A process-based growth model (PBM) for even-aged stands is presented which is based on photosynthesis relationships and provides predictions in terms of tree dimensions. The model has been simplified with only the most essential aspects of photosynthesis, physiology, and tree structure included. As a result, the model has fewer parameters than a typical PBM. Some of these parameters are aggregation of physiological and biometrical constants and thus summarize the effect on stand growth of many PBM parameters. Problems arising in estimating the parameters of a PBM are discussed, using the present model as an example. Finally, an example of calibrating the present model for different sites using typical measurements of stand growth is presented.
Bibliographical noteFunding Information:
This study was accomplished as a part of project PRY 35 at the Finnish Forest Research Institute, it was also supported by College of Natural Resources and the Agricultural Experiment Station, University of Minnesota through project MIN-42-044. Data were made available by Cooperative Agreement between the North Central Forest Experiment Station, St. Paul, MN and the University of Minnesota (23-87-05). Acknowledgment is given to the many researchers who helped to create the long measurement history for these plots.