisation de l’architecture de palmiers dattiers mise en œuvre à travers un protocole de mesures (MOCAF/OMAM) qui se base sur des paramètre...
Presentation
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This presentation aims to be a working compilation of terms used for description of morphology, anatomy and architecture of arecaceae.
Presentation
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This didactics presentation shows some short aspects about Oil-palm plantation.
Presentation
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Goals and resources about the MOCAF project. Countries, Works, People, Training, Observations, Data acquisition, Modelling and Communicationss are biefly illustrated. PRINCIPES model is one of main results of this Euromediterranee 3+3 Project.
Presentation
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In complement of MOCAF Project, OMAM Project is a PHC Maghreb project which aimed to work on Phoenix architecture modelling. In relationship with field water supply, works on vegetative an reproductive aerial parts are complemented with roots observations and architectural modelling.
Presentation
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Main features about these 3 main arecacea, whose production is important all over the world.
Presentation
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PRINCIPES describes whole palm-trees 3D architecture at simple organ’s level. This model is dedicated to palm-tree aerial vegetative and reproductive parts. It enables modelling and simulation of Arecaceae, at genus, species or variety levels. This model can apply for instance to agronomic most important palm-trees, such as oil-palm, date-palm and...
Presentation
Full-text available
PRINCIPES describes whole palm-trees 3D architecture at simple organ’s level. This model is dedicated to palm-tree aerial vegetative and reproductive parts. This presentation is dedicated to aerial vegetative compartment observations and modelling.
Presentation
Full-text available
PRINCIPES describes whole palm-trees 3D architecture at simple organ’s level. This model is dedicated to palm-tree aerial vegetative and reproductive parts. This presentation is dedicated to reproductive compartment observations and modelling.
Article
Full-text available
The date palm (Phoenix dactylifera L.), a dioecious species, is of particular interest in the Sahel due to its phenological plasticity in relation to climate change and its double- flowering capacity. This article explores local practices and knowledge associated with date palm cultivation in the oasis basins of southeastern Niger, and provides an...
Article
Full-text available
Three-dimensional (3D) reconstruction of plants is time-consuming and involves considerable levels of data acquisition. This is possibly one reason why the integration of genetic variability into 3D architectural models has so far been largely overlooked. In this study, an allometry-based approach was developed to account for architectural variabil...
Poster
Full-text available
Description of the 3D-reconstruction model of oil palm and its application to estimate light interception among progenies.
Article
Full-text available
The study focuses on an architectural description of two Algerian cultivars of Phoenix dactylifera L. The observations were conducted at the Wilaya of Biskra on Deglet Nour and Litima's palms. The MOCAF/OMAM application protocol based on metric and geometric parameters of the vegetative part and reproductive part., in particular by its aspects morp...
Article
The date palm (Phoenix dactylifera L.) is the main element upon which the sustainable biophysical and socio-economic organizations of the oasis ecosystem are based. The present study was carried to understand the phenology and the architecture of the date palm female inflorescence. The vegetal material was composed of two Tunisians cultivars of Pho...
Poster
Full-text available
Le palmier dattier est une monocotylédone arborescente appartenant à la famille des Arecaceae. Sa topologie aérienne est simple à décrire : un stipe robuste surmonté par une couronne de palmes. Chaque palme est composée par une nervure principale qui porte de part et d’autre des pennes (épines et folioles). Les premiers modèles architecturaux propo...
Poster
Full-text available
S. Gammoudi, H. El Masoudy*, H. Rey, S. Griffon , M. Bennaceur, C. Littardi, N. Bouguedoura, M. Bensalah, R. Lecoustre et M. A. Elhoumaizi.
Poster
Full-text available
L’arrangement phyllotaxique du palmier dattier (Phoenix dactylifera L.) est spiralé qui donne lieu à une paire de spirales ou parastiches apparents (8,5) et à sens opposé. Selon le théorème fondamental de la phyllotaxie (FTOP) l’angle de divergence d pour un tel arrangement phyllotaxique, doit être compris entre [135°,144°] et [135.95°, 138.14°] so...
Conference Paper
Full-text available
Plant architecture is defined like the whole of the structural forms which the plant presents through its existence. In the context of the present study, a statistical checking of relationships between the characteristic parameters in terms of vegetative aerial and reproductive architecture of the date palm was done, this allow to implement a new m...
Conference Paper
Full-text available
The development of new breeding strategies to find more sustainable and productive systems is a major challenge to cope with ceaseless increasing demands for palm oil. Optimizing plant architecture to increase radiation interception efficiency could be an option for enhancing potential crop production. Most oil palms grown in the world are Deli dur...
Article
Full-text available
Characterizing the above-and belowground carbon stocks of ecosystems is vital for a better understanding of the role of vegetation in carbon cycling. Yet studies on forest ecosystems at high altitudes remain scarce. We examined above-and belowground carbon partitioning in trees growing in mixed montane/upper montane forest ecosystems in the French...
Thesis
Full-text available
Nous nous proposons, dans le présent mémoire, d'étudier l'évolution des techniques agricoles en sec dans le nord de la Tunisie, entre 1881 , date de l'instauration du protectorat français en Tunisie, et la période contemporaine, arrêtée à I970.
Article
Individual variability generally exists in crop fields. It increases with an increase in plant population density, water or nutrient deficiency, or spatio-temporal irregularity, and often results in a reduction in yield. As individual variability exists in a community but is expressed through individuals, we studied it by applying two models, one a...
