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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.
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Figure 1. Mapped extent
Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated.
MLRA notes
Major Land Resource Area (MLRA): 002X–Willamette and Puget Sound Valleys
Major Land Resource Area-[MLRA][LRU]: 002X N Willamette and Puget Sound Valleys, North Puget. The Land Resource Unit (LRU) is described in detail in the reference Washington NRCS Pasture TN-101 Forage Zones available on the eFOTG. For more information on MLRA’s, refer to the following web site: http://www.essc.psu.edu/soil_info/soil_lrr/. Additional information on Common Resource Areas is available on the eFOTG for NRCS Washington: http://efotg.nrcs.usda.gov/efotg_locator.aspx?map=WA and the following website: http://soils.usda.gov/survey/geography/cra.html. This ecological site occurs in the following Common Resource Areas: 2.10 - Fraser Lowland; 2.11 - Eastern Puget Riverine Lowlands; 2.11 - Eastern Puget Mountain River Valleys; 2.12 - San Juan Islands; 2.13 - Olympic Rainshadow; 2.5 - Eastern Puget Uplands; and 2.6 - Central Puget Lowland
Table 1. Dominant plant species
Tree Not specified
Shrub Not specified
Herbaceous Not specified
Physiographic features
Occurs on gentle slopes or flats, part of rolling or planar glacial landforms.
Table 2. Representative physiographic features
Landforms (1) Hill
(2) Till plain
(3) Beach terrace
Flooding frequency None Ponding frequency None Elevation 0 – 220 ft Slope 0 – 20 % Aspect SE, S, SW Climatic features
The average annual precipitation ranges from 18 to 60 inches, although most areas range from 30 to 50 inches. Annual precipitation less than 30 inches occurs in the rainshadow of the Olympic Mountains along the western border of this area and in the San Juan Islands. Higher average annual precipitation, 50 to 60 inches, occurs next to the foothills of the surrounding mountains. Most of the precipitation occurs as low intensity, Pacific frontal storms. The distribution is 75% in the fall and winter, 15% in the spring and 10% in the summer. Rain turns to snow at the higher elevations, although accumulations are usually small and of short duration. The number of days with snow on the ground varies from 0 to 9, with an averge of 3 days. Summers are cool and dry. Recorded temperature extremes range from -1 degrees to 107 degrees fahrenheit. See the climate tables in this document for information on temperatures and frost-free periods.
Table 3 Representative climatic features
Frost-free period (average) 200 days Freeze-free period (average) 260 days Precipitation total (average) 40 in BarLineFigure 2. Monthly precipitation range
BarLineFigure 3. Monthly average minimum and maximum temperature
Figure 4. Annual precipitation pattern
Figure 5 Annual average temperature pattern
">Influencing water features
Soil features
Landscape Position: The soils that support this native plant community typically occur on outwash plains. The soils are generally deep, coarse textured soils with good internal drainage with very dark A horizons in the soil profile. They often contain significant amounts of sand. Soils may be deep sandy loam outwash or somewhat shallow gravelly loam glacial till.
Table 4. Representative soil features
Surface texture (1) Sandy loam
(2) Gravelly loam
(3) Coarse sandy loam
Family particle size (1) Sandy
Drainage class Somewhat excessively drained to moderately well drained Permeability class Moderate to moderately rapid Soil depth 20 – 40 in Surface fragment cover <=3" 0 – 10 % Surface fragment cover >3" Not specified Available water capacity
(0-40in)1.6 – 3.4 in Soil reaction (1:1 water)
(0-40in)5.5 – 6.5 Subsurface fragment volume <=3"
(Depth not specified)0 – 46 % Subsurface fragment volume >3"
(Depth not specified)0 – 2 % Ecological dynamics
Native prairies and introduced grassland communities are maintained by both biotic and abiotic pressures. Fire, both human and lightning caused, was an influence on development of all the prairie soils, regardless of location. Human caused fires were periodic, used to stimulate the growth of carbohydrate-rich forbs which were harvested by Native American tribes in the area. Wild game would also be attracted into the area by the nutritious regrowth of grasses and forbs. Fire also controlled invasion of woody plants which can outcompete and replace grasses and forbs as the dominant species on a site. Human influence continues to be a major factor affecting these grassland communities, as farming, livestock grazing, conversion to woodland, reduction of fire occurrence, removal of active management, and development of home sites all have significant effects on both native and introduced grassland communities.
Typical native plant species found on the site include Roemer’s fescue (Festuca idahoensis v. roemeri), camas (Camassia quamash), Blue Wildrye (Elymus glaucus), Slender Wheatgrass (Elymus trachycaulus), common wooley sunflower(Eriophyllum lanatum), field chickweed (Cerastium arvense ssp strictum) and Oregon White Oak (Quercus garryana).
