Ecological site F043AY528WA

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): 043A–Northern Rocky Mountains

Major land resource area (MLRA): 043A-Northern Rocky Mountains

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

LRU notes

Most commonly found in LRU 43A04 (Selkirk Mountains). Climate parameters were obtained from PRISM and other models for the area. Landscape descriptors are derived from USGS DEM products and their derivatives.

Classification relationships

Relationship to Other Established Classifications:

United States National Vegetation Classification (2008), A3612 Western Hemlock – Western Redcedar Cool-Mesic Central Rocky Mountain Forest & Woodland Alliance.

Washington Natural Heritage Program. Ecosystems of Washington State, A Guide to Identification, Rocchio and Crawford, 2015 - Northern Rocky Mt. Mesic Montane Mixed Conifer Forest (Cedar-Hemlock)

Description of Ecoregions of the United States, USFS PN # 1391, 1995 - M333 Northern Rocky Mt. Forest-Steppe-Coniferous Forest-Alpine Meadow Province
Level III and IV Ecoregions of WA, US EPA, June 2010 – 15y Selkirk Mountains, 15w Western Selkirk Maritime Forest.
This ecological site includes the following USDA Forest Service Plant Associations Western Redcedar Series: THPL/CLUN. (Williams et. al. 1995)

Ecological site concept

This ES group is distinguished by an overstory of western redcedar, grand fir and Douglas-fir and a diverse understory of shrubs such as woods rose and Utah honeysuckle; and herbs such as bride’s bonnet, Idaho goldthread and starry false solomon’s seal. It occurs on foothills, mountainsides, and ridges. Soils are loamy with volcanic ash influenced surfaces, water table at >30 inches depth and low available water holding capacity. This ES group fits into the National Vegetation Standard’s Tsuga heterophylla - Thuja plicata Cool-Mesic Central Rocky Mountain Forest & Woodland Alliance and Washington State’s Natural Heritage Program’s Northern Rocky Mountain Mesic Montane Mixed Conifer Forest.

Table 1. Dominant plant species

Tree	(1) Thuja plicata (2) Abies grandis
Shrub	(1) Paxistima myrsinites (2) Linnaea borealis ssp. longiflora
Herbaceous	(1) Clintonia uniflora (2) Viola orbiculata

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Physiographic features

Physiographic Features
Landscapes: Mountains, Valleys
Landform: mountain slopes, valley walls
Geomorphons: side slopes, toe slopes, foot slopes

Elevation (m): Total range = 540 to 1815 m
(1,770 to 5,955 feet)
Central tendency = 1060 to 1420 m
(3,475 to 4,660 feet)

Slope (percent): Total range = 0 to 100 percent
Central tendency = 35 to 60 percent

Water Table Depth (cm):
>200cm
>80 in

Flooding:
Frequency: None
Duration: None

Ponding:
Frequency: None
Duration: None

Aspect: (central tendency)
100-130-215

Table 2. Representative physiographic features

Landforms	(1) Valley > Valley side (2) Mountains > Mountain slope
Flooding frequency	None
Ponding frequency	None
Elevation	3,475 – 4,660 ft
Slope	35 – 60%
Aspect	E, SE, S, SW

Table 3. Representative physiographic features (actual ranges)

Flooding frequency	None
Ponding frequency	None
Elevation	1,770 – 5,955 ft
Slope	100%

Climatic features

Climatic Features
Frost-free period (days): Total range = 80 to 125 days
Central tendency = 90 to 105 days

Mean annual precipitation (cm): Total range = 650 to 1815 mm
(26 to 71 inches)
Central tendency = 860 to 1245 mm
(34 to 49 inches)

MAAT (C): Total range = 1.5 to 8.0
(35 to 46 F)
Central tendency = 4.0 to 5.7
(39 to 42 F)

Climate Stations: none

Soil features

Representative Soil Features

This ecological subsite is associated with areas mapped as Personcreek family and Humic Udivitrands. The soils are Typic Udivitrands and Humic Udivitrands. They have developed in thick Mazama tephra deposits over till from mixed sources. The soils are very deep and have adequate available water capacity to a depth of 1 m. The soils are mostly well-drained.

