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Pinus contorta / Spiraea douglasii Forest
Translated Name: Lodgepole Pine / Rose Spirea Forest
Unique Identifier: CEGL002604
Classification Approach: International Vegetation Classification (IVC)
Summary: This association is common in Oregon at moderate elevations (4100-5300 feet) in the western part of the East Cascades ecoregion and is common on the eastern fringe of the East Cascades ecoregion at higher elevation (4800-5800 feet). It may also be found in California. This transitional association is common on several landforms, including (1) low-gradient, shallowly incised, pumice-filled drainages and basins, (2) narrow, deeply incised, moderate-gradient drainages with narrow floodplains, and (3) moderate-gradient, narrow floodplains in deep valleys in the vicinity of the Cascade Range and Yamsay Mountain in the Cascades. Soils are derived from deep pumice alluvium or air-laid pumice. Surface textures range from loamy sand to fine sandy loam. Available water-holding capacity is moderately low. There is insignificant accumulation of organic matter in the soil surface. Subsurface soils are of very coarse pumice. Maximum water tables are 15-60 cm below the soil surface in May and June. The water table lowers to 90-120 cm below the soil surface in August and September. The association is characterized by an overstory of Pinus contorta and a dense shrub layer dominated by Spiraea douglasii. Pinus contorta is climax and other conifers are scattered. Arctostaphylos uva-ursi is common on most plots. On two plots, Ribes montigenum is the most abundant shrub. Willows and sedges are absent or restricted to moist microsites. Grasses are poorly represented; Elymus glaucus is the only consistent grass found on the sample plots. The relatively dry forb layer includes Achillea millefolium, Fragaria virginiana, Galium boreale, Maianthemum stellatum, and Trifolium longipes. With overuse by livestock, Spiraea douglasii decreases in cover because of trampling. Disturbances are more likely to result in an increase in the cover of bare ground rather than a dramatic increase in grasses and forbs. Wildfire was probably common in this type. Soils are dry by mid-summer and fire can easily encroach from adjacent uplands. Spiraea douglasii will resprout from the stem base. Fire will not change the vegetative composition of the association except for its impacts on Pinus contorta.



Classification

Classification Confidence: Low - Poorly Documented

Vegetation Hierarchy
Class 1 - Forest & Woodland
Subclass 1.B - Temperate & Boreal Forest & Woodland
Formation 1.B.2 - Cool Temperate Forest & Woodland
Division 1.B.2.Nb - Rocky Mountain Forest & Woodland
Macrogroup Rocky Mountain Subalpine-High Montane Forest
Group Rocky Mountain Lodgepole Pine Forest & Woodland
Alliance Rocky Mountain-East Cascadian Lodgepole Pine Forest

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
Oregon Pinus contorta ssp. latifolia / Spiraea douglasii Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Pinus contorta / Spiraea douglasii / forb
Relationship: ? - Undetermined
Reference: Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.
Related Concept Name: Pinus contorta / Spiraea douglasii / Carex eurycarpa
Relationship: ? - Undetermined
Reference: Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.
Related Concept Name: Pinus contorta var. latifolia / Spiraea douglasii / Carex angustata Association
Relationship: F - Finer
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: Pinus contorta var. latifolia / Spiraea douglasii Association
Relationship: F - Finer
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]

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES306.820 Rocky Mountain Lodgepole Pine Forest


NatureServe Conservation Status
Global Status: G3G4 (01Feb1996)
Rounded Global Status: G3 - Vulnerable

Distribution
Color legend for Distribution Map
United States Distribution: CApotentially occurs, OR
Global Distribution: United States

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Marine Regime Mountains
Province Name: Cascade Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M242 Occurrence Status: Confident or certain
Section Name: Eastern Cascades Section
Section Code: M242C Occurrence Status: Confident or certain
Division Name: Mediterranean Regime Mountains
Province Name: Sierran Steppe - Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M261 Occurrence Status: Possible
Section Name: Modoc Plateau Section
Section Code: M261G Occurrence Status: Possible
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


Environmental Setting

Wetland Indicator: N


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): Crowe et al. (2004)
Element Description Edition Date: 05Jul2018
Element Description Author(s): Crowe et al. (2004)

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.

  • 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]

  • 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.

  • Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.

  • Titus, J. H., and J. A. Christy. 1996a. Vegetation of Big Marsh, Deschutes National Forest, Oregon. Report to Deschutes National Forest. Oregon Natural Heritage Program, The Nature Conservancy, Portland.

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


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Data last updated: March 2019