Acacia cyanophylla Lindl. / modèles de régression / prédiction de biomasseAbstract -Above ground biomass prediction of Acacia cyanophylla Lindl. (Syn. A. saligna (Labill.) H. Wendl). Dimensional measurements were made on 45 four-year-old Acacia cyanophylla Lindl. shrubs which were cut at 20 cm above ground to predict biomass production. These shrubs planted at a density of 1100 plants/ha were located at the following sites: El Krib (high semi-arid), El Hojjaj (high semi-arid) and El Araïbia (humid) in the North West of Tunisia. In order to validate the regression models obtained, a subsample of 5 shrubs (not included in the total sample), representing 11% of the total sample was chosen at random. Linear regressions (simple and multiple) allowed to satisfactorly estimate the above ground biomass production of Acacia cyanophylla Lindl. using its volume or its basal diameter (R 2 = 0.76 to 0.96). However, the multiple regression involving simultaneously the volume and the basal diameter led to a better precision of the model (R 2 = 0.90 to 0.98).Acacia cyanophylla Lindl / regression models / biomass prediction Ann. For. Sci. 59 (2002) 335-340 335
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