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Above ground biomass prediction of Acacia cyanophylla Lindl. (Syn. A. saligna (Labill.) H. Wendl). Dimensional mea- surements were made on 45 four-year-old Acacia cyanophyllaLindl. 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 Araibia (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 cyanophyllaLindl. using its volume or its ba- sal 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).

annals of forest science

Pr�diction de la biomasse a�rienne d'<i>Acacia cyanophylla</i> Lindl. (Syn. <i>A. saligna</i> (Labill.) H. Wendl) � partir de mensurations dimensionnelles

Pr�diction de la biomasse a�rienne d'Acacia cyanophylla Lindl. (Syn. A. saligna (Labill.) H. Wendl) � partir de mensurations dimensionnelles