Vitrandic Hills and Mountains 30-45" PZ Frigid Western Bitterroot Foothills
Scenario model
Current ecosystem state
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Management practices/drivers
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- Transition T1A More details
- Transition T1B More details
- Restoration pathway R2A More details
- Restoration pathway R3A More details
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No transition or restoration pathway between the selected states has been described
Target ecosystem state
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Description
This state is dependent on fire severity and time intervals of fire. Many tree species will grow on this moist grand fir site. Douglas-fir, western larch, western white pine, ponderosa pine, lodgepole pine, Engelman spruce, and grand fir are the major conifer species. Quaking aspen, paper birch and black cottonwood can also be present. This ecological site has good forest productivity for Douglas-fir, western larch, and ponderosa pine. In N. Idaho western white pine would have good productivity. Low severity frequent fires create open stands of larch, Douglas-fir, ponderosa pine, and lodgepole pine. Mixed severity fires create a mosaic of a variety of tree species and different age groups. Tree regeneration after stand replacing fires will be variable depending on seed source. Western larch, western white pine, Douglas-fir, ponderosa pine, and lodgepole pine will be the main species. Western white pine used to play a major role in regeneration, however, the white pine blister rust has reduced its occurrence in regenerating stands. Western larch, Douglas-fir, and ponderosa pine are more prevalent. Reoccurring severe fires in the stand initiation phase can create shrub fields of ceanothus spp., and a variety of other shrubs. Fire exclusion for long periods allow the forest to move to an all aged grand fir, Douglas-fir, and Engelmann spruce stand. Root rot and defoliating insects then becomes are concern in the grand fir and Douglas-fir causing much downed wood and fuel loads.
Characteristics and indicators
Plant List
Overstory Trees
Douglas-fir (Pseudotsuga menziesii )
Western Larch (Larix occidentalis)
Grand fir (Abies grandis)
Understory trees
Grand fir (Abies grandis)
Understory Shrubs
Douglas maple (Acer glabrum Douglasii)
Western prince’s pine (Chimaphila umbellata)
Serviceberry (Almalachier alinofolia)
Oregon grape (Berberis aquifolium)
Snowberry (Symphoricarpos albus)
Twinflower (Linnaea borelalis)
Pachistima (Pachistima myrsinities)
Ninebark (Physocarpus malvaceus)
Oceanspray (Holodiscus discolor)
Shiny leaf spirea (Spirea betulifolia)
Big huckleberry (Vaccinium membranaceum) (cooler sites)
Scouler willow (Salix scouleriana)
Utah honeysuckle (Lonicera utahensis)
Mountain ash (Sorbus scopulina) (cooler sites)
Understory Herbs
Pathfinder (Adenocaulon bicolor)
Sweetroot (Osmorihiza chilensis)
Starry solomonplume (Smilacina stellata)
Queencup beadlily (Clintonia uniflora)
White hawkweed (Hieracium albiflorum)
Western meadowrue (Thalictrum occidentale)
Submodel
Description
An all aged stand of grand fir and Douglas-fir with Engelmann spruce mixed in occurs when fire interval is extended 100 years or more. Grand fir will dominate the regeneration in the understory. In the drier areas of this site root rot and defoliating insects can be a problem. Snags and downed wood will be common in these areas. This state will be susceptible to stand replacing fires.
Submodel
Mechanism
100+ years of fire exclusion will move the site to a mature grand fir – Douglas-fir site.
Mechanism
Successive severe burns kill regeneration and maintaining sprouting shrubs dominance.
Mechanism
Overstory management with ground burning will favor seral species.
Model keys
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Ecological sites
Major Land Resource Areas
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.