Natural Resources
Conservation Service
Ecological site R012XY047ID
Marsh TYLA-SCAC3
Last updated: 9/22/2020
Accessed: 04/18/2024
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.
MLRA notes
Major Land Resource Area (MLRA): 012X–Lost River Valleys and Mountains
Land Resource Region: B (Northwestern Wheat and Range)
MLRA: 12 (Lost River Valleys and Mountains)
EPA EcoRegion: Level III (Middle Rockies)
LRU notes
012X-Lost River Valleys and Mountains
Additional moisture site:
https://soils.usda.gov/survey/geography/mlra/index.html
Classification relationships
No data.
Ecological site concept
Site receives additional water.
Soils are:
Not saline or saline-sodic.
Deep to very deep, not skeletal within 20” of soil surface.
Season water table <40” with high amounts of organic matter
Poorly drained, standing water is common until late summer
Not strongly or violently effervescent in surface mineral 10”.
Slope is < 30%.
Clay content is = <35% in surface mineral 4”.
Site does not have an argillic horizon with > 35% clay.
Associated sites
| R012XY038ID |
Meadow DECA18/CANE2 |
|---|---|
| R012XY045ID |
Riparian Wet Meadow Salix/Carex |
| R012XY046ID |
Wet Meadow Carex-Juncus |
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
Not specified |
| Herbaceous |
(1) Typha latifolia |
Physiographic features
This site generally occurs on nearly level margins of streams, ponds, lakes, springs, reservoirs, and as stringers paralleling stream or river channels. This site can also occur as parts of old stream courses, oxbows, and potholes. Slopes are less than 2 percent. Elevations range between 3600-6800 feet (1100-2100 meters).
Table 2. Representative physiographic features
| Landforms |
(1)
Flood plain
|
|---|---|
| Flooding duration | Brief (2 to 7 days) to long (7 to 30 days) |
| Flooding frequency | Rare to frequent |
| Ponding duration | Brief (2 to 7 days) to long (7 to 30 days) |
| Ponding frequency | Rare to frequent |
| Elevation | 3,600 – 6,800 ft |
| Slope | 2% |
| Ponding depth | 2 – 12 in |
| Water table depth | 12 in |
Climatic features
MLRA 12 is dominated by dramatic changes in elevation which, in turn, influence local weather patterns. The intermontane valleys have elevations as low as 3800 feet, while the adjacent mountains may reach more than 12,600 feet. The average annual precipitation for the entire MLRA, based on 10 long term climate stations located throughout the MLRA, is approximately 9.38 inches. However, the dry valleys may have averages as low as 6 inches, while the upper peaks may have averages that exceed 46 inches per year.
Temperatures vary considerably over the year. The average annual temperature is 42.25 degrees F. The average low is 27.4 degrees while the average high temperature is 57 degrees.
In the summer the sun shines 78% of the time, but drops to 40% in the winter. The prevailing wind is location-dependent, and generally flows parallel to the orientation of the dominant valleys. In the summer localized afternoon upslope winds and evening downslope winds are common. The average windspeed is greatest in the spring and early summer.
The frost free period ranges from 102 to 107 days while the freeze free period ranges from 134 to 139 days across the MLRA.
Table 3. Representative climatic features
| Frost-free period (average) | 107 days |
|---|---|
| Freeze-free period (average) | 139 days |
| Precipitation total (average) | 11 in |
Figure 1. Monthly precipitation range
Figure 2. Monthly average minimum and maximum temperature
Influencing water features
The Marsh site is influenced by additional water from either adjacent streams through seasonal flooding, water table, seeps or springs, or from run-on from adjacent sites. The site may include the following wetlands and stream types.
Soil features
Typically these soils are erratically stratified with a surface mat of roots 4 or more inches deep over 3 to 6 inches of organic material over clays, clay loams, or silty clay loams that are over 60 inches deep. These soils are poorly drained and alluvial in origin. The soils are usually slightly acid to slightly alkaline in pH. Soils are saturated throughout the growing season and usually have standing water at or above the surface into the late summer.
Flooding can be frequent during snowmelt and just after snowmelt. Ponding is normal. The plant community is dependent on saturated soils and standing water during the growing season.
