Ecological site F044AP901MT

General information

Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.

MLRA notes

Major Land Resource Area (MLRA): 044A–Northern Rocky Mountain Valleys

Major Land Resource Area (MLRA): 044A–Northern Rocky Mountain Valleys
This MLRA includes the northern portion of the Northern Rocky Mountain Valleys Province of the Rocky Mountain System. The mountain valleys are deeply dissected and are typically bordered by mountains trending north to south. The nearly level broad flood plains are bordered by gently to strongly sloping terraces and alluvial fans. The surrounding mountains and in some areas the valleys experienced glaciation. The average precipitation is 12 to 16 inches generally, though can vary widely. The dominant soil orders are Inceptisols, Mollisols and Andisols. The valleys support coniferous forests, shrublands and grasslands.
Description of MLRAs can be found in: United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296.

Available electronically at: http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_053624#handbook

Classification relationships

ASSOCIATED HABITAT TYPES:
Major association with:
grand fir/queencup beadlily

Minor association with:
western hemlock/queencup beadlily

Ecological site concept

• Site does not receive any additional water
• Dominant Cover: Coniferous Forest
Reference vegetation community has an overstory dominated by Grand fir with an understory that can have diverse shrub and herbacous species and low to moderate moss. The understory production averages 800 dry pounds per acre. Understory species can include Calamagrostis rubescens, Carex geyeri, Clintonia uniflora, Coptis occidentalis, Holodiscus discolor, Linnaea borealis, Maianthemum stellatum, Oshorhiza berteroi, Physocarpus malvaceus, Pteridium aquilinum, Symphoricarpos albus. This site can also have a western hemlock dominant or mixed with western redcedar overstory, with an understory that has queencup beadlily and moderate moss cover. Ecological dynamics are the same with either overstory.
• Soils are
o Generally not limy (limited extent)
o Moderately deep, deep, or very deep
o Ashy or medial textural family
o Typically less than 5% stone and boulder cover (<15% max)
• Soil surface texture ranges from gravelly ashy silt loam to ashy silt loam in surface mineral 4”
• Parent material is volcanic ash over alluvium or outwash
• Drainage class is well drained; no flooding frequency
• Site Landform: stream terraces, outwash terraces, lake terraces
• Moisture Regime: udic
• Temperature Regime: frigid
• Elevation Range: 2200-3000 ft
• Slope: 0-15%

Associated sites

F044AP904MT	Upland Cool Moist Woodland Group This associated ecological site resides in areas with moister site conditions due to aspect, slope or other factors than this ecological site.

F044AP904MT

Upland Cool Moist Woodland Group

This associated ecological site resides in areas with moister site conditions due to aspect, slope or other factors than this ecological site.

Similar sites

F044AF001MT	Lower Subalpine Moderately Warm and Moist Coniferous Pend Oreille-Kootenai Valleys grand fir/bride's bonnet This is a similar ecological site that also has moister site conditions and has an overstory of grand fir but is limited to the LRU in the western most extent of this MLRA.

F044AF001MT

Lower Subalpine Moderately Warm and Moist Coniferous Pend Oreille-Kootenai Valleys grand fir/bride's bonnet

This is a similar ecological site that also has moister site conditions and has an overstory of grand fir but is limited to the LRU in the western most extent of this MLRA.

Table 1. Dominant plant species

Tree	(1) Abies grandis (2) Larix occidentalis
Shrub	(1) Vaccinium membranaceum (2) Rubus parviflorus
Herbaceous	(1) Clintonia uniflora (2) Moss

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Physiographic features

• Site Landform: stream terraces, outwash terraces, lake terraces
• Elevation Range: 2200 to 3000 ft
• Slope: 0 to 15 percent

Table 2. Representative physiographic features

Landforms	(1) Valley > Lake terrace (2) Valley > Outwash terrace (3) Valley > Stream terrace
Elevation	671 – 914 m
Slope	0 – 15%
Water table depth	152 cm
Aspect	W, NW, N, NE, E, SE, S, SW

Climatic features

• Moisture Regime: udic
• Temperature Regime: frigid
• Representative Value (RV) of range of Mean Annual Precipitation: 24-34 inches
• Representative Value (RV) of range of Mean Average Annual Temperature: 43-45 degrees
• Representative Value (RV) of range of Frost Free Days: 70-105 days

