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Development and evaluation of ecoregion-based jack pine height-diameter models for Ontario

Publication: The Forestry Chronicle
August 2002

Abstract

The Chapman-Richards growth function is used to model jack pine (Pinus banksiana Lamb.) tree height-diameter relationships at provincial, regional, and ecoregional levels. The results suggest that the tree height-diameter relationships of jack pine are significantly different among the geographic regions of Ontario, depending on local climatic, soil, and ecological conditions. In light of this study, the provincial and regional height-diameter models are not appropriate for predicting tree heights at the ecoregional level. Further, applying a specific ecoregional model to other ecoregions will also result in significant biases for predicting local tree heights. The ecoregion-based height-diameter models developed in this study may provide more accurate information on tree growth and development to forest resource managers and planners. Key words: Chapman-Richards growth function, permanent sample plot, non-linear extra sum of square method, forest management

Résumé

La fonction de croissance Chapman-Richards est utilisée pour modéliser les relations entre la hauteur de l'arbre et son diamètre chez le pin gris (Pinus banksiana Lamb.) au niveau provincial, régional et écorégional. Les résultats laissent entendre que les relations entre la hauteur et le diamètre de l'arbre chez le pin gris sont significativement différentes entre les régions géographiques de l'Ontario, selon les conditions climatiques, pédologiques et écologiques locales. À la lumière de cette étude, les modèles provinciaux et régionaux de relations entre la hauteur et le diamètre ne sont pas appropriés pour prédire la hauteur des arbres au niveau écorégional. De plus, l'utilisation d'un modèle écorégional spécifique aux autres écorégions entraînera également des biais importants dans la prédiction de la hauteur des arbres locaux. Les modèles hauteur-diamètre en fonction de l'écorégion élaborés dans cette étude pourraient fournir une information plus précise sur la croissance et le développement des arbres aux aménagistes forestiers et aux planificateurs. Mots-clés : fonction de croissance Chapman-Richards, parcelle-échantillon permanente, méthode de la somme des carrés non-linéaires, aménagement forestier

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cover image The Forestry Chronicle
The Forestry Chronicle
Volume 78Number 4August 2002
Pages: 530 - 538

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Version of record online: 21 March 2011

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