Soil Series Correlated to this Ecological Site -
None
Table 4. Representative soil features
| Surface texture |
(1) Silty clay loam (2) Clay loam |
|---|---|
| Drainage class | Poorly drained |
| Soil depth | 60 in |
Ecological dynamics
The dominant visual aspect of this site is broadleaf cattail and/or hardstem bulrush. Hardstem bulrush is more dominant where water is 6 to 8 inches deep or deeper throughout the growing season. Broadleaf cattail is often more dominant where the water is at the soil surface through most of the growing season and may dry out at the surface later in the summer. When the two species occur together, broadleaf cattail is in shallower water or typically closer to the shoreline from hardstem bulrush. This is common on margins of ponds, lakes, and reservoirs.
The site often occurs within a complex of wetland sites when adjacent to streams or rivers. In these situations, the soil surface of the area where the site is found is typically slightly undulating causing small depressions and high spots with variable soil moisture regimes. The plant communities found on these areas are sites within the complex. Characteristics of these sites are as follows:
1. Marsh site. Deeper depressions with the water table at or near the surface or slightly above the surface for the entire growing season. This site is dominated by broadleaf cattail, hardstem bulrush, and common threesquare.
2. Wet Meadow site. Shallow to depression areas with the water table at or near the surface for the entire growing season. This site is dominated by Carex spp. and Junus spp.
3. Meadow site. Slightly higher areas that are drier during the growing season. The water table is down to a depth of 20 to 40 inches by the end of the growing season. This site is dominated by tufted hairgrass and Nebraska sedge.
4. Dry Meadow site. Even higher areas that are even drier during the growing season and the water table is > 40 inches deep by the end of the growing season. The plant community is dominated by Nevada bluegrass and alpine timothy.
Either hardstem bulrush or broadleaf cattail can form impenetrable monotypic stands. Composition by weight is 95 percent grass or grass-like and 5 percent forbs.
During the last few thousand years, this site has evolved in a semi-arid to montane climate characterized by dry summers and cold, moist or wet winters. The site has evolved on deep alluvial soils that are saturated at the soil surface or have standing water throughout most of the growing season. Herbivory has historically occurred on this site at very low levels of utilization. Herbivory by some small mammals such as muskrats does occur.
Fire has had little influence on the development of the site. Rare wildfires can occur following consecutive drought years, particularly if broadleaf cattail stands go dry late in the summer.
The conditions for the plant community of this site are variable due to differences in the duration and depth of standing water. Dominant species are mostly rhizomatous and can form monotypic stands.
An infinite number of combinations of factors that influence the ecology of potential plant communities exist. For practical purposes, four plant communities where the depth to the water table drives the vegetative composition have been described. They are:
• Dry meadow Water table at >40” at end of growing season
• Meadow Water table at 20-40” at end of growing season
• Wet meadow Water table at 10-20” at end of growing season
• Marsh Water at surface to <10” at end of growing season
Most wetland species have a wide range of tolerance for variations in soil moisture. Most species occur in more than one site, although most are dominant on just one site.
The following table shows the amplitude of wetland species that occur on the four sites.
• Ecological Amplitude of Meadow/Marsh Plants
Grass and Grass-like Species
Scientific name Dry Meadow Meadow Wet Meadow Marsh
Leymus cinereus
Danthonia califormica
Carex filifolia
Pascopyron smithii
Poa nevadensis
Juncus dudleyi
Scientific name Dry Meadow Meadow Wet Meadow Marsh
Muhlenbergia richardsonis
Hordeum brachyantherum
Phleum alpinum
Juncus balticus
Juncus torreyi
Alopecurus aequalis
Carex athrostachya
Calamagrostis canadensis
Deschampsia caespitosa
Carex nebrascensis
Glyceria striata
Carex lasiocarpa
Carex utriculata
Carex aquatilis
Eleocharis palustris
Carex rostrata
Carex hoodii
Carex exsiccata
Scirpus microcarpus
Juncus effusus
Beckmannia syzigachne
Typha latifolia
Schoenoplectus acutus
Schoenoplectus pungens
Sparganium erectum
Schoenoplectus tabernaemontani
Forb Species
Scientific name Dry Meadow Meadow Wet Meadow Marsh
Arnica fulgens
Pyrrocoma lanceolata
Arenaria congesta
Artemisia ludoviciana
Achillea millefolium
Wyethia amplexicaulis
Pyrrocoma uniflora
Ranunculus spp.