Table 3. Representative climatic features

Frost-free period (characteristic range)	41-94 days
Freeze-free period (characteristic range)	95-131 days
Precipitation total (characteristic range)	305-483 mm
Frost-free period (actual range)	13-97 days
Freeze-free period (actual range)	75-133 days
Precipitation total (actual range)	279-508 mm
Frost-free period (average)	69 days
Freeze-free period (average)	111 days
Precipitation total (average)	381 mm

Characteristic range

Actual range

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Figure 1. Monthly precipitation range

Characteristic range

Actual range

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Figure 2. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 3. Monthly maximum temperature range

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Figure 4. Monthly average minimum and maximum temperature

Figure 5. Annual precipitation pattern

Figure 6. Annual average temperature pattern

Climate stations used

(1) WHITEFISH [USC00248902], Whitefish, MT
(2) KALISPELL 9 NNE [USC00244560], Kalispell, MT
(3) CRESTON [USC00242104], Kalispell, MT
(4) OVANDO 9 SSE [USC00246304], Helmville, MT
(5) DRUMMOND AVIATION [USW00024139], Drummond, MT
(6) STEVENSVILLE [USC00247894], Stevensville, MT
(7) TRIDENT [USC00248363], Three Forks, MT
(8) TOWNSEND [USC00248324], Townsend, MT

Soil features

• Soils are
o Generally not limy (limited extent)
o Moderately deep, deep, or very deep
o Ashy or medial textural family
o Typically less than 5 percent stone and boulder cover (less than15 percent max)
• Soil surface texture ranges from gravelly ashy silt loam to ashy silt loam in surface mineral 4 inches
• Parent material is volcanic ash over alluvium or outwash
• Drainage class is well drained; no flooding frequency

Table 4. Representative soil features

Parent material	(1) Alluvium (2) Outwash (3) Volcanic ash
Surface texture	(1) Gravelly, ashy silt loam (2) Ashy silt loam
Drainage class	Well drained
Soil depth	51 – 152 cm
Surface fragment cover >3"	0 – 15%

Interpretations

Animal community

Wildlife uses
Early seral phase has high forage potential for deer and elk, but minimal in other phases except for overwintering uses.

Livestock use is very low due to lack of palatable forage.

Hydrological functions

Generally confined to bottomlands and stream sides, therefore functioning in streambank stability via soil stability. In timber management harvests, areas directly in streamside zones are usually left intact (not harvested).

Recreational uses

hunting, fishing, hiking, camping, photography

Wood products

These stands, especially in the seral stages, have very high timber productivity. Potential for even aged stand management and regenerates readily with adequate seed source.

Supporting information

Other references

Hansen, Paul L. Classification and management of Montana's riparian and wetland sites. No. 54. Montana Forest and Conservation Experiment Station, School of Forestry, The University of Montana, 1995.

Pfister, Robert D., et al. "Forest habitat types of Montana." Gen. Tech. Rep. INT-GTR-34. Ogden, UT: US Department of Agriculture, Forest Service, Intermountain Forest & Range Experiment Station. 174 p. 34 (1977).

Contributors

Jay Skovlin
Stephanie Shoemaker

Approval

Kirt Walstad, 9/08/2023

Rangeland health reference sheet

Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.

Author(s)/participant(s)
Contact for lead author
Date	11/13/2024
Approved by	Kirt Walstad
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
Presence of water flow patterns:
Number and height of erosional pedestals or terracettes:
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Number of gullies and erosion associated with gullies:
Extent of wind scoured, blowouts and/or depositional areas:
Amount of litter movement (describe size and distance expected to travel):
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):

Dominant:

Sub-dominant:

Other:

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Average percent litter cover (%) and depth ( in):
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
Perennial plant reproductive capability:

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Natural ResourcesConservation Service

Ecological site F044AP901MT

Ashy Cool Moist Woodland Group

Last updated: 9/08/2023 Accessed: 11/13/2024

General information

MLRA notes

Classification relationships

Ecological site concept

Associated sites

Similar sites

Table 1. Dominant plant species

Natural Resources
Conservation Service

Last updated: 9/08/2023
Accessed: 11/13/2024