© 2000 Heron Publishing—Victoria, Canada
Initializing a model stand for process-based projection
Harry T. Valentine (1), David A. Herman (1), Jeffrey H. Gove (1), David Y. Hollinger (1) and Dale S. Solomon (1)
1. USDA Forest Service, Northeastern Research Station, P.O. Box 640, Durham, NH 03824-0640, USA / Received October 13, 1998
Summary
A stand generation (or initialization) procedure is designed to furnish morphologically plausible model trees for process-based
projection. The steps of the initialization are: (i) the generation of the locations of model trees and the tessellation
of tree areas; (ii) the sampling of diameters from a target distribution and assignments of those diameters to model-tree
locations; (iii) the calculation of the height of each model tree from its assigned diameter and the distances to its neighbors;
(iv) the calculation of the crown length of each model tree from its height and distances to its neighbors; and (v) the recalculation
of diameter from height and crown length. Components of dry matter are calculated from the model-tree dimensions and pipe-model
theory. Process-based projection with the AMORPHYS model is discussed.
Keywords:
carbon balance, crown length, diameter, growth, height, modeling, pipe-model theory.
