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Populus tremuloides / Carex aquatilis var. aquatilis Riparian Forest
Translated Name: Quaking Aspen / Water Sedge Riparian Forest
Unique Identifier: CEGL003442
Classification Approach: International Vegetation Classification (IVC)
Summary: This is a local wetland forest reported only from northeastern Oregon. It is known from moist, flat basins at moderate elevations in the mountains. Stands have seasonally wet, fine-textured mineral soils with evident mottling in a layer 74 cm (29 inches) below the soil surface. Populus tremuloides is the dominant tree. Picea engelmannii can be a codominant. Pinus contorta may be present with low cover. The understory, which has no shrubs, is dominated by graminoids, with Carex aquatilis var. aquatilis and Calamagrostis canadensis codominant, and Deschampsia cespitosa, Elymus glaucus, Glyceria striata, Carex jonesii, Carex deweyana, and Juncus nevadensis present. Exotics include Phleum pratense and Poa pratensis. Forbs present include Veratrum viride, Pedicularis groenlandica, Symphyotrichum foliaceum, Canadanthus modestus, Senecio serra, and Geum macrophyllum.



Classification

Classification Confidence: Low
Classification Comments: There are only two plots of this type, but it is clearly distinct from the more common Populus tremuloides / Calamagrostis canadensis Riparian Forest (CEGL000574). However, until more sites are found, the relationship to Picea engelmannii forest types will be unclear.

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.Nc - Rocky Mountain-Great Basin Montane Flooded & Swamp Forest
Macrogroup Rocky Mountain-Great Basin Montane Riparian & Swamp Forest
Group Rocky Mountain-Great Basin Montane Riparian & Swamp Forest
Alliance Quaking Aspen Riparian Forest

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

Similar Associations
Unique Identifier Name
CEGL000574 Populus tremuloides / Calamagrostis canadensis Riparian Forest



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These data are subject to substantial ongoing revision and may be out of date for some states.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
Oregon Populus tremuloides / Carex aquatilis var. aquatilis Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Populus tremuloides / Carex aquatilis var. aquatilis Association
Relationship: = - Equivalent
Reference: Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]
Related Concept Name: Populus tremuloides / Carex aquatilis
Relationship: = - Equivalent
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES306.833 Rocky Mountain Subalpine-Montane Riparian Woodland


NatureServe Conservation Status
Global Status: G1? (30Jan2007)
Rounded Global Status: G1 - Critically Imperiled
Reasons: This association is currently known only from low-gradient, mid-elevation basins in the Blue Mountains of Oregon, and probably adjacent Washington. There are only two known occurrences, and neither is protected. Within this region, Populus tremuloides communities appear to be declining due to alterations in fire, impacts from grazing, and changes in the water regime. Populus tremuloides reproduction is limited in many sites. In addition, the native understory graminoids are easily replaced with exotic species when the sites are overgrazed or when water is removed for irrigation.

Distribution
Color legend for Distribution Map
United States Distribution: OR, WApotentially occurs
Global Distribution: United States
Global Range: This association is currently known only from the Blue Mountains of eastern Oregon, although it is likely to occur in adjacent areas of Washington.

U.S. Forest Service Ecoregions
Domain Name: Dry Domain
Division Name: Temperate Steppe Regime Mountains
Province Name: Middle Rocky Mountain Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M332 Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Populus tremuloides is the dominant tree. Picea engelmannii can be a codominant. Pinus contorta may be present with low cover. The understory, which has no shrubs, is dominated by graminoids, with Carex aquatilis var. aquatilis and Calamagrostis canadensis codominant, and Deschampsia cespitosa, Elymus glaucus, Glyceria striata (= Glyceria elata), Carex jonesii, Carex deweyana, and Juncus nevadensis present. Exotics include Phleum pratense and Poa pratensis. Forbs present include Veratrum viride, Pedicularis groenlandica, Symphyotrichum foliaceum (= Aster foliaceus), Canadanthus modestus (= Aster modestus), Senecio serra, and Geum macrophyllum.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Populus tremuloides G1 Broad-leaved deciduous tree Tree canopy  
 
 
Calamagrostis canadensis G1 Graminoid Herb (field)    
 
 
Carex aquatilis var. aquatilis G1 Graminoid Herb (field)  
 
 
Phleum pratense G1 Graminoid Herb (field)      
 
 
Poa pratensis G1 Graminoid Herb (field)      
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This wetland forest is known from moist, flat basins at moderate elevations in the mountains. Stands have seasonally wet, fine-textured mineral soils with evident mottling in a layer 74 cm (29 inches) below the soil surface.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): Crowe et al. (2004)
Element Description Edition Date: 21Oct2002
Element Description Author(s): J. Kagan
NatureServe Conservation Status Factors Edition Date: 30Jan2007
NatureServe Conservation Status Factors Author(s): J. Kagan

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


References
  • Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]

  • Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.

  • 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.

  • Titus, J. H., J. A. Christy, D. Vander Schaaf, J. S. Kagan, and E. R. Alverson. 1996. Native wetland, riparian, and upland plant communities and their biota in the Willamette Valley, Oregon. Report to the Environmental Protection Agency, Region X, Seattle, WA. Willamette Basin Geographic Initiative. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.

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


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