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Salix amygdaloides / Salix exigua Riparian Woodland
Translated Name: Peachleaf Willow / Narrowleaf Willow Riparian Woodland
Unique Identifier: CEGL000948
Classification Approach: International Vegetation Classification (IVC)
Summary: This association occurs in riparian habitats on the Columbia Plateau in the interior northwest, in the Uinta Basin in northeastern Utah, and within Bandelier National Monument in north-central New Mexico. Elevation ranges from 100-1600 m. Stands are located in overflow channels of large rivers, and on narrow floodplains of small creeks. Substrates include a wide range of soil textures with the exception of clay. Soils are classified predominantly as Entisols (Fluvents) or Mollisols (Borolls). The water table is within 1 m of the soil surface during the growing season, and the vegetation is tolerant of prolonged flooding. The ground surface is characterized by shrubs rooted in exposed gravels and sands. This riparian woodland has a moderately open overstory canopy dominated by the small tree Salix amygdaloides with Salix exigua dominating the tall-shrub layer near the shore. Other tree species may include scattered Populus fremontii, Acer negundo, Populus angustifolia, Populus deltoides, and the introduced Elaeagnus angustifolia. Associated shrubs in the moderately dense short-shrub layer include Rhus trilobata and Apocynum cannabinum. The invasive exotic Tamarix ramosissima may present in the tall-shrub layer in disturbed stands. The herbaceous layer is often dominated by graminoids such as Hordeum jubatum, Phalaris arundinacea, Pascopyrum smithii, Eleocharis palustris, and Distichlis spicata, along with forbs such as Maianthemum stellatum, Ambrosia tomentosa, and Iva axillaris. Introduced herbaceous species are present to dominant in many stands and may include Bromus inermis, Cirsium arvense, Lepidium latifolium, Melilotus officinalis, and Poa pratensis.



Classification

Classification Confidence: Low
Classification Comments: Stands from the Green River in Utah may be different from the stands described from small creeks on the Hanford Site along the Columbia River in Washington.

Vegetation Hierarchy
Class 1 - Forest & Woodland
Subclass 1.B - Temperate & Boreal Forest & Woodland
Formation 1.B.3 - Temperate Flooded & Swamp Forest
Division 1.B.3.Nd - Western North American Interior Flooded Forest
Macrogroup Interior Warm & Cool Desert Riparian Forest
Group Western Interior Riparian Forest & Woodland
Alliance Rio Grande Cottonwood - Plains Cottonwood - Peachleaf Willow Riparian Woodland

This is the revised vegetation hierarchy. For more information see Classification Sources and usnvc.org.



Related Concepts from Other Classifications

Related Subnational Community Units
These data are subject to substantial ongoing revision and may be out of date for some states.
In the U.S., contact the state Heritage Program for the most complete and up-to-date information at: http://www.natureserve.org/natureserve-network.
Information from programs in other jurisdictions will be posted when they are made available.
Subnation Concept Name Relationship to Standard Confidence Reference
Idaho Salix amygdaloides / Salix exigua Woodland Equivalent Certain IDCDC 2005
Oregon Salix amygdaloides - Salix exigua Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Salix amygdaloides / Salix exigua Woodland
Relationship: = - Equivalent
Reference: Von Loh, J. 2000. Draft local descriptions of the vegetation associations of Ouray National Wildlife Refuge. USGS Bureau of Reclamation, Remote Sensing and GIS Group, Denver Federal Center, Denver.
Related Concept Name: Salix amygdaloides
Relationship: = - Equivalent
Reference: Evans, S. 1989a. Riparian survey of Washington's Columbia Basin. Unpublished report prepared for The Nature Conservancy Washington Natural Heritage Program, Olympia, Washington.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES304.768 Columbia Basin Foothill Riparian Woodland and Shrubland


NatureServe Conservation Status
Global Status: G1Q (01Feb1996)
Rounded Global Status: G1 - Critically Imperiled

Distribution
Color legend for Distribution Map
United States Distribution: IDpotentially occurs, NM, OR, UT, WA
Global Distribution: United States
Global Range: This association occurs in riparian habitats on the Columbia Plateau in the interior northwest, in the Uinta Basin in northeastern Utah, and within Bandelier National Monument in north-central New Mexico.

U.S. Forest Service Ecoregions
Domain Name: Dry Domain
Division Name: Temperate Desert Division
Province Name: Intermountain Semi-Desert and Desert Province
Province Code: 341 Occurrence Status: Confident or certain
Section Name: Uinta Basin Section
Section Code: 341C Occurrence Status: Confident or certain
Province Name: Intermountain Semi-Desert Province
Province Code: 342 Occurrence Status: Confident or certain
Section Name: Owyhee Uplands Section
Section Code: 342C Occurrence Status: Confident or certain
Section Name: Columbia Basin Section
Section Code: 342I Occurrence Status: Possible
Division Name: Temperate Steppe Regime Mountains
Province Name: Southern Rocky Mountain Steppe - Open Woodland - Coniferous Forest - Alpine Meadow Province
Province Code: M331 Occurrence Status: Confident or certain
Section Name: South-Central Highlands Section
Section Code: M331G Occurrence Status: Confident or certain
Province Name: Middle Rocky Mountain Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M332 Occurrence Status: Confident or certain
Section Name: Idaho Batholith Section
Section Code: M332A Occurrence Status: Confident or certain
Section Name: Beaverhead Mountains Section
Section Code: M332E Occurrence Status: Confident or certain
Section Name: Challis Volcanics Section
Section Code: M332F Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: This riparian woodland has a moderately open overstory canopy dominated by the small tree Salix amygdaloides with Salix exigua dominating the tall-shrub layer near the shore. Other tree species may include scattered Populus fremontii, Acer negundo, Populus angustifolia, Populus deltoides, and the introduced Elaeagnus angustifolia. Associated shrubs in the moderately dense short-shrub layer may include Apocynum cannabinum and Rhus trilobata. The invasive exotic Tamarix ramosissima may be present in the tall-shrub layer in disturbed stands. The herbaceous layer is often dominated by graminoids such as Distichlis spicata, Eleocharis palustris, Hordeum jubatum, Phalaris arundinacea, and Pascopyrum smithii, along with forbs such as Ambrosia tomentosa, Iva axillaris, and Maianthemum stellatum. Introduced herbaceous species are present to dominant in many stands and may include Bromus inermis, Cirsium arvense, Lepidium latifolium, Melilotus officinalis (= Melilotus albus), and Poa pratensis.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Salix amygdaloides G1 Broad-leaved deciduous tree Tree canopy  
 
