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CEGL000012 Abies lowiana / Mahonia nervosa Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Sierra White Fir / Cascade Barberry Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is common on relatively dry sites with moderate temperatures in the Klamath-Siskiyou region of Oregon and possibly northwestern California. Stands are found at elevations of 915-1680 m (3000-5500 feet) on all aspects and slopes. Parent material is highly variable with texture varying between loam and sand. Pseudotsuga menziesii and Abies lowiana dominate both the overstory canopy the understory. Average cover of common shrubs include Mahonia nervosa, Symphoricarpos albus, and Rosa gymnocarpa. Common herbs are Goodyera oblongifolia, Anemone deltoidea, and Trientalis borealis ssp. latifolia. This association can be distinguished from the similar ~Pseudotsuga menziesii - Abies lowiana / Gaultheria shallon Forest (CEGL000013)$$ by the lack of Gaultheria shallon, and from the ~Abies amabilis - Abies lowiana / Mahonia nervosa Forest (CEGL000215)$$ by the lack of additional codominant tree species.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: This forest is a distinctive association. Some similar associations have been described, such as ~Pseudotsuga menziesii - Abies lowiana / Gaultheria shallon Forest (CEGL000013)$$ and ~Abies amabilis - Abies lowiana / Mahonia nervosa Forest (CEGL000215)$$, that are less distinctive and may need to be lumped into this association after additional review of the classification.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Pseudotsuga menziesii and Abies lowiana (= Abies concolor var. lowiana) dominate both the overstory canopy with 50% and 29% cover and the understory with 6% and 25% cover, respectively. Average cover of common shrubs include Mahonia nervosa (= var. nervosa) (10%), Symphoricarpos albus (4%), and Rosa gymnocarpa (2%). Common herbs are Goodyera oblongifolia, Anemone deltoidea, and Trientalis borealis ssp. latifolia (= Trientalis latifolia) with respective cover values of 1%, 2%, and 2%.
Dynamics: No Data Available
Environmental Description: This association is common on relatively dry sites with moderate temperatures in the Klamath-Siskiyou region of Oregon and possibly northwestern California. Stands are found at elevations of 915-1680 m (3000-5500 feet) on all aspects and slopes. Parent material is highly variable with texture varying between loam and sand.
Geographic Range: This association is known from the Klamath-Siskiyou region in southwestern Oregon, and possibly northwestern California.
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689467
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G4
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 1 Forest & Woodland Class | C01 | 1 |
| Subclass | 1.B Temperate & Boreal Forest & Woodland Subclass | S15 | 1.B |
| Formation | 1.B.2 Cool Temperate Forest & Woodland Formation | F008 | 1.B.2 |
| Division | 1.B.2.Nd Vancouverian Forest & Woodland Division | D192 | 1.B.2.Nd |
| Macrogroup | 1.B.2.Nd.2 Incense-cedar - Jeffrey Pine - Sierra White Fir Forest Macrogroup | M023 | 1.B.2.Nd.2 |
| Group | 1.B.2.Nd.2.a Incense-cedar - Sugar Pine - Sierra White Fir Forest & Woodland Group | G344 | 1.B.2.Nd.2.a |
| Alliance | A3674 Sierra White Fir - Douglas-fir Coastal, Cascadian & Sierran Forest Alliance | A3674 | 1.B.2.Nd.2.a |
| Association | CEGL000012 Sierra White Fir / Cascade Barberry Forest | CEGL000012 | 1.B.2.Nd.2.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: ? Abies concolor / Mahonia nervosa (Sawyer et al. 2009) [88.500.54]
= White fir / Dwarf Oregon grape / Threeleaf anemone (Atzet and McCrimmon 1990)
= White fir / Dwarf Oregon grape / Threeleaf anemone (Atzet and McCrimmon 1990)
- Atzet, T. A., D. E. White, L. A. McCrimmon, P. A. Martinez, P. R. Fong, and V. D. Randall. 1996. Field guide to the forested plant associations of southwestern Oregon. Technical Paper R6-NR-ECOL-TP-17-96. USDA Forest Service, Pacific Northwest Region, Portland, OR.
- Atzet, T., and D. L. Wheeler. 1984. Preliminary plant associations of the Siskiyou Mountains Province, Siskiyou National Forest. USDA Forest Service, Pacific Northwest Region, Portland, OR.
- Atzet, T., and L. A. McCrimmon. 1990. Preliminary plant associations of the southern Oregon Cascade Mountain Province. USDA Forest Service, Pacific Northwest Region, Siskiyou National Forest, Grants Pass, OR. 330 pp.
- 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.
- 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.
- Sawyer, J. O., T. Keeler-Wolf, and J. Evens. 2009. A manual of California vegetation. Second edition. California Native Plant Society, Sacramento CA. 1300 pp.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.