Ecological site F044AY503WA

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): 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 44A01 (Spokane-Rathdrum Outwash Plains). Also found in adjacent areas of 43A04 and 44A02.

Classification relationships

Relationship to Other Established Classifications:
United States National Vegetation Classification (2008) – A3362 Abies grandis – Pseudotsuga menziesii Central Rocky Mountain Forest & Woodland Alliance
Washington Natural Heritage Program. Ecosystems of Washington State, A Guide to Identification, Rocchio and Crawford, 2015 – Northern Rocky Mountain Mesic Montane Mixed Conifer Forest
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 – 15x Okanogan Highland Dry Forest, 15y Selkirk Mountains, 15v Northern Idaho Hills and Low Relief Mountains.
This ecological site includes the following USDA Forest Service Plant Association: ABRG/PHMA, (Williams et. al. 1995)

Ecological site concept

This ES group is distinguished by an overstory of grand fir and Douglas-fir and an understory shrub component of ninebark, oceanspray, snowberry and /or twinflower. It occurs on loamy foothills, and terraces that have a water table within 30 inches of the soil surface during the growing season. This ES group fits into the National Vegetation Standard’s Grand Fir - Douglas-fir Central Rocky Mountain Forest & Woodland Alliance and Washington State’s Natural Heritage Program’s Northern Rocky Mt. Mesic Montane Mixed Conifer Forest.

Associated sites

R044AY501WA	Mesic, Aquic, Organic Depressions and Seeps Found on floodplains and seeps at lower elevation. Confined to depressions and other areas of water accumulation; water table at 0 to 6 inches with mucky surface texture. Site vegetation is dominated by a mix of wetland adapted species including Spiraea, Alnus viridis , Carex, and Sphagnum
F043AY521WA	Warm-Frigid, Moist- Xeric Loamy Foothills/Mountainsides, ashy surface (Grand Fir Warm Dry Shrub) Abies grandis - Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus Found on lower Hill slopes, mountain slopes and terraces. Textures are loamy and sites lack a high water table. The soil surface has a distinct layer of volcanic ash material. Overstory species include Abies grandis and Pseudotsuga menziesii var. glauca. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Hieracium albiflorum.
F043AY519WA	Warm-Frigid, Xeric, Loamy Slopes, low AWC subsoils (Douglas-Fir/Warm Dry Shrub) Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus Sites are on warm, dry aspects of hills and mountains. They are usually less about 30 inches deep with abundant rock fragments in the profile. Surfaces have some weak volcanic ash influence. Overstory species include Pseudotsuga menziesii var. glauca, and Pinus ponderosa. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Bromus vulgaris.

R044AY501WA

Mesic, Aquic, Organic Depressions and Seeps

Found on floodplains and seeps at lower elevation. Confined to depressions and other areas of water accumulation; water table at 0 to 6 inches with mucky surface texture. Site vegetation is dominated by a mix of wetland adapted species including Spiraea, Alnus viridis , Carex, and Sphagnum

F043AY521WA

Warm-Frigid, Moist- Xeric Loamy Foothills/Mountainsides, ashy surface (Grand Fir Warm Dry Shrub) Abies grandis - Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus

Found on lower Hill slopes, mountain slopes and terraces. Textures are loamy and sites lack a high water table. The soil surface has a distinct layer of volcanic ash material. Overstory species include Abies grandis and Pseudotsuga menziesii var. glauca. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Hieracium albiflorum.

F043AY519WA

Warm-Frigid, Xeric, Loamy Slopes, low AWC subsoils (Douglas-Fir/Warm Dry Shrub) Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus

Sites are on warm, dry aspects of hills and mountains. They are usually less about 30 inches deep with abundant rock fragments in the profile. Surfaces have some weak volcanic ash influence. Overstory species include Pseudotsuga menziesii var. glauca, and Pinus ponderosa. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Bromus vulgaris.

Similar sites

F043AY522WA	Warm-Frigid, Moist- Xeric Loamy Foothills/Mountainsides, mixed ash surface (Grand Fir Warm Dry Shrub) Abies grandis - Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus Found on hill and mountain side slopes adjacent to valleys. Lack a high water table. Overstory species include Abies grandis and Pseudotsuga menziesii var. glauca. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Hieracium albiflorum.
F044AY506WA	Warm-Frigid, Xeric, Loamy, Foothills and Stream Terraces, High Water Table (Douglas-Fir Warm Dry Shrub) Found on lower warmer terraces and foot slopes having a water table within 20 to 30 inches of the ground surface in spring. Overstory species are Pseudotsuga menziesii var. glauca and Pinus ponderosa. The understory is typified by Symphoricarpos albus, Physocarpus malvaceus, Carex, and Calamagrostis rubescens.

