Tarifs et tables de cubage d’arbres individuels du pin d’Alep, Pinus halepensis Mill., dans l’Aurès algérien
No Thumbnail Available
Date
2019-01-15
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
researchgate
Abstract
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.