Parent Materials:
Kind: Tephra (volcanic ash)
Origin: mixed
Kind: till and alluvium
Origin: unspecified

Surface Texture: (<2mm fraction)
(1) Ashy-Silt loam

Fragment content of surface: 15 to 30 percent (median = 20%)

Subsurface Texture Group: Loamy to Sandy
Fragment content of subsurface (25 to 100cm): 50 to 85 percent (median = 70%)
Most components lack surface fragments
Drainage Class: Well drained
Saturated Hydraulic conductivity: Moderately high to Very High (median = Moderately High)
Soil Depth: no restriction within 150 cm
Calcium Carbonate Equivalent (percent): 0
Soil Reaction (1:1 Water): 4.5 to 6.5 (median = 5.8)
Available Water Capacity (total in 100cm): 5.12 – 5.63cm (median = 5.12 cm)

Table 4. Representative soil features

Parent material	(1) Volcanic ash (2) Alluvium (3) Till
Surface texture	(1) Ashy silt loam
Drainage class	Well drained
Permeability class	Moderate
Available water capacity (0-40in)	2 in
Calcium carbonate equivalent (0-40in)	Not specified
Soil reaction (1:1 water) (0-60in)	5.8
Subsurface fragment volume <=3" (10-40in)	70%

Table 5. Representative soil features (actual values)

Drainage class	Well drained
Permeability class	Moderate to rapid
Available water capacity (0-40in)	2 – 2.2 in
Calcium carbonate equivalent (0-40in)	Not specified
Soil reaction (1:1 water) (0-60in)	4.5 – 6.5
Subsurface fragment volume <=3" (10-40in)	50 – 85%

Interpretations

Wood products

Forest Site Productivity

Species Average Site Index Culmination of Mean Annual Increment SI Reference

Grand fir 79 140 031 (Cochran, 50 yr BH)
Western Larch 53 69 265 (Schmidt, 50 yr TA)
Lodgepole Pine 105 100 520 (Alexander, 100 TA)
Western White Pine 81 152 570 (Haig, 50 yr TA)
Ponderosa Pine 104 114 600 (Meyer, 100 yr TA)
Douglas-fir 89 93 031 (Cochran, 50 yr BH)
Douglas-fir 75 92 771 (Monserud, 50 yr BH)

Supporting information

References

Zack, A. 1997. Biophysical Classification- Habitat Groups and Description of Northern Idaho and Northwestern Montana, Lower Clarkfork and Adjacent Areas..
Cooper, S.V., K.E. Neiman, R. Steele, and D.W. Roberts. 1991. Forest Habitat types of Northern Idaho, A Second Approximation.
. 2017. NRCS Soil and Site Index data for NE WA and N. Idaho.
Williams, C.K., B.F. Kelley, B.G. Smith, and T.R. Lillybridge. October, 1995. Forested Plant Associations of the Colville National Forest.
. October, 1995. Idaho Department of Lands H.T. Groupings based on Forest HTs of Northern Idaho.
Miller and Gravelle. October, 2005. Species Selection Guidelines for Planting, Natural Regeneration and Crop Tree Selection on Potlatch Land in Northern Idaho, Forestry Technical Paper TP -2003-1.
McDonald, G.L., A.E. Harvey, and J.R. Tonn. 2000. Fire, Competition, and Forest Pests: Landscape Treatment to Sustain Ecosystem Functions, The Joint Fire Science Conference and Workshop.. Pages 195–211 in Proceedings from the Joint Fire Science Conference and Workshop: crossing the millennium: integrating spatial technologies and ecological principles for a new age in fire management.
Zack, A. 1994. Early Succession in Western Hemlock Habitat Types of Northern Idaho.

Approval

Curtis Talbot, 10/14/2020

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	09/09/2022
Approved by	Curtis Talbot
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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Ecological site F043AY528WA

Warm-Frigid, Udic, Loamy Foothills/Mountainsides, low AWC subsoils (western redcedar, moist herb) Thuja plicata / Clintonia uniflora

Last updated: 10/14/2020 Accessed: 11/21/2024