F043AY522WA

Warm-Frigid, Moist- Xeric Loamy Foothills/Mountainsides, mixed ash surface (Grand Fir Warm Dry Shrub) Abies grandis - Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus

Found on hill and mountain side slopes adjacent to valleys. Lack a high water table. Overstory species include Abies grandis and Pseudotsuga menziesii var. glauca. The understory is typified by Physocarpus malvaceus, Symphoricarpos albus, Calamagrostis rubescens, and Hieracium albiflorum.

F044AY506WA

Warm-Frigid, Xeric, Loamy, Foothills and Stream Terraces, High Water Table (Douglas-Fir Warm Dry Shrub)

Found on lower warmer terraces and foot slopes having a water table within 20 to 30 inches of the ground surface in spring. Overstory species are Pseudotsuga menziesii var. glauca and Pinus ponderosa. The understory is typified by Symphoricarpos albus, Physocarpus malvaceus, Carex, and Calamagrostis rubescens.

Table 1. Dominant plant species

Tree	(1) Abies grandis (2) Pseudotsuga menziesii var. glauca
Shrub	(1) Physocarpus malvaceus (2) Symphoricarpos albus
Herbaceous	(1) Calamagrostis rubescens (2) Hieracium albiflorum

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Physiographic features

Physiographic Features
Landscapes: Foothills, Valleys
Landform: outwash terraces, lake terraces and outwash plains

Elevation (m): Total range = 495 to 1185 m
(1,625 to 3,885 feet)
Central tendency = 645 to 860 m
(2,115 to 2,820 feet)

Slope (percent): Total range = 0 to 40 percent
Central tendency = 1 to 15 percent

Table 2. Representative physiographic features

Landforms	(1) Foothills > Hillslope (2) Valley > Outwash terrace
Flooding frequency	None
Ponding frequency	None
Elevation	645 – 860 m
Slope	1 – 15%
Water table depth	53 cm
Aspect	W, SE, S, SW

Table 3. Representative physiographic features (actual ranges)

Flooding frequency	None
Ponding frequency	None
Elevation	495 – 1,184 m
Slope	0 – 40%
Water table depth	41 – 76 cm

Climatic features

Climatic Features
Frost-free period (days): Total range = 95 to 130 days
Central tendency = 110 to 120 days

Mean annual precipitation (cm): Total range = 355 to 1065 mm
(14 to 42 inches)
Central tendency = 555 to 760 mm
(22 to 30 inches)

MAAT (C): Total range = 4.8 to 9.3
(41 to 49 F)
Central tendency = 6.7 to 8.0
(44 to 46 F)

Climate Stations: CHEWELAH, CHEWELAH MTN LOOKOUT, Teepee Seed Orchard

Table 4. Representative climatic features

Frost-free period (characteristic range)	110-120 days
Freeze-free period (characteristic range)
Precipitation total (characteristic range)	559-762 mm
Frost-free period (actual range)	95-130 days
Freeze-free period (actual range)
Precipitation total (actual range)	356-1,067 mm

Soil features

Representative Soil Features

This ecological subsite is associated with several soil series (e.g. Kegel, Mokins, Fan Lake, Dalkena, Wolfeson, Martella). The soil components can be grouped into: Fluvaquentic Haploxerolls, Andic Haploxeralfs, Vitrandic Haploxerepts, and Oxyaquic Vitrandic Haploxerepts. These soils have developed in thin or mixed Mazama tephra deposits over glaciolacustrine, outwash and alluvium 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: outwash, glaciolacustrine material and alluvium
Origin: unspecified

Fragment content of surface: 0 to 6 percent (median = 1%)

Subsurface Texture Group: Loamy
Fragment content of subsurface (25 to 100cm): 0 to 23 percent (median = 2%)
Most components lack surface fragments
Drainage Class: Moderately Well drained and Somewhat Poorly drained
Saturated Hydraulic conductivity: Moderately high to High
Soil Depth: 68% of components have no restriction within 150 cm
Abrupt textural change when present is at 56 to 76 cm (median = 56 cm)
Calcium Carbonate Equivalent (percent): 0 to 3 (median = 0)
Soil Reaction (1:1 Water): 4.8 to 7.3
Available Water Capacity (total in 100cm): 13.74-19.58cm (median = 15.64 cm)

Table 5. Representative soil features

Parent material	(1) Volcanic ash (2) Outwash (3) Alluvium (4) Glaciolacustrine deposits
Surface texture	(1) Ashy very fine sandy loam (2) Ashy fine sandy loam (3) Ashy silt loam
Drainage class	Somewhat poorly drained to moderately well drained
Depth to restrictive layer	381 – 508 cm
Soil depth	Not specified

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	12/22/2024
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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Ecological site F044AY503WA

Warm-Frigid, Moist- Xeric Loamy Foothills/Mountainsides, high water table (Grand Fir Warm Dry Shrub) Abies grandis - Pseudotsuga menziesii / Physocarpus malvaceus - Symphoricarpos albus

Last updated: 9/07/2023 Accessed: 12/22/2024