Some disturbance is natural in these plant communities, including: fire, both natural and human caused; soil perturbation resulting from causes such as small mammals, earthworms, root activity; freeze-thaw cycles; and harvest of bulbs and rhizomes; and wildlife grazing. Disturbances can be reduced or eliminated through actions such as fire control, or cessation of activities such as mowing, soil disturbance, livestock grazing or vehicle access. If no disturbance occurs, this plant community will be invaded by shrub and tree species. Typical shrub and tree species include snowberry, rose, Douglas fir and lodgepole pine. Disturbance will affect the different plant classes in varying ways. Timing of disturbance will also affect shifts in plant communities. The Disturbance Effects Table (below)summarizes some of these effects.
If nonnative species are present in the area, these will invade the site whether or not disturbance is maintained, increased, or eliminated. Their dominance in the community will be affected by the type and intensity of disturbance, as will the dominance of the different plant classes. If disturbance such as tillage, herbicide use, or intensive vehicle traffic eliminates the plant community, then a nonnative plant community will be established, either through planting, or invasion of introduced seral species.
Restoration – It’s possible to reestablish plant communities on suitable soils. Native species can be replanted and the site managed to maintain or increase the percentage cover of these species. The Disturbance Effects table lists appropriate types of disturbance to help establish the desired plant community. If nonnatives are present on the site, there will always be a presence in the community as these species are adapted to a wide range of soils, climates and disturbance regimes. However, the management of disturbance types can affect the balance of species on a site.State and transition model
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More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 3 submodel, plant communities
State 1
ReferenceCommunity 1.1
Herbaceous Prairie
Figure 6. Roemers fescue Community
Figure 7. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
Plant type Low
(lb/acre)Representative value
(lb/acre)High
(lb/acre)Grass/Grasslike 660 825 990 Forb 480 600 720 Shrub/Vine 48 60 72 Tree 12 15 18 Total 1200 1500 1800 Figure 8. Plant community growth curve (percent production by month). WA0222 , Droughty. Droughty or limited depth soils (available water-holding capacity generally < 4.5"/40" soil depth).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 2 8 15 23 19 17 5 1 1 5 3 1 Community 1.2
Native Shrub and Herbaceous PrairieCommunity 1.3
Oak SavannaCommunity 1.4
Oak ThicketsPathway 1.1A
Community 1.1 to 1.2No fire or other disturbance – This pathway/transition occurs when disturbances, either natural or man-made, are reduced or eliminated through actions such as fire control, or cessation of activities such as mowing, soil perturbation grazing or vehicle access
Pathway 1.2A
Community 1.2 to 1.1Fire, Brush Control or Other Disturbance – This pathway occurs when controlled disturbance is restored to the system, through methods such as prescribed fire, brush control, invasive plant control, mowing, thatching, grazing, and/or soil aeration.
Pathway 1.3B
Community 1.3 to 1.1Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 1.3A
Community 1.3 to 1.2Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 1.4B
Community 1.4 to 1.1Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 1.4A
Community 1.4 to 1.2Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
State 2
Introduced InvadedThese sites generally occur on coarse-textured soils with good internal drainage, oak occurs on aspects protected from strong marine winds and regenerates slowly. Vegetation is composed of a mixture of non-native and native plant species.
Community 2.1
Introduced and Native Herbaceous PrairieCommunity 2.2
Introduced, Native Shrub, and Herbaceous PrairieCommunity 2.3
Oak Savanna InvadedCommunity 2.4
Oak Thickets InvadedPathway 2.1A
Community 2.1 to 2.2No fire or other disturbance – This pathway/transition occurs when disturbances, either natural or man-made, are reduced or eliminated through actions such as fire control, or cessation of activities such as mowing, soil perturbation grazing or vehicle access.
Pathway 2.2A
Community 2.2 to 2.1Fire, Brush Control or Other Disturbance – This pathway occurs when controlled disturbance is restored to the system, through methods such as prescribed fire, brush control, invasive plant control, mowing, thatching, grazing, and/or soil aeration.
Pathway 2.3B
Community 2.3 to 2.1Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 2.3A
Community 2.3 to 2.2Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 2.4B
Community 2.4 to 2.1Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Pathway 2.4A
Community 2.4 to 2.2Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
State 3
Conifer InvadedCommunity 3.1
F002XN901WATransition T1A
State 1 to 2This transition occurs when uncontrolled disturbance is persistent in the system, such as: overgrazing; mowing in the wrong season, wrong height, or at the wrong frequency; vehicle use which causes vegetation damage; or too-frequent fire. In addition, non-native plant seeds or propagules or present on or near the site.
