This web site is the home for research at Michigan Tech
involving the Forest Vegetation
Simulator (FVS), a forest vegetation modelling framework that
extensively in the United States and more recently in Canada. In
the United States 21 variants have been developed to
customize the model to regional conditions. Most of these variants are
based on the original FVS variant: the Prognosis
Stand Development (Wykoff et al. 1982),
developed by the USDA Forest Service for the northern Rocky Mountain
region of Idaho and western Montana, USA.
FVS Variants: versions of FVS, sometimes
quite different from
each other in internal structure, have been developed for most forest
types inthe US. Click on the map for more detail.
FVS in the
One of the variants that is not based on the
Prognosis Model is the
one used in the US Great
region. This variant uses a growth engine adapted from the TWIGS
model (The Woodsman's Ideal
Growth Projection System - Miner et al. 1988)
by the USDA Forest Service in the 1980's. This model is conceptually
quite different from the variants developed elsewhere. The Prognosis
and TWIGS growth engines were developed
independently, in different geographic regions and in response to
differently perceived needs.
The evolution of FVS
In Canada, the British
of Forests has adapted the Prognosis
engine for the Province. They have also developed a new FVS software
(called PrognosisBC) in metric units.
Recently, the TWIGS
based growth engine from the Lake States FVS variant has been adapted
for many Ontario forest
conditions (called FVSOntario). This approach was used because the Lake
States variant is the most proximal to the intended area of
application. Whether the Prognosis approach might be more
appropriate is not known, and examining this question is a goal of one
of the research projects underway at Michigan Tech.
The Prognosis individual tree basal area increment
sub-model (Wykoff 1990) is probably the most
component. Revsisions to this model to change the way climate is
represented have been proposed, and another project at Michigan Tech is
underway to refine this methodology.
To find out more, the first place to start is this
the research tab you
can find more information on FVS research projects underway at Michigan
Tech. Tools and Documents related to FVS research and development at
also available, and will be added as they are finalized.
The official USDA Forest Service web site for FVS
Many other useful links may be found
on our links page.