Effects Of A Thinning Regime On Stand Growth
In Plantation Forests Using An Architectural
Stand Growth Model
Author(s)
Y. Chiba
Abstract
The architectural form of a tree results from a combination of its physiology and
mechanical support requirements. Using mathematical models of tree
architecture that describe the mechanical relationships between different tree
organs, a forest growth model was developed to predict the effect of thinning
operations on tree/stand growth. The model is based on the height growth of
trees, which is strongly correlated with forest site condition. The crown form of a
tree alters as a result of available growing space within the stand, which, thus,
affects crown depth. The parameter crown depth is a key characteristic for
quantifying individual tree growth in order to reflect the effect of the thinning
regime in plantation forests. The applicability of the model was verified using
real stand growth data under various thinning regimes. Since the model includes
not only the crown form but also the stem form of individual trees, we can
predict tree size (clear bole length, stem diameter, ring width), stem shape, tree
weight and stand biomass over the course of stand development for a variety of
thinning operations. Without any thinning, the forest canopy will close at an
early growth stage, there will be a high stand density, and the crown depth will
be restricted and will exhibit poor growth. In contrast, forest plantations that are
exposed to a number of thinning operations, at an appropriate intensity and
timing, will exhibit the required biomass growth and wood quality. The effects
on CO2 fixation were also discussed with reference to thinning regimes in
plantation forests.
Keywords: biomass increment, NPP, stand density control, biomass allocation,
tree architecture.
Keywords
biomass increment, NPP, stand density control, biomass allocation,
tree architecture.
Related Book
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