Trifolium spp.
Potentilla gracilis
Senecio integerrimus
Aster spp.
Cirsium scariosum
Symphyotrichum ascendens
Iris missouriensis
Senecio serra
Helianthus nuttallii
Camassia quamash
Epilobium ciliatum
Montia chamissoi
Plantago major
Scientific name Dry Meadow Meadow Wet Meadow Marsh
Alisma triviale
Cicuta douglassii
Argentina anserina
Veronica anagallis-aquatica
Symphyotrichum frondosum
Polygonum bistortoides
Triglochin maritimum
Polygonum amphibium
Symphyotrichum foliaceum
Potamogeton natans
Lemna minor
The Historic Climax Plant Community (HCPC), the Reference State (State 1), moves through many phases depending on the natural and man-made forces that impact the community over time. State 1, described later, indicates some of these phases. The Reference Plant Community Phase is Phase A. This plant community is dominated by broadleaf cattail and/or hardstem bulrush. There are a few forbs that may occur in minor amounts including water knotweed, leafybract aster, floating pondweed, and common duckweed. There also may be other grass-like species occurring in minor amounts. The plant species composition of Phase A is listed later under “Reference Plant Community Phase Plant Species Composition”. The Reference Plant Community is intentionally written broadly, but these species should occur in the plant community in variable amounts.
The total annual production is 4500 pounds per acre (5040 kilograms per hectare) in a normal year. Production in a favorable year is 5500 pounds per acre (6160 kilograms per hectare). Production in an unfavorable year is 3500 pounds per acre (3920 kilograms per hectare). Most of this variation occurs from temperature differences, not moisture. Structurally, rhizomatous grass and grass-like species are very dominant, followed by perennial forbs.
FUNCTION:
This site is suitable for waterfowl, some shore birds, and small mammals. Moose graze the site occasionally. The site is not suitable for livestock grazing or big game, although some deer may use the edges for cover. Standing water limits grazing opportunities. In some drought years, some grazing can occur with livestock although wet soils should be avoided.
This site can be used for waterfowl hunting and may be adjacent to open water that offer fishing opportunities.
The site is very resistant to degradation due to standing water, low value forage, and limited grazing opportunities. Site degradation is usually the result of permanently lowering of standing water. This can occur with down cutting of adjacent stream channels. This can result from off-site conditions adjacent to the site or in the upper watershed. Once adjacent streams down-cut, concentrated flows can lower the water table and standing water.
Impacts on the Plant Community:
Influence of fire:
This site usually does not burn from wildfire. A rare fire may occur following prolonged drought. If a fire does occur, it usually does not adversely affect the plant community due to the rhizomatous species present. Most plants sprout back.
Influence of improper grazing management:
Due to standing water and low value forage, grazing during the growing season is rare. Grazing may occur during the dormant period. If dry soil conditions occur into the spring and livestock remove the tops of either broadleaf cattail or hardstem bulrush, the plants can die if water then covers them. Care must be exercised in grazing adjacent sites to avoid downcutting of stream channels that can influence standing water in this site. The potential of the site can be lost.
Weather influences:
Annual precipitation has little direct influence on this site. Prolonged drought can affect amounts and duration of standing water and can change the composition of this site. Carex and Juncus species can increase and broadleaf cattails and hardstem bulrush can decrease. Lower production can occur with below normal spring temperatures that affect both air and water. An early, hard freeze can occasionally kill some plants.
Influence of Insects and disease:
Periodic disease and insect outbreaks can affect vegetation health. An outbreak of a particular insect is usually influenced by weather but no specific data for this site is available.
Influence of noxious and invasive plants:
Purple loosestrife can become invasive, but most plants on this site are very competitive against most potential invasive species due to the monotypic stands of plants with strong rhizomes.
Influence of wildlife:
This site is important for many species of waterfowl. Some small mammals and shore birds also use the site. Moose graze the site periodically and other big game species use the edges for cover. Total numbers are seldom high enough to adversely affect the plant community.
Watershed:
The largest threat to degradation of this site is the lowering of permanent standing water during the growing season. Off-site conditions can affect the gradient of adjacent stream channels and if this occurs it can impact the water table. If down-cutting of adjacent stream occurs, this can reduce the depth and duration of the standing water. High run-off events from the adjacent uplands can severely damage or change the normal stream channel on the site. As the standing water is permanently reduced, either in depth or duration, productive potential is lost. Eventually the standing water is no longer the driving factor for the plant community. The site may regress to a meadow or even a low seral upland site.
