Structuration d’un peuplement hétérogène au moyen d’éclaircies locales
نویسنده
چکیده
Local rules optimization in a mixed stand. We present a treemarking model based on local rules, which optimizes the structure of the stand. The stand is divided into plots with constant number of trees. A plot is described by the number of trees in diameter classes for each species. These variables are random variables and their probability law are modeled by a mixture of multinomial distributions of known parameters (or that have been estimated). Thinning objectives are to harvest given tree numbers in each class and to obtain a given joint distribution of two trees in the same plot. Each plot is thinned by using a rule. A rule ranks the trees in the plot according to some criterion and selects rank with certain probability. This criterion and these probabilities are the model parameters. They will be adjusted on objectives, taking into account the stand structure. The model is applied and validated on a mixed oak-beech stand. We present the obtained thinning strategy for each objective. We show the influence of the stand structure and of the weight given at global and local objectives on the optimum. In conclusion, extension of the model is discussed to be closer to the real sylvicultural practice. quantitative management / locale thinning / mixed stand structure / mixture of statistical distribution / order statistics
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