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Predicting crown class in three western conifer species

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Abstract:

Assessing the crown class (dominant, codominant, intermediate, suppressed) of a tree is a subjective procedure. Most definitions of crown class are based on the relative height of a tree and (or) the amount of light that is incident on the tree crown. With this research, we devised a classification scheme, based on easily measured tree variables, to assign a crown class to trees. Our data consisted of tree measurements, including crown class, from four stem-mapped 0.05-ha sample plots with buffers. The light model tRAYci was used to assess the light incident on each tree crown. These data gave us field-based and light-based assessments of crown class. The classification and regression tree technique — with diameter at breast height (DBH), height, relative DBH, relative height, height to the crown base, and crown depth as variables — was used to classify the trees. Accuracy rates of 91% and 82% were achieved for the field-based and light-based assessments of crown class, respectively.

L'évaluation de la classe de cime (dominante, codominante, intermédiaire ou opprimée) d'un arbre est une procédure subjective. La plupart des définitions de la classe de cime sont basées sur la hauteur relative d'un arbre ou sur la quantité de lumière incidente sur la cime de l'arbre. Les auteurs ont élaboré un mode de classification pour attribuer une classe de cime aux arbres sur la base de variables facilement mesurables chez les arbres. Nos données étaient constituées de mesures des arbres, incluant la classe de cime, provenant de quatre tiges dans des placettes cartographiées de 0,05 ha avec une zone tampon. Le modèle tRAYci a été utilisé pour quantifier la lumière incidente sur chaque cime. Ces données nous ont permis d'obtenir une évaluation de la classe de cime basée soit sur les caractéristiques dendrométriques soit sur les conditions de lumière. Les arbres ont été classés en utilisant la technique de classification et de régression des arbres (CART) basée sur le DHP, la hauteur, le DHP relatif, la hauteur relative, la hauteur à la base de la cime et la longueur de la cime. Des précisions de 91 et 82 % ont été obtenues pour les classifications de la cime basées respectivement sur les caractéristiques dendrométriques et les conditions de lumière.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2004

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