Growth Dynamics and Morphology of Annual Shoots, According to their Architectural Position, in Young Cedrus atlantica (Endl.) Manetti ex Carrière (Pinaceae)

Sabatier, Sylvie-Annabel

doi:10.1006/anbo.1999.0939

Cited by 42 publications

(31 citation statements)

References 10 publications

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“…32 cm). This result is consistent with previous observations on Atlas cedar [32] which showed that sylleptic lateral shoots occurred when an extension rate threshold was reached by the parent shoot of the main stem. The long shoot zone length then linearly increases with the sequence length, but with a remarkable stability of the long shoots frequency, whatever the direction of the description (Tab.…”

Section: Discussionsupporting

confidence: 93%

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Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length

2007

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-A model for the vertical location of whorl and interwhorl branches was constructed for Atlas cedar (Cedrus atlantica Manetti). The vertical location of branches in the crown partly governs their further growth and mortality from which depend (i) the stem growth and form and (ii) the quality of lumber and veneer, including wood knots. The modeling method, based on an architectural approach, reveals branching patterns. Each annual shoot was considered as a sequence of successive positions, unbranched or branched with two types of branch: short or long shoot. Branching sequences were analyzed using hidden semi-Markov chains. A wide range of annual shoot lengths was sampled in order to determine the relationships between sequence length and the characteristics of every zone identified (frequency of every type of axillary production, probability of zone occurrence and probability of transition to the following zone). The model predicts branch vertical position which can be used as inputs for branch diameter and mortality models.branching pattern / branch vertical location / hidden semi-Markov chain / Cedrus atlantica Résumé -Prédiction de la position verticale des branches le long du tronc du cèdre de l'Atlas (Cedrus atlantica Manetti) en relation avec la longueur de pousse annuelle. Un modèle donnant la position verticale des branches verticillaires et interverticillaires a été établi pour le cèdre de l'Atlas (Cedrus atlantica Manetti). La position verticale des branches dans le houppier détermine en partie leur développement ultérieur et leur mortalité dont dépendent (i) la croissance et la forme de la tige et (ii) la qualité des sciages et des placages comprenant les noeuds. La méthode de modélisation, basée sur une approche architecturale, met en évidence les caractéristiques de la branchaison. Chaque pousse annuelle est considérée comme une séquence de positions successives soit sans branche, soit porteuse d'un rameau court ou long. Les séquences ont été analysées en utilisant les semichaînes de Markov cachées. Une large gamme de longueur de pousse a été échantillonnée pour évaluer les relations entre la longueur des séquences et les caractéristiques des zones identifiées (fréquence de chaque type de production axillaire, probabilité de la présence de la zone et probabilité de transition vers la zone suivante). Le modèle prédit la position verticale des branches qui peut être ensuite utilisée comme entrée de modèles de diamètre et de mortalité de ces branches.branchaison / position verticale des branches / semi-chaîne de Markov cachée / Cedrus atlantica

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Section: Discussionsupporting

confidence: 93%

“…With regards to the identified zones, our results indeed confirm for the most part the previous qualitative observations on this species [8,23,31,32]. From the base to the top of the annual shoot, 5 zones were identified: -The first two zones, the basal unbranched zone (i.e.…”

Section: Discussionsupporting

confidence: 89%

Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length

2007

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“…This further indicates that light conditions did not qualitatively modify the developmental sequence of the species but modulated its progress by accelerating or slowing it down, as the ecological conditions were favourable or limiting. According to the environmental conditions, a development stage can thus be reached for different global dimensions like total height, as demonstrated by Sabatier and Barthélémy [78] on Cedrus atlantica, Nicolini et al [50] and Heuret et al [36] on Quercus petraea. As suggested by these authors, one can reasonably presume that, (i) for a given ASD (i.e., trees with similar physiological ages), trees in the clearing were chronologically younger than those in the understorey, (ii) there was a difference in both the physiological and chronological ages between trees of similar height and growing in these two environments (see also [9] for review).…”

