L'accroissement annuel réel dans les modèles de simulation de peuplements forestiers

Abstract

The use of 'real' annual increment rather than current annual increment is suggested for forest simulation models. A method of calculation of real annual diameter increment is described as a function of age and present tree diameter. This method is based on a convergent recursive algorithm using current annual growth rate as an initial value. The possibility of calculating an unbiased real annual increment based on increment core data is demonstrated. The second part of the article consists of an application of the method to a data bank involving more than 1000 black spruce (Piceamariana Mill. B.S.P.) for which a matrix of current and real annual increments was calculated. Subsequently, the development of an average stem was simulated by different methods for purposes of comparison.