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In an lUlffianaged woodland, forest development follows a
succession of periods of undisturbed natural growth, interrupted by
intermediate loss or damage of trees caused by fire or wind or
other natural hazards. In a managed woodland, the most important
periodic disturbances are the thinning operations, which are often
carried out at regular intervals and which usually have a
significant effect on the future evolution of the resource. Thus, a
realistic model of forest development includes both natural growth
and thinnings. The key to successful timber management is a proper
understanding of growth processes, and one of the objectives of
modelling forest development is to provide the tools that enable
foresters to compare alternative silvicultural treatments.
Foresters need to be able to anticipate the consequences of a
particular thinning operation. In most cases, total timber volume
is not a very appropriate measure for quantifying growth or yields,
or changes caused by thinning operations. Yield in economic terms
is defined by the dimensions and quality attributes of the
harvestable logs, and estimating timber products is a central issue
of production-oriented growth and yield research. Introduction 2
Growth modelling is also an essential prerequisite for evaluating
the consequences of a particular management action on the future
development of an important natural resource, such as a woodland
ecosystem.
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