Transition T1B
State 1 to 3No fire or other disturbance – This pathway/transition occurs when disturbances, either natural or man-made, are reduced or eliminated through actions such as fire control, or cessation of activities such as mowing, soil perturbation grazing or vehicle access.
Restoration pathway R2A
State 2 to 1Transition T2A
State 2 to 3No fire or other disturbance – This pathway/transition occurs when disturbances, either natural or man-made, are reduced or eliminated through actions such as fire control, or cessation of activities such as mowing, soil perturbation grazing or vehicle access.
Restoration pathway R3A
State 3 to 1Tree Removal and Restoration – Harvest and removal of trees from the site; or girdling of trees. Additionally, removal of non-native species grass, forb and shrub species and restoration or the original plant community through methods such as prescribed fire, brush control, invasive plant control, mowing, thatching, grazing, and/or soil aeration and reseeding.
Restoration pathway R3B
State 3 to 2Tree Removal – Harvest and removal of trees from the site; or girdling of trees.
Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 Perennial Grasses 0 Lemmon's needlegrass ACLE8 Achnatherum lemmonii 0 – California oatgrass DACA3 Danthonia californica 0 – blue wildrye ELGL Elymus glaucus 0 – slender wheatgrass ELTR7 Elymus trachycaulus 0 – Roemer's fescue FEIDR2 Festuca idahoensis ssp. roemeri 0 – red fescue FERU2 Festuca rubra 0 – prairie Junegrass KOMA Koeleria macrantha 0 – Sandberg bluegrass POSE Poa secunda 0 – 2 Perennial Grasslike 0 long-stolon sedge CAIN9 Carex inops 0 – Pacific woodrush LUCO6 Luzula comosa 0 – 3 Annual Grasses 0 Howell's bluegrass POHO6 Poa howellii 0 – Forb6 Bulbs 0 tapertip onion ALAC4 Allium acuminatum 0 – crown brodiaea BRCO3 Brodiaea coronaria 0 – large camas CALE5 Camassia leichtlinii 0 – small camas CAQU2 Camassia quamash 0 – checker lily FRAFA2 Fritillaria affinis var. affinis 0 – meadow deathcamas ZIVE Zigadenus venenosus 0 – 7 Perennial Forbs/Fibrous-rooted 0 darkthroat shootingstar DOPU Dodecatheon pulchellum 0 – hookedspur violet VIAD Viola adunca 0 – 8 biscuitroots 0 barestem biscuitroot LONU2 Lomatium nudicaule 0 – common lomatium LOUT Lomatium utriculatum 0 – 9 Balsamroot 0 deltoid balsamroot BADE2 Balsamorhiza deltoidea 0 – 10 Perennial Forbs 0 common yarrow ACMI2 Achillea millefolium 0 – field chickweed CEAR4 Cerastium arvense 0 – Menzies' larkspur DEME Delphinium menziesii 0 – common woolly sunflower ERLA6 Eriophyllum lanatum 0 – Virginia strawberry FRVI Fragaria virginiana 0 – western buttercup RAOC Ranunculus occidentalis 0 – 11 Ferns 0 western brackenfern PTAQ Pteridium aquilinum 0 – 12 Perennial Legume 0 American vetch VIAM Vicia americana 0 – 13 Annual 0 giant blue eyed Mary COGR2 Collinsia grandiflora 0 – 14 Annual Legume 0 desert deervetch LOMI Lotus micranthus 0 – smallflower lupine LUPO3 Lupinus polycarpus 0 – Shrub/Vine20 Shrubs 0 Nootka rose RONU Rosa nutkana 0 – common snowberry SYAL Symphoricarpos albus 0 – Tree25 Tree 0 Pacific madrone ARME Arbutus menziesii 0 – lodgepole pine PICO Pinus contorta 0 – Douglas-fir PSME Pseudotsuga menziesii 0 – Oregon white oak QUGA4 Quercus garryana 0 – Table 7. Community 1.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 1.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 1.4 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 10. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 11. Community 2.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 12. Community 2.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 13. Community 2.4 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 14. Community 3.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Supporting information
Contributors
Martha Chaney
Approval
Kirt Walstad, 12/09/2024
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 11/27/2024 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
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Presence of water flow patterns:
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Number and height of erosional pedestals or terracettes:
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Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
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Number of gullies and erosion associated with gullies:
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Extent of wind scoured, blowouts and/or depositional areas:
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Amount of litter movement (describe size and distance expected to travel):
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Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
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Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
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Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
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Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
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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:
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Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
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Average percent litter cover (%) and depth ( in):
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Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
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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:
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Perennial plant reproductive capability:
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