Thesis
Full-text available
Leaf area of sunflowers (Helianthus annuus L.) in agricultural stands is variable, even in the absence of abiotic stress, leading to heterogeneous productivity of these stands. A former study showed that for leaf rank 8 along the stem, the relative expansion rate varied during leaf area establishment, with an exponential phase followed by a decreas...
Conference Paper
Full-text available
The date palm, Phoenix dactylifera L. (Arecaceae), is a subtropical palm widely cultivated for numerous uses and ecosystematic services. The date palm is a dioecious species, which shows a marked dimorphism in inflorescence structure. To describe this dimorphism, architecture and geometry of male and female inflorescences were studied through kinet...
Conference Paper
Full-text available
Highlights: A generic leaf area growth model based on the simulation of leaf growth dynamics in response to light microclimate was built, calibrated and validated for three dicotyledonous species.
Conference Paper
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Highlights: Present study has introduced a comprehensive theoretical architecture to note probability of phytomer occurrence to describe wheat structural development. This provided an intermediary to compute the overall level of growth functions. The model then was calibrated on observation of variform individuals.
Article
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This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the cont...
Article
Full-text available
The date palm, Phoenix dactylifera L. (Arecaceae), is a subtropical palm widely cultivated for numerous uses and ecosystematic services. The date palm is a dioecious species, which shows a marked dimorphism in inflorescence structure. To describe this dimorphism, architecture and geometry of male and female inflorescences were studied through kinet...
Conference Paper
Full-text available
L'analyse de l'architecture du système racinaire de palmier dattier Phoenix dactyl?l'era L. a un grand intérêt car sa culture est traditionnellement menée en oasis sur trois étages de cultures, en association avec des arbres fruitiers, des céréales ou des fourrages par exemple. Son étude doit alors permettre de qualifier, puis quantifier les phénom...
Conference Paper
Full-text available
Dans la cadre du réseau MOCAF de nombreuses mesures morphométriques et géométriques ont été réalisées sur divers morphotypes et cultivars de Phoenix dactylifera L. dans les pays méditerranéens membres du consortium. Depuis le début des recherches en modélisation de l'architecture de Phoenix dactylifera L.;de nombreuses mesures ont été effectuées su...
Article
Full-text available
Background and aims Plant roots provide mechanical cohesion (c r ) to soil on slopes which are prone to shallow landslides. c r varies in heterogeneous natural forests due to the spatial, inter- and intra-annual dynamics of root demography. Characterizing root initiation density and mortality, as well as how root growth is influenced by abiotic and...
Article
Vegetation is increasingly used to protect artificial and natural slopes against shallow landslides. Mechanically, plant roots reinforce soil along a slope by providing cohesion (cr). cr is usually estimated using either of two models: a Wu and Waldron's Model (WWM) or a Fiber Bundle Model (FBM). The WWM assumes that all fine and medium roots break...
Article
Full-text available
Aims: This paper proposes a general and minimal continuous model of root growth that aggregates architectural and developmental information and that can be used at different spatial scales. Methods: The model is described by advection, diffusion and reaction operators, which are related to growth processes such as primary growth, branching, mortali...
Conference Paper
Full-text available
derived from image processing of living sepals revealed that while the timing of endoreduplication is central to the pattern of giant cells and small cells, it is insufficient to generate the entire diversity of cell sizes. More live imaging showed that the length of the cell cycle is important for cell size because longer cell cycles give the cell...
Conference Paper
Full-text available
Dans les années 1970, à une époque où les statistiques appliquées aux sciences agronomiques se cantonnaient à travailler sur des productions à l'hectare et des blocs de traitement statistiques des essais génétiques et de fumure, alors même que les études biologiques et génétiques se penchaient plus sur l'intimité de la cellule, un chercheur s'est i...
Conference Paper
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Introduction Process Based Models (PBM) are used to compute crop yield, they treat a field as a homogenous medium, total production is computed accurately, but there is little information on individual variability of plants, and number and size of organs. Functional Structural Plant Models (FSPM) simulate individual plant development and growth, th...
Conference Paper
Full-text available
Modeling and simulating plant root growth in connection with soil water and nutrient transfer is an important challenge that finds applications in many fields of research. Density based models, which are often represented under the form of partial differential equations (PDE), aim in integrating root characteristics through time and spatial dependa...
Conference Paper
Full-text available
The hypothesis that the evolution of early land plants played a major role in the carbon cycle and ultimately affected life ln the Devonian is now widely popularized (Algeo Et Scheckler 1998), and study of the mechanisms regulating this relation regularly refined. According to Beerting Et Berner (2005), plant size represents a signifieant parameter...
Conference Paper
Full-text available
The earliest plants to have reached the tree habit belong to the Pseudosporochnales, a Middle Devonian order of Cladoxylopsida. Several divergent reconstructions of arborescent pseudosporochnaleans have been presented in the 20th century literature. The recent reassessment of Belgian remains of Pseudosporochnus together with the discovery of well-p...
Article
Full-text available
It is now widely recognized that plant roots can reinforce soil against shallow mass movement. Although studies on the interactions between vegetation and slope stability have significantly augmented in recent years, a clear understanding of the spatial dynamics of root reinforcement (through additional cohesion by roots) in subalpine forest is sti...
Article
Full-text available
Architectural descriptors were used to understand root system structure and development in white yam (Dioscorea rotundata Poir., Dioscoreaceae), a tuber monocot. Observations were made on seedlings and plant derived from tuber fragments, cultivated in greenhouses over a developmental cycle. This study demonstrated that both seedlings and plants der...