Model Lengkung Bentuk Batang (Taper Curve) Pohon Jati (Tectona Grandis)
Abstract: Detailed information
on tree volume for fancy wood, such as teak, is important to estimate its
financial value. Therefore, a method of estimating stem volume in portion wise
is developed. The objective of this study was to apply a parabolic taper curve
in various tree strata. Data of stem diameter at any relative height were
collected from selected felled-tree samples according to stem quality both in
the state and community forests by section wise measurement. Regression
analysis was applied to estimate parameter and to test the suitability level of
the parabolic taper model. The results showed that parabolic taper model could
be used to describe the stem curve of clear bole stem in state forest and the
stem curve up to tree height with minimum diameter of ca. 10 cm. In the state
forest, the parabolic taper model was fit to medium and large diameter classes
or in the intermediate and dominant strata. For small diameter class or in
suppressed stratum, the model was not sufficiently fit. On the other hand, the
parabolic taper model was fit to all samples from community forests because the
samples comprised the stem of best quality from the stand. The parabolic taper
model was suitable to apply on high quality stems which were characterized with
healthy, cylindrical, and straight stem, high clear bole, and straight grain.
Keywords: teak, Tectona
grandis, stem quality, taper model
Penulis: Ronggo Sadono, Muhammad
Dimas Trisnomo, Askar
Kode Jurnal: jpkehutanandd090004