 
Tamarix ramosissima G1 Broad-leaved deciduous tree Tree canopy      
 
 
Salix exigua G1 Broad-leaved deciduous tree Tall shrub/sapling  
 
 
Cirsium arvense G1 Flowering forb Herb (field)      
 
 
Lepidium latifolium G1 Flowering forb Herb (field)      
 
 
Melilotus officinalis G1 Flowering forb Herb (field)      
 
 
Bromus inermis G1 Graminoid Herb (field)      
 
 
Poa pratensis G1 Graminoid Herb (field)      
 
 

Vegetation Structure Summary: Tree canopy 5-15 m tall and short shrub 0.5-2 m.

Vegetation Structure
Stratum Growth Form
Height of Stratum (m)
Cover
Class
%
Min
Cover %
Max
Cover %
Tree canopy Other/unknown
10 - 15 m
 
25
60
Tall shrub/sapling Shrub
2 - 5 m
 
10
60
Short shrub/sapling Shrub
1 - 2 m
 
10
25
Herb (field) Flowering forb
<0.5 m
 
0
25
Herb (field) Graminoid
<0.5 m
 
0
25


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This association occurs in riparian habitats on the Columbia Plateau in the interior northwest and in the Uinta Basin in northeastern Utah. Elevation ranges from 100-1600 m. It is also known to occur at 1640 m (5370 feet) in elevation along a canyon bottom with low solar exposure within Bandelier National Monument in north-central New Mexico. Stands are located in overflow channels of large rivers, and on narrow floodplains of small creeks. Substrates include a wide range of soil textures with the exception of clay. Soils are classified predominantly as Entisols (Fluvents) or Mollisols (Borolls). The water table is within 1 m of the soil surface during the growing season (Hansen et al. 1995), and the vegetation is tolerant of prolonged flooding. The ground surface is characterized by shrubs rooted in exposed gravels and sands. Adjacent riparian vegetation may include Acer negundo, Fraxinus pennsylvanica, and Populus deltoides woodlands and Schoenoplectus pungens and Typha latifolia herbaceous communities.


Dynamic Processes

Dynamics: This association is restricted to sites that are temporarily flooded or have a shallow water table.


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): K.A. Schulz
Element Description Edition Date: 31Mar2009
Element Description Author(s): K.A. Schulz and K.S. King
NatureServe Conservation Status Factors Edition Date: 01Feb1996

Ecological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).


References
  • Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.

  • Evans, S. 1989a. Riparian survey of Washington's Columbia Basin. Unpublished report prepared for The Nature Conservancy Washington Natural Heritage Program, Olympia, Washington.

  • Hansen, P. L., R. D. Pfister, K. Boggs, B. J. Cook, J. Joy, and D. K. Hinckley. 1995. Classification and management of Montana's riparian and wetland sites. Miscellaneous Publication No. 54. Montana Forest and Conservation Experiment Station, School of Forestry, University of Montana. 646 pp. plus posters.

  • Hibner, C. D. 2009. Special project soil survey of Bandelier National Monument. Natural Resources Conservation Science. In cooperation with the USDI National Park Service and the New Mexico Agricultural Experiment Station. [in review]

  • Hinschberger, M. S. 1978. Occurrence and relative abundance of small mammals associated with riparian and upland habitats along the Columbia River. Unpublished thesis, Oregon State University, Corvallis. 78 pp.

  • IDCDC [Idaho Conservation Data Center]. 2005. Wetland and riparian plant associations in Idaho. Idaho Conservation Data Center, Idaho Department of Fish and Game, Boise. [http://fishandgame.idaho.gov/tech/CDC/ecology/wetland_riparian_assoc.cfm] (accessed 14 June 2005).

  • Kagan, J. S., J. A. Christy, M. P. Murray, and J. A. Titus. 2004. Classification of native vegetation of Oregon. January 2004. Oregon Natural Heritage Information Center, Portland. 52 pp.

  • Muldavin, E., A. Kennedy, C. Jackson, P. Neville, T. Neville, K. Schulz, and M. Reid. 2011b. Vegetation classification and map: Bandelier National Monument. Natural Resource Technical Report NPS/SCPN/NRTR--2011/438. National Park Service, Fort Collins, CO.

  • Von Loh, J. 2000. Draft local descriptions of the vegetation associations of Ouray National Wildlife Refuge. USGS Bureau of Reclamation, Remote Sensing and GIS Group, Denver Federal Center, Denver.

  • Von Loh, J., D. Cogan, K. Schulz, D. Crawford, T. Meyer, J. Pennell, and M. Pucherelli. 2002. USGS-USFWS Vegetation Mapping Program, Ouray National Wildlife Refuge, Utah. USDI Bureau of Reclamation, Remote Sensing and GIS Group, Technical Memorandum 8260-02-03. Denver Federal Center, Denver, CO. 225 pp.

  • WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.

  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.


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