1. General Model Information

Name: Forest Vegetation Simulator

Acronym: FVS

Main medium: terrestrial
Main subject: forestry,biogeochemistry
Organization level: ecosystem
Type of model: not specified
Main application: decision supprot/expert system, research, education
Keywords: forest stand development


Forest Management Service Center
Natural Resources Research Center
2150A Centre Avenue, Suite 341A
Fort Collins, CO 80526-1891

Phone: (970)295-5000
Fax: (970)295-5755
email: wo_ftcol_fmsc@fs.fed.us
Homepage: http://www.fs.fed.us/fmsc/fvs/index.htm



The FVS Model
The Forest Vegetation Simulator (FVS) is an individual-tree, distance-independent growth and yield model. FVS will simulate growth and yield for major forest tree species, forest types, and stand conditions. FVS can also simulate a wide range of silvicultural treatments. Variants of FVS provide growth and yield models for specific geographic areas of the United States.
Prognosis is the original model that became the Forest Vegetation Simulator (Stage 1973). Stage developed Prognosis for use in the Inland Empire area of Idaho and Montana. In the early 1980s, the National Forest Timber Management Staff selected the individual-tree, distance-independent model form as the nationally supported framework for growth and yield modeling. The Timber Staff incorporated the Prognosis modular structure and capabilities into the national model framework. This model framework is the Forest Vegetation Simulator, or FVS.

The Growth and Yield Unit of the Forest Management Service Center (FMSC) in Fort Collins, Colorado, maintains, supports, develops, and provides training for FVS. The FMSC Growth and Yield staff performs a technology transfer role, working with researchers and National Forests staff from various geographical areas to incorporate their findings into the FVS framework.

Model Structure
The FVS model has several components that work together to simulate forest growth and management actions. There are three main growth components of the FVS: a large-tree model, a small-tree model, and an establishment model; and, there is a mortality model. FVS treats a stand as the population unit, using forest inventories or stand examination data. Input files include "keywords" that the user can manipulate to simulate different management scenarios (VanDyck 1999). There are extensions for FVS variants that estimate the influence of other agents upon tree growth, such as insects and disease. Post-processors are other programs that uses FVS output and for further reporting, display, or analysis.

Source of abstract: USDA Forest Service, FVS Model Description (10/2000): http://www.fs.fed.us/fmsc/fvs/index.htm

II. Technical Information

II.1 Executables:

Operating System(s): Windows


II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Van Dyck, Michael. 1999. Keyword Reference Guide for the Forest Vegetation Simulator. WO-TM Service Center, USDA Forest Service. Fort Collins, CO. September 1, 1996. 134 pp

Nicholas L. CrookstonForest Vegetation Simulator Overview and References

V. Further information in the World-Wide-Web

VI. Additional remarks

A documentation file (fvsdoc.exe) has been included. This file,when unzipped, is the release notes for version 6. The document is 150 pages and is in ASCII format. It is set to paginate and use condense print on an EPSON type printer.

Last review of this document by: J. Bierwirth 17. 10. 2000
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:43 CEST 2002

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