Ecological site R043AY515ID

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.

LRU notes

Major land resource area (MLRA): 043A-Northern Rocky Mountains
Modal LRU – 43A01 - Okanogan Plateau

This LRU is composed predominantly of glaciated mountains and foothills. The soils tend to be loamy to sandy andisols, inceptisols, and mollisols with mixed or distinct ash surfaces. Recent alluvium, till, outwash and residuum from granitic or metamorphic rock are the dominant parent materials. Soil climate is a frigid or cryic temperature regime and xeric moisture regime with average annual precipitation around 450 mm (18 inches).

Classification relationships

This ES fits into the National Vegetation Standard’s Riparian & Seep Shrubland Group and is most closely related to Washington State’s Natural Heritage Program’s Rocky Mountain Subalpine-Montane Fen.

Ecological site concept

Ecological Site Concept:

This ES is found on very poorly drained valley floors. A water table is at the surface for much of the May-Oct period. They have cryic temperatures and a plant community dominated by willow, birch and sedges.

Table 1. Dominant plant species

Tree	Not specified
Shrub	(1) Salix farriae
Herbaceous	(1) Carex (2) Equisetum

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Physiographic features

Physiographic Features
This ecological site occurs mainly on valley floors in mountains. Parent materials are organic material over mixed alluvium or till.

Landscapes: Mountains
Landforms: mountain valleys, valley floors

Elevation:
Total range = 1155 to 1385 m
(3,795 to 4,445 feet)
Central tendency = 1195 to 1290 m
(3,920 to 4,230 feet)

Slope (percent):
Total range = 0 to 10 percent
Central tendency = 2 to 5 percent

Water Table Depth:
0 to 15 cm; median = 0 cm
(0 to 6 inches; median = 0 inches)

Flooding:
Frequency: none to occasional
Duration: none to brief

Ponding:
Frequency: frequent
Duration: long

Aspect: NA

Table 2. Representative physiographic features

Landforms	(1) Mountains > Valley (2) Mountains > Valley floor
Flooding duration	Not specified
Flooding frequency	Not specified
Ponding duration	Not specified
Ponding frequency	Not specified
Elevation	1,195 – 1,289 m
Slope	2 – 5%
Water table depth	0 cm
Aspect	Aspect is not a significant factor

Table 3. Representative physiographic features (actual ranges)

Flooding duration	Brief (2 to 7 days)
Flooding frequency	None to frequent
Ponding duration	Long (7 to 30 days)
Ponding frequency	Frequent
Elevation	1,157 – 1,355 m
Slope	0 – 10%
Water table depth	0 – 15 cm

Climatic features

Climatic Features

During the spring and summer, a circulation of air around a high-pressure center brings a prevailing westerly and northwesterly flow of comparatively dry, cool and stable air into the region. As the air moves inland, it becomes warmer and drier which results in a dry season beginning in the late spring and reaching a peak in mid-summer. In the fall and winter, a circulation of air around two pressure centers over the ocean brings a prevailing southwesterly and westerly flow of air into the Pacific Northwest. This air from over the ocean is moist and near the temperature of the water. Condensation occurs as the air moves inland over the cooler land and rises along the windward slopes of the mountains or highlands. This results in a wet season beginning in October, reaching a peak in winter, then gradually decreasing in the spring.

The elevation within the LRU varies from approximately 1,000 feet in the lower river valleys to about 4,900 feet on low mountains and foothills. The annual precipitation increases from 9 inches in the valleys to over 38 inches in the higher terrain. Winter season snowfall averages about 43 inches. Both rainfall and snowfall increase with elevation. Snow can be expected after the first of November and to remain on the ground from the first of December until March or April.

In January, the average maximum temperature is near 29° F and the minimum temperature is 14° F. Minimum temperatures from -5° to -20°F are recorded almost every winter and temperatures ranging to -25° F have been recorded. In July, the average maximum temperature is 81° and the minimum temperature 47° F. Maximum temperatures reach 100° F on a few afternoons each summer and temperatures as high as 108° F have been recorded. The average date of the last freezing temperatures can be expected by early-June and after early-September in the warmer areas.
(Compiled from WRCC: Climate of Washington and available station data)

Frost-free period (days):
Total range = 95 to 110 days
Central tendency = 95 to 100 days

Mean annual precipitation (cm):
Total range = 605 to 625 mm
(24 to 25 inches)
Central tendency = 605 to 620 mm
(24 inches)

MAAT (C)
Total range = 3.4 to 5.8
(38 to 42 F)
Central tendency = 4.7 to 5.8
(41 to 42 F)

Climate stations: none

Soil features

Representative Soil Features
This ecological site is associated with Cryohemists, and Histic Cryaquepts components. These soils have developed in organic materials over mixed alluvium or till. Sites have a surface that has developed in moderately to highly decomposed organic material.

Parent Materials:
Kind: organic
Origin:
Kind: alluvium, till
Origin: mixed

Surface Texture: (<2mm fraction)
(1) Mucky-Peat

Surface Fragments

Table 4. Representative soil features

Parent material	(1) Organic material (2) Alluvium (3) Till
Surface texture	(1) Mucky peat
Drainage class	Poorly drained to very poorly drained
Permeability class	Not specified
Depth to restrictive layer	0 cm
Surface fragment cover <=3"	0%
Surface fragment cover >3"	0%
Available water capacity (0-101.6cm)	21.84 cm
Calcium carbonate equivalent (0-152.4cm)	0%
Electrical conductivity (0-152.4cm)	0 mmhos/cm
Sodium adsorption ratio (0-152.4cm)	0
Soil reaction (1:1 water) (0-152.4cm)	6.7

Table 5. Representative soil features (actual values)

Drainage class	Somewhat poorly drained to very poorly drained
Permeability class	Moderate
Depth to restrictive layer	0 cm
Surface fragment cover <=3"	0%
Surface fragment cover >3"	0%
Available water capacity (0-101.6cm)	17.02 – 26.42 cm
Calcium carbonate equivalent (0-152.4cm)	0%
Electrical conductivity (0-152.4cm)	0 mmhos/cm
Sodium adsorption ratio (0-152.4cm)	0
Soil reaction (1:1 water) (0-152.4cm)	6.1 – 7.3

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	11/23/2024
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 R043AY515ID

Cryic Aquic Organic Flood Plains (SAFA)

Last updated: 10/23/2020 Accessed: 11/23/2024