Natural Resources
Conservation Service
Ecological site R239XY055AK
Forb Tundra (Coastal)
Accessed: 11/21/2024
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.
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
Not specified |
| Herbaceous |
Not specified |
Physiographic features
This site occurs on nearly level beach terraces and on toe-slopes of rocky uplands adjacent to the coast.
Table 2. Representative physiographic features
| Landforms |
(1)
Coastal plain
|
|---|---|
| Elevation | 5 – 80 ft |
| Slope | 3% |
Climatic features
Table 3. Representative climatic features
| Frost-free period (average) | 120 days |
|---|---|
| Freeze-free period (average) | 100 days |
| Precipitation total (average) | 24 in |
Figure 1. Monthly precipitation range
Figure 2. Monthly average minimum and maximum temperature
Influencing water features
Soil features
Soils are shallow to deep and well drained. Textures are coarse and soil pH is strongly acid to slightly acid. Runoff is very low to low, and permeability is moderately rapid to rapid.
Table 4. Representative soil features
| Surface texture |
(1) Peaty sand |
|---|---|
| Family particle size |
(1) Sandy |
| Drainage class | Well drained |
| Permeability class | Moderately rapid to rapid |
| Soil depth | 10 – 60 in |
| Surface fragment cover <=3" | Not specified |
| Surface fragment cover >3" | Not specified |
| Available water capacity (0-40in) |
2.9 – 3.1 in |
| Calcium carbonate equivalent (0-40in) |
Not specified |
| Electrical conductivity (0-40in) |
Not specified |
| Sodium adsorption ratio (0-40in) |
Not specified |
| Soil reaction (1:1 water) (0-40in) |
5.1 – 6.5 |
| Subsurface fragment volume <=3" (Depth not specified) |
Not specified |
| Subsurface fragment volume >3" (Depth not specified) |
Not specified |
Ecological dynamics
State and transition model
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Ecosystem states
State 1 submodel, plant communities
State 1
Elymus mollis/ Lupinus nootkatensis
Community 1.1
Elymus mollis/ Lupinus nootkatensis
Grasses make up 45% and forbs 55% of the composition. Total annual vascular herbage production is 3300 pounds/acre.
Figure 3. Annual production by plant type (representative values) or group (midpoint values)
Additional community tables
Table 5. Community 1.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | 1300–1400 | |||||
| American dunegrass | LEMOM2 | Leymus mollis ssp. mollis | 960–970 | – | ||
| wideleaf polargrass | ARLA2 | Arctagrostis latifolia | 330–340 | – | ||
| bluegrass | POA | Poa | 40–45 | – | ||
| alpine timothy | PHAL2 | Phleum alpinum | 20–25 | – | ||
|
Forb
|
||||||
| 1 | 1730–1750 | |||||
| seacoast angelica | ANLU | Angelica lucida | 530–550 | – | ||
| Pacific hemlockparsley | COGM | Conioselinum gmelinii | 295–305 | – | ||
| Tilesius' wormwood | ARTI | Artemisia tilesii | 240–260 | – | ||
| boreal yarrow | ACMIB | Achillea millefolium var. borealis | 230–240 | – | ||
| Nootka lupine | LUNO | Lupinus nootkatensis | 180–190 | – | ||
| tall Jacob's-ladder | POAC | Polemonium acutiflorum | 85–90 | – | ||
| field horsetail | EQAR | Equisetum arvense | 25–35 | – | ||
| monkshood | ACONI | Aconitum | 30–35 | – | ||
| Aleutian violet | VILA6 | Viola langsdorffii | 15–25 | – | ||
| whorled lousewort | PEVE | Pedicularis verticillata | 15–20 | – | ||
| arctic starflower | TREU | Trientalis europaea | 5–15 | – | ||
| captiate valerian | VACA3 | Valeriana capitata | 0–5 | – | ||
Interpretations
Animal community
Grasses such as wide leaf polargrass, alpine timothy and bluegrass provide high value reindeer forage spring to fall. These same grasses decline in forage value during the winter at which time their forage value is moderate. Lyme grass is seldom selected by reindeer during spring and summer and is of no value during wimter. The large variety of forbs provides excellent spring and summer forage.
Supporting information
Contributors
Swanson
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 | |
| Approved by | |
| 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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