Plant Community and Sequence:
Transition pathways between common vegetation states and phases:
State 1 to State 2. Develops through permanently reducing the standing water during the growing season to the point that dry soil is at the surface during the growing season. This can occur with down-cutting of adjacent stream channel. This site has crossed the threshold. This state cannot be returned to state 1 without returning the standing water regime.
Practice Limitations:
There are severe limitations for facilitating or accelerated practices due to standing water.
State and transition model
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Ecosystem states
State 1 submodel, plant communities
State 2 submodel, plant communities
State 1
State 1 Phase A
Community 1.1
State 1 Phase A
State 1, Phase A. Reference Plant Community Phase. This plant community is dominated by broadleaf cattail and/or hardstem bulrush. There are a few forbs that may occur in minor amounts including water knotweed, leafybract aster, floating pondweed, and common duckweed. There may also be other grass-like species occurring in minor amounts.
Figure 3. Plant community growth curve (percent production by month). ID0315, DRY MEADOW. State 1.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 0 | 10 | 20 | 25 | 25 | 10 | 10 | 0 | 0 | 0 |
State 2
State 2
Community 2.1
State 2
State 2. This plant community may be similar to Wet Meadow, Meadow, Dry Meadow, or upland sites in low to mid-seral status. Initially, Carex and Juncus species may increase or become dominant. These species can be lost as degradation continues. Forbs may increase as degradation becomes severe. This state developed due to permanent reduction of standing water. The site has crossed the threshold. This state cannot be returned to State 1 without returning the standing water regime.
Additional community tables
Interpretations
Animal community
Wildlife Interpretations.
Animal Community – Wildlife Interpretations
This ecological site provides habitat for unique wetland wildlife species. The duration of hydrology results in abundant herbaceous cover and invertebrate production, this provides food and cover for waterfowl. Wetland dependant species utilizing the site include marsh wren, great blue heron, Ibis, teal, mallard, yellow-head blackbird, red-winged blackbird, northern leopard frog, western toad, muskrat, and beaver. Large herbivores infrequently use the site due to the extreme hydrologic conditions and low nutritional value of the forage. Loss of site hydrology significantly reduces the habitat value of the adjacent ecological sites. Open water is seasonal being provided by seasonal runoff, ponding, flooding, seasonal high water table, and natural springs.
State 1 Phase 1.1 – Broadleaf Cattail/ Hardstem Bulrush Reference Plant Community (RPC): The RPC and associated hydrology exhibits deep ponded water, providing a diverse population of invertebrates (benthic and terrestrial) unique to wetlands and beneficial to water loving birds. Arthropods such as dragonflies, damselflies, midges, backswimmers, scuds, and waterfleas make up a large portion of potential invertebrates in these wetlands. They are a basic food source for many higher trophic level organisms. The reptile and amphibian community is represented by western skink, rubber boa, western rattlesnake, western toad, boreal chorus frog, long-toed salamander, and northern leopard frog. A diverse amphibian population is a key indicator of good ecological health on this site. Loss of hydrology will limit or exclude amphibians from this ecological site. The RPC provides nesting, rearing, roosting, and forage habitat for bird species such as Canada goose, American wigeon, mallard, pied billed grebe, great blue heron, sora, whimbrel, Wilson’s snipe, marsh wren, and long-billed curlew. Small mammal population is extremely limited due to hydrologic conditions. Deer mouse, montane vole, and western jumping mouse would utilize the site for water throughout the year or during the winter when the water is frozen.
State 2 Carex sp./ Juncus Sp./ Forbs/ Grasses Plant Community: The animal community may be similar to Wet Meadow, Meadow, Dry Meadow, or upland sites in low to mid-seral status depending on the severity of the hydrology manipulation of State 1 Phase 1.1. The management of the resulting plant communities will be a major factor in determining the diversity and populations of the animal community. Refer to the above mentioned ecological sites for MLRA 12 for descriptions of the potential wildlife community.
Grazing Interpretations.
