production of regional single-entry volume tables and development of raw wood product mix model for ontario
abstract
regional single-entry volume equations for northern
ontario were derived based on the standard volume equations
by honer et al. a site stratification methodology was
employed to derive localized regional height-diameter
equations. using this method, the variation of height
prediction for a given species within a region was greatly
reduced. thus, site specific equations were derived for each
species.
for stand data lacking tree height information, the
exponential function: height = b1 x exp (b2/dbh) proved best for
height prediction. this model was used to substitute height
in standard volume equations. in addition to the total volume
and gross merchantable volume based on top diameter and stump
height, the net merchantable volume based on age was also
derived.
stem profile equations were also fitted and used to
model wood product mixes. the results showed that max and
burkhart's model was the most accurate and precise model in
predicting top diameters and section heights along the bole,
while the model by demaerschalk performed better for volume
prediction. these stem profile equations demonstrated maximum
flexibility in dealing with the wood product mixes. by
combining the stem profile models and the single-entry volume
equations, a modelling system was developed to estimate wood
product mixes for stands based on dbh distributions. the wood
product mix model developed can be used at both the tree
level and stand level. a fortran program was written to
facilitate the calculations for modelling the combinations of
wood product mixes at the stand level.
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- retrospective theses [1604]