Abstract
A model is required for accurate estimation of the merchantable volume of pedunculate oak (Quercus robur L.) trees in Galicia, northwestern Spain. Accordingly, the purpose of the present study was to obtain equations for predicting merchantable volumes and stem profiles of individual trees. For this reason, two compatible and four non-compatible volume systems were initially evaluated and fitted to data from 251 destructively sampled trees which were collected in stands located throughout the area of distribution of the species in Galicia. The outliers were removed to provide a data set of measurements from 3 090 sections, which was then available for fitting. A second-order continuous autoregressive error structure was used to account for autocorrelation. Comparison of the models was carried out using overall goodness-of-fit statistics and box plots of residuals against relative height or diameter class. The compatible volume system of Fang et al. [22] provided the best compromise in describing the stem profile and estimating merchantable height, merchantable volume and total volume and is therefore recommended for pedunculate oak stands in Galicia.
Résumé
Un modèle d’estimation précise du volume marchand du chêne pédonculé (Quercus robur L.) à l’échelle des individus en Galice au Nord-Ouest de l’Espagne était indispensable. En conséquence, cette étude a été réalisée pour obtenir des équations de prédiction du volume marchand et du profil de tronc d’arbres individuels. Pour cela, deux modèles compatibles et quatre modèles non compatibles de volume ont été analysés et comparés à un échantillon de 251 arbres récoltés dans des peuplements de la zone de distribution de l’espèce en Galice. Les données extrêmes ont été éliminées pour fournir un ensemble de 3 090 sections disponibles pour l’étude. Une structure d’erreur auto-régressive continue a été utilisée pour prendre en compte l’autocorrélation. La comparaison des modèles a été réalisée en utilisant les statistiques de meilleur ajustement et les nuages de points des résidus comparés aux classes de hauteur relative ou de diamètre. Le système de volume compatible de Fang et al. [22] a fourni le meilleur compromis pour la description du profil de tronc et l’estimation de la hauteur marchande, du volume marchand et du volume total et son usage est donc recommandé pour les peuplements de chêne pédonculé en Galice.
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Barrio Anta, M., Diéguez-Aranda, U., Castedo-Dorado, F. et al. Merchantable volume system for pedunculate oak in northwestern Spain. Ann. For. Sci. 64, 511–520 (2007). https://doi.org/10.1051/forest:2007028
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DOI: https://doi.org/10.1051/forest:2007028