Developpement d'un modele de type arbre applique a la croissance des peuplements feuillus irreguliers du sud de la Belgique

Lejeune, P.

Developpement d'un modele de type arbre applique a la croissance des peuplements feuillus irreguliers du sud de la Belgique | Development of a tree growth model for mixed irregular stands in southern Belgium

1996

Lejeune, P.

A model predicting circumference growth of individual trees has been developed for mixed irregular stands dominated by Fagus silvatica L. in southeastern Belgium. This model integrates simultaneously tree, stand, and growing site characteristics without considering distances between individual trees. It has a determination coefficient of 40.1% and a residual standard deviation of 0.45 cm/year. Forest mensuration variables considered in the model are circumference, tree social position represented by the total basal area of trees greater than the subject tree, stand basal area, and some index of stand structure corresponding to the ratio of the variance over the mean circumference. The site component is essentially expressed by the length of the growing period. The low accuracy obtained for individual tree growth is relative because the results are used mainly after individual trees have been distributed into size classes. We have been able to show that the introduction of crown description in the model can increase its accuracy. But this modification requires a submodel describing crown changes over time.

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