Year: 1982
Type: report
Abstract: Yield Data for Forest Planning 1 period will be too high.Conversely, a low yield estimate will lead to a lower cut than desired (Stage 1973a).5. Provide links to other biotic and hydrologic components of the ecosystem and to economic analysis procedures for selecting the most appropriate regimens of management.By maintaining individual-tree resolution throughout the period of simulated time, estimates of future interactions between the stand and other components of the ecosystem can be based on as much detail as is available from inventories of the present situation.The tree species, however, are only part of the vegetation.Shrub and herbaceous species also compete with the conifers and may be valued in their own right for forage and shelter for wildUfe.Therefore, we designed the Prognosis Model to provide linkages to submodels that predict understory development.An understory development submodel has been calibrated for the grand fir-cedar-hemlock ecosystems of northern Idaho.It provides sufficient detail about the total vegetation to facilitate estimates of effects on streamflow, quality of wildlife habitat, and forage production.What Management Silvicultural treatments that can be evaluated include stocking control, regeneration Actions can be methods, site preparation, and pest management.Represented?THE BASE MODEL Stocking control options can represent: 1 .Thinning from above or below to a user-specified residual basal area per acre.2. Thinning from above or below to a user-specified residual trees per acre.3. Removal of a user-specified segment of the d.b.h.distribution.4. Specific tree selection where cut or leave designations are entered on the input tree records.The user can combine options to implement special thinning strategies and, in addition, can control the species composition of the stand to favor desirable trees.EXTENSIONS AND Management activities that are not explicitly included in the stocking control options are USER SUPPLIED represented in two ways.One way uses extensions to the base model containing additional MODIFICATIONS submodels.The other way modifies the submodels for diameter growth, height growth, and mortality.To evaluate silvicultural treatments related to pest management, the Stand Prognosis Model must be linked to models that predict pest outbreak and development.Models for Douglas-fir tussock moth (Monserud and Crookston 1982) and mountciin pine beetle (Crookston and others 1978) are currently available, and a western spruce budworm model is under development by the CANUSA program.Within the grand fir-cedar-hemlock ecosystem, it is possible to simulate the establish- ment of seedlings following regeneration treatments.This requires, however, that the Prognosis Model be linked to a submodel that predicts regeneration estabhshment (Stage and Ferguson 1982).
DOI: 10.2737/int-gtr-133
Authors: W. Wykoff, Nicholas L. Crookston, Albert R. Stage, Intermountain Forest and Range Experiment Station (Ogden, Utah)
Institution: US Forest Service
Language: English
Subfield: Forestry
Domain: Life Sciences
SDG: Life on land
Open Access status: green
OpenAlex ID: W2226682846