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Within-stand and seasonal variations of specific leaf area in a clonal Eucalyptus plantation in the Republic of Congo

Nouvellon Yann, Laclau Jean-Paul, Epron Daniel, Kinana Antoine, Mabiala André, Roupsard Olivier, Bonnefond Jean-Marc, Le Maire Guerric, Marsden Claire, Bontemps Jean-Daniel, Saint André Laurent. 2010. Within-stand and seasonal variations of specific leaf area in a clonal Eucalyptus plantation in the Republic of Congo. Forest Ecology and Management, 259 (9) : pp. 1796-1807.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : FORESTRY

Abstract : Specific leaf area (SLA; m2 leaf kg_1 leaf) is a key ecophysiological parameter influencing leaf physiology, photosynthesis, and whole plant carbon gain. Both individual tree-based models and other forest process-based models are generally highly sensitive to this parameter, but information on its temporal or within-stand variability is still scarce. In a 2-4-year-old Eucalyptus plantation in Congo, prone to seasonal drought, the within-stand and seasonal variability in SLA were investigated by means of destructive sampling carried out at 2-month intervals, over a 2-year period. Within-crown vertical gradients of SLA were small. Highly significant relationships were found between tree-average SLA (SLAt) and tree size (tree height, Ht, or diameter at breast height, DBH): SLAt ranged from about 9 m2 kg_1 for dominant trees to about 14-15 m2 kg_1 for the smallest trees. The decrease in SLAt with increasing tree size was accurately predicted from DBH using power functions. Stand-average SLA varied by about 20% during the year, with lowest values at the end of the 5-month dry season, and highest values about 2-3 months after the onset of the wet season. Variability in leaf water status according to tree size and season is discussed as a possible determinant of both the within-stand and seasonal variations in SLA. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus, Variation saisonnière, Surface foliaire, Plantations, biomasse aérienne des arbres, Dimension, Allométrie, Modélisation des cultures, Modèle mathématique, Croissance, Physiologie végétale

Mots-clés géographiques Agrovoc : Congo

Classification Agris : F62 - Plant physiology - Growth and development
K10 - Forestry production
U10 - Computer science, mathematics and statistics

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Nouvellon Yann, CIRAD-ES-UPR Ressources forestières (FRA)
  • Laclau Jean-Paul, CIRAD-PERSYST-UPR Ecosystèmes de plantations (BRA) ORCID: 0000-0002-2506-214X
  • Epron Daniel, INRA (FRA)
  • Kinana Antoine, UR2PI (COG)
  • Mabiala André, UR2PI (COG)
  • Roupsard Olivier, CIRAD-PERSYST-UPR Ecosystèmes de plantations (CRI)
  • Bonnefond Jean-Marc, INRA (FRA)
  • Le Maire Guerric, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0002-5227-958X
  • Marsden Claire, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA)
  • Bontemps Jean-Daniel, ENGREF (FRA)
  • Saint André Laurent, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/554178/)

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