Browsing by Author "Goubi Mostefa"

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    Tarifs et tables de cubage d’arbres individuels du pin d’Alep, Pinus halepensis Mill., dans l’Aurès algérien
    (researchgate, 2019-01-15) Goubi Mostefa
    The aim of this study was to develop volume tables for individual Aleppo pine trees, Pinus halepensis Mill., in the Ouled-Yaâgoub pine forest in Algeria. Nine linear and non-linear functions were systematically adjusted to the data collected from 340 trees representing the different diameter and height classes and chosen from trees felled during final logging operations in the study site. The approach used to estimate the parameters of the different functions tested is based on linear and non-linear regression applying the ordinary and weighted least-squares technique. Numerical and graphical analyses mainly based on the distribution of residues and the precision of the volume tables obtained were used to compare the different functions tested. Two functions were selected to generate volume tables for individual trees in Algeria’s Ouled-Yaâgoub pine forest. The first is a single-entry table expressing volume as a function of tree diameter at a height of 1.30 m; the second is a double-entry table expressing volume as a function of tree diameter at a height of 1.30 m and total tree height. The adjusted determination coefficients and residual least squares obtained with these two functions or tables are respectively 0.944 and 109.78 dm3 for the first and 0.977 and 69.69 dm3 for the second. Finally, to manage the Ouled-Yaâgoub forest efficiently, the estimation of standing Aleppo pine timber must also consider the aim of management operations. The single-entry volume table, which is easier to produce, can be used for forestry operations such as thinning, while the double-entry table, which is more accurate, can be used for the final logging cut to produce marketable timber, for which the volume estimations have to be more accurate.