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Are inter- and intraspecific variations of sapling crown traits consistent with a strategy promoting light capture in tropical moist forest?

Laurans Marilyne, Vincent Grégoire. 2016. Are inter- and intraspecific variations of sapling crown traits consistent with a strategy promoting light capture in tropical moist forest?. Annals of Botany, 118 (5) : 983-996.

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Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Background and Aims: Morphological variation in light-foraging strategies potentially plays important roles in efficient light utilization and carbon assimilation in spatially and temporally heterogeneous environments such as tropical moist forest understorey. By considering a suite of morphological traits at various hierarchical scales, we examined the functional significance of crown shape diversity and plasticity in response to canopy openness. Methods: We conducted a field comparative study in French Guiana among tree saplings of 14 co-occurring species differing in light-niche optimum and breadth. Each leaf, axis or crown functional trait was characterized by a median value and a degree of plasticity expressed under contrasting light regimes. Key Results: We found divergent patterns between shade-tolerant and heliophilic species on the one hand and between shade and sun plants on the other. Across species, multiple regression analysis showed that relative crown depth was positively correlated with leaf lifespan and not correlated with crown vertical growth rate. Within species displaying a reduction in crown depth in the shade, we observed that crown depth was limited by reduced crown vertical growth rate and not by accelerated leaf or branch shedding. In addition, the study provides contrasting examples of morphological multilevel plastic responses, which allow the maintenance of efficient foliage and enable effective whole-plant light capture in shaded conditions under a moderate vertical light gradient. Conclusions: This result suggests that plastic adjustment of relative crown depth does not reflect a strategy maximizing light capture efficiency. Integrating and scaling-up leaf-level dynamics to shoot- and crown-level helps to interpret in functional and adaptive terms inter- and intraspecific patterns of crown traits and to better understand the mechanism of shade tolerance.

Mots-clés Agrovoc : forêt, forêt tropicale humide, lumière, morphologie végétale, Houppier, plasticité, besoin en lumière, ombre, cycle du carbone, séquestration du carbone, feuille, port de la plante, croissance, méthode statistique, écologie

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés libres : French Guiana, Tropical forest, Leaf lifespan, Crown depth, Shade tolerance, Self-shading, Morphological plasticity

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement
F60 - Physiologie et biochimie végétale
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

Agences de financement européennes : European Regional Development Fund

Projets sur financement : (EU) Population dynamics and managements of trees in French Guiana

Auteurs et affiliations

  • Laurans Marilyne, CIRAD-BIOS-UMR AMAP (FRA)
  • Vincent Grégoire, IRD (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/582996/)

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