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Effects of competitor spacing in individual-tree indices of competition

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Abstract:

All indices of competition represent effects of distance between competing trees. However, the functional forms of these distance relations differ, because distance interacts with tree size in the many of the indices. In particular, some of the newer indices use vertical angles and crown geometry to define the effect of separation implicitly. Graphical displays showing effects of distance between subject tree and a competitor in published distance-dependent indices of competition are presented to permit visual comparisons of the indices. Nine pairs of subject and competitor crown classes are included for each index. Relation of these distance functions to the function implicit in distance-independent (stand-level) variables included in the growth prediction model is discussed.

Tous les indices de compétition traduisent les effets de la distance entre les arbres qui sont en compétition. Cependant, les formes fonctionnelles de ces relations basées sur la distance diffèrent parce que la distance interagit avec la dimension des arbres dans plusieurs de ces indices. Certains des indices les plus récents, en particulier, utilisent des angles verticaux et la géométrie de la cime pour définir de façon implicite l'effet de séparation. Des représentations graphiques illustrant les effets de la distance entre un sujet et un compétiteur dans les indices de compétition publiés qui sont basés sur la distance sont présentées permettant ainsi une comparaison visuelle de ces indices. Neuf paires de classe de cime pour le sujet et le compétiteur sont incluses pour chaque indice. La relation de ces fonctions basées sur la distance avec la fonction implicite dans les variables indépendantes de la distance (à l'échelle du peuplement) incluses dans le modèle de prédiction de la croissance est discutée.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2001

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