Preliminary Volume Table for Gmelina arborea in the Forest District of Subanjeriji, South of Sumatera
by
Djoko Wahjono
Haruni Krisnawati
Harbagung
The construction of tree volume table for Gmelina arborea in The Forest District of Subanjeriji, South Sumatera is aimed to improve the estimation standing-tree volume in forest inventory and to improve computing annual cutting as reguler.
Two kind of regression equation have been used for estimation of clearbole volume, namely v = f ( d ) and V = f( d, h), respectively, where : V= clearbole volume (m3), d= stem diameter at breast height (cm), h = high of crownbase (m). The use of the former volume table was construct by means of an assumed average stem form factor may cause a considerable error.
The regression equation have selected to construct tree volume tables were : log v = -2.9095 + 1.8487 log d -5.9698((1/d) and log v = -4.1744 log + 1.955log d + 0.7938 log h, with standard error of estimation of 8.96% and 6.05%. The use of height of crownbase besides of diameter at breast height as independent variable increases the precision of estimation of 2.91%.
For the requirement measurement of efficiency in forest inventory, however that may be for practical point of view it is suggested to use the volume tables constructed by using v = f (d).
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