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CEGL000928 Pseudotsuga menziesii - Quercus garryana / Toxicodendron diversilobum Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Douglas-fir - Oregon White Oak / Pacific Poison-oak Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This woodland community occurs in the Willamette Valley of northwestern Oregon, south into California and probably north into Washington. Stands are most common on south and western aspects on low slopes (<20%). Soils are most often sedimentary in origin. Examples of this community are usually composed of younger Quercus garryana and Pseudotsuga menziesii forming a closed canopy. The understory cover is dominated by Toxicodendron diversilobum with lesser amounts of Polystichum munitum, Festuca rubra, and introduced species including Rosa rubiginosa, Holcus lanatus, Poa pratensis, Agrostis spp., and Dactylis glomerata. Quercus garryana seedlings accounted for 6% cover while no Pseudotsuga menziesii are reported in plots, but are probably present. The codominance of mature Pseudotsuga menziesii is likely a result of the suppression of fires that normally would have maintained an oak woodland free of substantial conifer cover.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: Thilenius'' (1968) Quercus / Rhus community description and Smith''s (1985) Pseudotsuga menziesii / Quercus garryana / Rhus diversiloba / Polystichum munitum type were used to describe this type. This information is very rudimentary.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Quercus garryana and Pseudotsuga menziesii dominate the tree canopy. The understory cover is dominated by Toxicodendron diversilobum (40-95%) with lesser amounts of Polystichum munitum (0-58%), Festuca rubra (2%), and introduced species including Rosa rubiginosa (= Rosa eglanteria) (5%), Holcus lanatus (2%), Poa pratensis (5%), Agrostis spp. (2%), and Dactylis glomerata (3%). Quercus garryana seedlings accounted for 6% cover while no Pseudotsuga menziesii are reported in plots, but are probably present. The codominance of mature Pseudotsuga menziesii is likely a result of the suppression of fires that normally would have maintained an oak woodland free of substantial conifer cover.
Dynamics: No Data Available
Environmental Description: Stands are most common on south and western aspects on low slopes (<20%). Soils are most often sedimentary in origin.
Geographic Range: This association occurs in the Umpqua and Willamette River watersheds in Oregon, California, and probably stretches north to the Puget Trough of Washington.
Nations: US
States/Provinces: CA, OR, WA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.686627
Confidence Level: Low - Poorly Documented
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.b Oregon White Oak - Ponderosa Pine - Douglas-fir Forest & Woodland Group | G206 | 1.B.2.Nd.1.b |
| Alliance | A3328 Oregon White Oak - Douglas-fir / Pacific Poison-oak Forest & Woodland Alliance | A3328 | 1.B.2.Nd.1.b |
| Association | CEGL000928 Douglas-fir - Oregon White Oak / Pacific Poison-oak Woodland | CEGL000928 | 1.B.2.Nd.1.b |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: ? Pseudotsuga menziesii / Quercus garryana / Rhus diversiloba / Polystichum munitum type (Smith 1985)
? Quercus / Rhus community (Thilenius 1968)
? Quercus / Rhus community (Thilenius 1968)
- 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.
- ORNHP [Oregon Natural Heritage Program]. No date. Unpublished data files. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.
- Riegel, G. M., B. G. Smith, and J. F. Franklin. 1992. Foothill oak woodlands of the interior valleys of southwestern Oregon. Northwest Science 66(2):66-76.
- Smith, W. P. 1985. Plant associations within the interior valleys of the Umpqua River Basin, Oregon. Journal of Range Management 38:526-530.
- Thilenius, J. F. 1968. The Quercus garryana forests of the Willamette Valley, Oregon. Ecology 49:1124-1133.
- 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.