Abstract
Abstract A whole-stand model, Simulation Of Stands (SOS), was developed for even-aged Douglas-fir (Pseudotsuga menziesii var. glauca) stands in the inland Northwest. The model consists of three new components: (1) volume prediction model, (2) basal area prediction model, and (3) survival model. Existing height growth models were used to estimate stand top height growth. The behavior and performance of SOS were evaluated by simulating stand development over time under alternative conditions and comparing the results with growth and yield concepts suggested in the literature. The predicted stand attributes from SOS were also compared with predictions from the Stand Prognosis Model and Stand Projection System (SPS). SOS behavior was similar to Prognosis for lower site indices, but more like SPS for higher site indices. The three models differed mainly with respect to stand top height growth and tree survival. West. J. Appl. For. 8(4):120-125.
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