TAILIEUCHUNG - Báo cáo khoa học: "Comparaison d’estimateurs de la ressource forestière tropicale basés sur plan de sondage et sur modèle compte tenu d’une post-stratification"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Comparaison d’estimateurs de la ressource forestière tropicale basés sur plan de sondage et sur modèle compte tenu d’une post-stratification. | 651 Ann. For. Sci. 56 1999 651-665 Inra Elsevier Paris Article original Comparaison d estimateurs de la ressource forestiere tropicale bases sur plan de sondage et sur modèle compte tenu d une post-stratification Hélène Dessard Cirad-foret Campus international de Baillarguet BP 5035 34 032 Montpellier Cedex 1 France Reọu le 17 décembre 1998 accepté le 16 juin 1999 Abstract - Comparison of design-based and model-based estimates for tropical forestry resource with post-stratification. Forest resource management planning provides today the guide line for harvesting the forest is cut in high yield units from which forest managers successively extract quantities of timber. Management mapping needs local assessment of the resource over the whole forest from a forest inventory. Prediction of the resource is made by two methods of kriging one is ordinary kriging and the other one named stratified kriging takes into account an auxiliary qualitative variable. Results obtained from these technics are compared with those yielded by classical sampling. Thanks to an exhaustively sampled area one can judge more objectively the suitability of each technique. If the total is similar for the different estimators variances obtained by kriging are smaller. The difference between ordinary and stratified kriging concerns the distribution of the estimation. Taking into account the stratification was not very efficient and it might be better to use survey estimators. 1999 Inra Editions scientifiques et medicales Elsevier SAS. management planning forest inventory kriging post-stratification Resume - L exploitation forestiere est aujourd hui guidée par un plan d amenagement c est-a-dire par un decoupage en grandes unites de la foret d oil 1 exploitant extrait successivement une certaine quantité de bois. L etablissement de ce plan passe en premier lieu par 1 estimation locale de la ressource sur 1 ensemble de la foret effectuee à partir d un inventaire forestier. La prevision de la .

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