Section: Influence Of Asd and Irradiance On Tree Dimensionsmentioning

confidence: 94%

Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)

et al. 2005

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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 a natural light gradient. The results show that some traits could have an ASD-dependence at the whole plant and leaf level without control of light. The changes observed relate to vigour thresholds the plant has to reach to shift from one ASD to another (i.e., the number of nodes and the internodes length per Growth Unit). Light conditions do not modify these thresholds but may modify the time they are crossed. Tree height was found strongly modulated by light conditions; hence, at a similar height, individuals may belong to different ASD. At the functional level, a decrease in N m , and A maxm was observed with increasing light availability, while N a increased and A maxa remained unaffected. An ASD effect was also observed on A maxa and LMA but not on A maxm . These results demonstrated a weak ability of photosynthetic plasticity in response to light conditions, and that variations of leaf photosynthetic variables according to ASD can be explained by modifications in leaf nitrogen and LMA. Questions on the reliability of a height-based sampling strategy for evaluating the phenotypic plasticity of trees in relation to light conditions are raised.Dicorynia guianensis / leaf structure / functional leaf traits / plasticity / tree structure Résumé -Relations entre architecture des arbres et traits fonctionnels foliaires de l'angélique Dicorynia guianensis Amshoff (Caesalpiniaceae) en forêt tropicale humide. Les relations entre stades architecturaux de développement (ASD), morpho-anatomie foliaire et capacités photosynthétiques ont été étudiées chez Dicorynia guianensis, une espèce forestière de Guyane. Les ASD ont été définis à l'aide de critères qualitatifs par une méthode simple de description architecturale puis échantillonnés le long d'un gradient naturel de lumière. Les résultats montrent que chaque ASD peut être identifié par un syndrome de caractères quantitatifs. Ces caractères évoluent d'un stade à l'autre, et dans les différents milieux, selon une séquence ordonnée d'événements qui se manifestent pour des seuils de vigueur donnés. Les conditions lumineuses ne modifient pas ces seuils mais avanceraient ou différeraient dans le temps leur passage. La hauteur des individus et le LMA sont fortement modulés par la lumière. Ainsi, pour une même hauteur, des individus peuvent correspondre à des ASD variés. Au niveau fonctionnel, l'augmentation du rayonnement incident s'est traduite par une diminution de N m , et de A maxm et par une augmentation de N a , tandis que A maxa n'a pas été affectée. Un effet marqué de l'ASD a été constaté sur A maxa et LMA mais pas sur A maxm . Ces résultats révèlent une faible plasticité photosynthétique chez D. guianensis et mon...

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“…Each year, short shoots form only a spiral cluster of needles and elongate approximately 1 mm per year. They tend to be mostly located in the basal section of each annual shoot of the stem, below the long shoots (Sabatier and Barthélémy 1999;Courbet et al 2007a) .…”

Section: Branching Patterns Of Atlas Cedarmentioning

confidence: 99%

Diameter and death of whorl and interwhorl branches in Atlas cedar (Cedrus atlantica Manetti): a model accounting for acrotony

Courbet

Hervé²,

Klein

et al. 2011

Annals of Forest Science

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Abstract& Introduction Branch size and branch status (dead or alive) are important characteristics closely related to tree growth and wood quality. The aim of this study was to design models for the diameter and status of branches in Atlas cedar (Cedrus atlantica Manetti). & Material and methods The models were developed from data collected on a set of 32 trees with a wide range of heights (from 3 to 36 m), girths (from 13 to 226 cm), and ages (from 20 to 95 years). A single general segmented model was designed for both whorl and interwhorl branch diameter, taking into account the tree and annual growth unit random effects. & Results The model's "potential x reducer" form describes the maximum branch diameter profile along the tree and the acrotonic gradient observed in annual shoots. The diameter and status of every branch were modeled based on the vertical position on the trunk and on the height of the base of the living crown. The tree diameter and the branch diameter were used as additional explanatory variables in the branch diameter model and the branch status model, respectively. & Conclusion The model structure is sufficiently general to be suited after re-parameterization for many coniferous species with interwhorl branches such as Spruces, Firs, and Larches.

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Growth Dynamics and Morphology of Annual Shoots, According to their Architectural Position, in Young Cedrus atlantica (Endl.) Manetti ex Carrière (Pinaceae)

Cited by 42 publications

References 10 publications

Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length

Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length

Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)

Diameter and death of whorl and interwhorl branches in Atlas cedar (Cedrus atlantica Manetti): a model accounting for acrotony

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