Due to standing water and low value forage, grazing during the growing season is rare. Grazing may occur during the dormant period. If dry soil conditions occur into the spring and livestock remove the tops of either broadleaf cattail or hardstem bulrush, the plants can die if water then covers them. Care must be exercised in grazing adjacent sites to avoid downcutting of stream channels that can influence standing water in this site. The potential of the site can be lost.
Estimated initial stocking rate will be determined with the landowner or decision-maker. They will be based on the inventory, past use history and type, condition of vegetation, production, season of use, and seasonal preference. Calculations used to determine estimated initial stocking rate will be based on forage preference ratings.
Hydrological functions
No data.
Recreational uses
This site presents an aesthetically pleasing view of lush vegetation consisting primarily of grass-like plants and standing water. Hikers and fisherman often traverse the edges of this site. Fishing opportunities often exist on open water adjacent to this site. Waterfowl hunting can occur on or adjacent to the site.
Wood products
None.
Other products
None.
Other information
Field Offices
Arco, ID
Rexburg, ID
Salmon, ID
Challis, ID
Rigby, ID
Supporting information
Inventory data references
Information presented here has been derived from NRCS clipping and other inventory data. Also, field knowledge of range-trained personnel was used. Those involved in developing this site description include:
Dave Franzen, co-owner, Intermountain Rangeland Consultants, LLC
Jacy Gibbs, co-owner, Intermountain Rangeland Consultants, LLC
Brendan Brazee, State Rangeland Management Specialist, NRCS, Idaho
Dan Ogle, Plant Materials Specialist, NRCS, Idaho
Chris Hoag, Wetland Plant Ecologist, NRCS, Idaho
Jim Cornwell, Range Management Specialist, IASCD
Lee Brooks, Range Management Specialist, IASCD
Kristen May, Resource Soil Scientist, NRCS, Idaho
Other references
USDA, NRCS.2001. The PLANTS Database, Version 3.1 (http://plants.usda.gov.) National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
USDA NRCS. 1992. Major Land Resource Area, Owyhee High Plateau, Range Site Descriptions. Reno, Nevada.
USDA NRCS. Major Land Resource Area, Owyhee High Plateau, Range Site Descriptions. Portland, Oregon.
USDA, Forest Service. 2004. (www.fs.fed.us/database/feis/plants.).
USDI, BLM and Idaho Conservation Data Center. 2001. Riparian and Wetland Plant Associations of Southwestern Idaho.
USDI Bureau of Land Management, US Geological Survey; USDA Natural Resources Conservation Service, Agricultural Research Service; Interpreting Indicators of Rangeland Health. Technical Reference 1734-6; Version 4-2005.
Contributors
DF
Approval
Kendra Moseley, 9/22/2020
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) |
Dave Franzen and Jacy Gibbs Intermountain Range Consultants 17700 Fargo Rd. Wilder, ID 83676 |
|---|---|
| Contact for lead author | Brendan Brazee, State Rangeland Management Specialist USDA-NRCS 9173 W. Barnes Drive, Suite C, Boise, ID 83709 |
| Date | 04/21/2009 |
| Approved by | Kendra Moseley |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
rills do not occur on this site. -
Presence of water flow patterns:
water flow patterns do not occur on this site. The site is covered with water. -
Number and height of erosional pedestals or terracettes:
neither occurs on this site. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
none. -
Number of gullies and erosion associated with gullies:
none. -
Extent of wind scoured, blowouts and/or depositional areas:
blowouts and depositional areas do not occur. -
Amount of litter movement (describe size and distance expected to travel):
litter may move in the standing water. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
values should range from 4 to 6 but needs to be tested. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
structure ranges __________. Soil organic matter (SOM) needs to be determined. The A or A1 horizon is typically ________inches thick. NO DATA -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
site has standing water. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
a compaction layer is not present. -
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:
rhizomatous speciesSub-dominant:
perennial forbsOther:
Additional:
-
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Little mortality occurs on the site. -
Average percent litter cover (%) and depth ( in):
not applicable. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
is 4500 pounds per acre (5040 Kg/ha) in a year with normal amounts of standing water and temperatures. Rhizomatous species produce 90-95 percent of the total production and forbs less than 10 percent. -
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:
includes purple loosestrife and common reed. -
Perennial plant reproductive capability:
all functional groups have the potential to reproduce in most years. Most of the plants can reproduce vegetatively.
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