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CEGL000068 Pseudotsuga menziesii / Mahonia nervosa Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Douglas-fir / Cascade Barberry Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This giant forest association is found in the Klamath Mountains in southern Oregon and may also occur in California. Elevations range from 700-1130 m (2300-3700 feet). Sites are on northeast to northwest aspects with slopes averaging 54%. Soils are derived from metavolcanic, schists, metasediment, andesite and basaltic parent material. Pseudotsuga menziesii is the only tree to occur at most sites. The tree understory is characterized by Pseudotsuga menziesii, Arbutus menziesii, and Acer macrophyllum. The shrub layer is typified by Mahonia nervosa, Rosa gymnocarpa, and Corylus cornuta var. cornuta. Herbs include Trientalis borealis ssp. latifolia and Prosartes hookeri.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: Atzet and McCrimmon (1990) and Atzet et al. (1996) classified this association as Pseudotsuga menziesii / Berberis nervosa / Polystichum munitum because of 9-12% cover of the later species in all three of their plots. Jimerson et al. (1995) described a Pseudotsuga menziesii / Acer circinatum - Berberis nervosa type that is similar, but riparian, while their Pseudotsuga menziesii / Rhododendron macrophyllum - Berberis nervosa and Pseudotsuga menziesii / Castanopsis chrysophylla - Lithocarpus densiflorus / Berberis nervosa types are drier than vegetation included in this association.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Pseudotsuga menziesii is the only tree to occur at most sites and has an average cover of 72%. The tree understory is characterized by Pseudotsuga menziesii (50%), Arbutus menziesii (5%), and Acer macrophyllum (45%). The shrub layer totals 64% and is typified by Mahonia nervosa (= var. nervosa) (23%), Rosa gymnocarpa (6%), and Corylus cornuta var. cornuta (8%). Herbs include Trientalis borealis ssp. latifolia (= Trientalis latifolia) (4%) and Prosartes hookeri (= Disporum hookeri) (2%).
Dynamics: No Data Available
Environmental Description: This giant forest association is found in the Klamath Mountains in southern Oregon and may also occur in California. Elevations range from 700-1130 m (2300-3700 feet). Sites are on northeast to northwest aspects with slopes averaging 54%. Soils are derived from metavolcanic, schists, metasediment, andesite and basaltic parent material.
Geographic Range: This association is found in the Klamath-Siskiyou region of Oregon and possibly northern California where habitats are moist enough that Pinus spp. would not be important, but outside the coastal fog belt where Notholithocarpus densiflorus would dominate the understory. However, the association remains fairly widespread.
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.687866
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G3
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.1 Southern Vancouverian Dry Foothill Forest & Woodland Macrogroup | M886 | 1.B.2.Nd.1 |
| Group | 1.B.2.Nd.1.a Southern Vancouverian Dry Douglas-fir - Madrone Woodland Group | G800 | 1.B.2.Nd.1.a |
| Alliance | A3716 Douglas-fir - Grand Fir - Pacific Madrone Forest & Woodland Alliance | A3716 | 1.B.2.Nd.1.a |
| Association | CEGL000068 Douglas-fir / Cascade Barberry Forest | CEGL000068 | 1.B.2.Nd.1.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: ? Pseudotsuga menziesii / Acer circinatum - Berberis nervosa type (Jimerson et al. 1995) [similar but riparian.]
? Pseudotsuga menziesii / Berberis nervosa / Polystichum munitum (Atzet and McCrimmon 1990)
? Pseudotsuga menziesii / Berberis nervosa / Polystichum munitum (Atzet et al. 1996)
? Pseudotsuga menziesii / Castanopsis chrysophylla - Lithocarpus densiflorus / Berberis nervosa type (Jimerson et al. 1995) [drier than vegetation included in this association.]
? Pseudotsuga menziesii / Mahonia nervosa (Sawyer et al. 2009) [82.200.64]
? Pseudotsuga menziesii / Rhododendron macrophyllum - Berberis nervosa type (Jimerson et al. 1995) [drier than vegetation included in this association.]
? Pseudotsuga menziesii / Berberis nervosa / Polystichum munitum (Atzet and McCrimmon 1990)
? Pseudotsuga menziesii / Berberis nervosa / Polystichum munitum (Atzet et al. 1996)
? Pseudotsuga menziesii / Castanopsis chrysophylla - Lithocarpus densiflorus / Berberis nervosa type (Jimerson et al. 1995) [drier than vegetation included in this association.]
? Pseudotsuga menziesii / Mahonia nervosa (Sawyer et al. 2009) [82.200.64]
? Pseudotsuga menziesii / Rhododendron macrophyllum - Berberis nervosa type (Jimerson et al. 1995) [drier than vegetation included in this association.]
- 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.
- Jimerson, T. J., L. D. Hoover, E. A. McGee, G. DeNitto, and R. M. Creasy. 1995. A field guide to serpentine plant associations and sensitive plants in northwestern California. Technical Publication R5-ECOL-TP-006. USDA Forest Service, Pacific Southwest Region, San Francisco, CA.
- 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.
- Klinka, K., H. Qian, J. Pojar, and D. V. Meidinger. 1996. Classification of natural forest communities of coastal British Columbia. Vegetatio 125:149-168.
- McCain, C., and N. M. Diaz. 2002a. Field guide to the forested plant associations of the northern Oregon Coast Range. Siuslaw National Forest, USFS; Salem District, BLM; Eugene District, BLM. Technical Paper R6-NR-ECOL-TP-03-02. USDA Forest Service, Pacific Northwest Region, Portland, OR. 250 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.