On Sat, 4 Mar 1995, Naoto Matsumura wrote: > Usually, we can use Heyer's formula or Gehrhardt's formula > in age-classed even-aged forests. Are there any other suitable > formulae in such cases? Most forests that I know of (including even-aged forests) have dynamics that are too complicated to be represented by any approach that uses a formula. A forest consists of many different vegetation types that have complex successional patterns and varying responses to treatments. A formula-based approach also could not deal with the many different outputs and objectives related to multiple timber products, water quality, aesthetics, wildlife, recreation, etc. This means that you need a computerized modeling system that can represent this complexity. I am sure that many contributers to this list can suggest simulation or optimization modeling systems. My favourite system right now is one based on the Woodstock modeling system. Woodstock provides 3 approaches - inventory projection (deterministic simulation), stochastic simulation, or linear programming - to build a forest model for predicting yields (among other things). I can provide more information on Woodstock and related programs if you are interested. -- Hubert Burger T6LV@unb.ca Forestry and Environmental Management University of New Brunswick, Fredericton, N.B., Canada
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