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Sources of within- and between-stand variability in specific leaf area of three ecologically distinct conifer species

Sources de variabilité intra et inter peuplements de la surface spécifique des aiguilles de trois espèce de conifère présentant des exigences écologiques contrastées

Annals of Forest Science volume 65, page 103 (2008)Cite this article

Abstract

Specific leaf area (SLA) is an important ecophysiological variable, but its variability within and between stands has rarely been simultaneously examined and modeled across multiple species. Extensive datasets on SLA in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco), hybrid spruce (Picea engelmannii Parry × Picea glauca (Moench) Voss × Picea sitchensis (Bong.) Carr.), and ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws.) were used to estimate variability of SLA within a canopy and its relationship to tree- and stand-level covariates, and to predict SLA at various locations in tree crowns. Also, in the case of hybrid spruce, variation in SLA due to different relative horizontal lengths from the bole was examined. In all species, SLA systematically increased from tree tip to crown base and decreased with foliage age class. Cardinal direction did not have a highly significant influence in either Douglas-fir or hybrid spruce, but SLA did significantly decrease from branch tip to bole in hybrid spruce. Tree- and stand-level (e.g. density, site index) factors had relatively little influence on SLA, but stand age did have a significant positive influence. For ponderosa pine, a significant relationship between canopy mean current-year SLA and carbon isotope discrimination was also found, suggesting the importance of water stress in this species. An equation was fitted to estimate SLA at various points in the canopy for each species and foliage age class using absolute height in the canopy, relative vertical height in the tree, and stand age.

Résumé

La surface spécifique des feuilles (SLA) est un paramètre écophysiologique important mais sa variabilité intra et inter-peuplements n’a jamais été examinée et modélisée sur des gammes larges d’espèces. Des jeux de données très détaillés de SLA de Douglas côtiers [Pseudotsuga menziesii var. menziesii (Mirb.) Franco], d’épicéas hybrides (Picea engelmannii Parry × Picea glauca (Moench) Voss × Picea sitchensis (Bong.) Carr), et de pins ponderosa (Pinus ponderosa Dougl. ex P. & C. Laws.) ont été mobilisés pour évaluer la variabilité de SLA dans une canopée. Les relations entre SLA et des covariables à l’échelle de l’arbre ou du peuplement ont été précisées, un modèle prédictif de SLA à différents niveaux dans les couronnes a été construit. Dans le cas de l’épicéa, l’impact de la distance de branche entre l’aiguille et le tronc a également été testé. Dans toutes les espèces, SLA augmentait systématiquement du sommet des arbres à la base de la couronne, et diminuait avec la classe d’âge des aiguilles. La direction cardinale n’avait guère d’influence sur SLA ni dans le cas du Douglas ni dans celui de l’épicéa; mais SLA diminuait systématiquement depuis l’extrémité des branches vers le tronc. Les facteurs arbre et peuplement (comme la densité, l’indice de productivité de la station) n’avaient que peu d’impact sur SLA alors que l’âge du peuplement avait un effet significatif et positif. Pour le pin ponderosa, une relation significative a été détectée entre la valeur moyenne de SLA des aiguilles de l’année et la discrimination isotopique du carbone, ce qui suggère l’impact des contraintes hydriques pour cette espèce. Un modèle de prédiction de SLA à différentes positions dans la canopée a été ajusté sur les données de chaque espèce et classe d’âge, en se basant sur la hauteur dans la canopée, la hauteur relative dans l’arbre et l’âge du peuplement.

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Authors and Affiliations

  1. School of Forest Resources, University of Maine, 04469, Orono, ME, USA

    Aaron R. Weiskittel

  2. Department of Forest Resources, Oregon State University, 97331, Corvallis, OR, USA

    Hailemariam Temesgen & Duncan S. Wilson

  3. Department of Forest Science, Oregon State University, 97331, Corvallis, OR, USA

    Douglas A. Maguire

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  1. Aaron R. Weiskittel
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  2. Hailemariam Temesgen
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  3. Duncan S. Wilson
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  4. Douglas A. Maguire
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Correspondence to Aaron R. Weiskittel.

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Weiskittel, A.R., Temesgen, H., Wilson, D.S. et al. Sources of within- and between-stand variability in specific leaf area of three ecologically distinct conifer species. Ann. For. Sci. 65, 103 (2008). https://doi.org/10.1051/forest:2007075

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Annals of Forest Science

ISSN: 1297-966X