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CEGL000881 Pinus ponderosa - Quercus garryana / Balsamorhiza sagittata Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Ponderosa Pine - Oregon White Oak / Arrowleaf Balsamroot Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This mixed evergreen-deciduous woodland occupies hot, dry sites between 645-1060 m elevation on the eastern slope of the Oregon Cascades. Stands normally grow on ridges and upper slope positions of south-facing hillsides. Temperatures are very warm during the growing season and precipitation is low. These conditions limit the cover of trees and shrubs. The tree canopy is dominated by Pinus ponderosa and Quercus garryana with an occasional Pseudotsuga menziesii. Average tree cover is 50%, with Pinus ponderosa slightly more dominant than Quercus garryana. Trees are short and sparse. The shrub layer is also quite sparse, generally confined to small amounts of Ceanothus prostratus, Ceanothus integerrimus, or Symphoricarpos sp. Average cover of shrubs is only about 5%. The herbaceous flora is diverse, with Balsamorhiza sagittata the diagnostic species. Lupinus caudatus and Lomatium triternatum are always present and conspicuous. The graminoid layer is dominated by Festuca idahoensis and Pseudoroegneria spicata. This association has sparser shrub cover than ~Pinus ponderosa - Quercus garryana / Purshia tridentata Woodland (CEGL000883)$$.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: No Data Available
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: The evergreen needle-leaved tree Pinus ponderosa dominates an open, woodland canopy, with 30% cover. The broad-leaved deciduous tree Quercus garryana averages 12% cover. Pseudotsuga menziesii occurs infrequently; no other trees are present. The trees are typically short and sparse, with varying ages. The shrub layer is sparse, with small amounts (<5% cover total) of Ceanothus prostratus and Symphoricarpos spp. The herbaceous layer is diverse, with a mix of perennial forbs and grasses, most notably the forbs Balsamorhiza sagittata, Lomatium triternatum, Lupinus caudatus, and Hieracium scouleri var. albertinum (= Hieracium albertinum), and the bunchgrasses Festuca idahoensis, Koeleria macrantha, and Pseudoroegneria spicata. Total herbaceous cover averages 30-40%.
Dynamics: No Data Available
Environmental Description: This association is found on the eastern side of the Cascade Range crest in a region with a steep precipitation gradient created by topographic rainshadow effects. It occupies hot, dry sites at elevations from 640 to 1000 m (2100-3300 feet). Average annual precipitation is only 74 cm (29 inches), and temperatures are very high during the growing season. This association occurs on the south-facing portions of major ridges, usually on ridgetops and moderate to somewhat steep, mid to upper slopes. Parent materials are conglomerate or ash. Soils are generally dry, shallow (but can be deep), and have silt loam to loam textures. Organic matter accumulations are low because of both little leaf litter and frequent fires.
Geographic Range: This association is very local, with all known sites located within the area between Badger Creek and Jordan Creek, on the southeastern side of Mount Hood, on the Barlow Ranger District of the Mount Hood National Forest.
Nations: US
States/Provinces: OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.684242
Confidence Level: Moderate
Confidence Level Comments: No Data Available
Grank: G2
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 | A3327 Oregon White Oak - Ponderosa Pine / Geyer''s Sedge Woodland Alliance | A3327 | 1.B.2.Nd.1.b |
| Association | CEGL000881 Ponderosa Pine - Oregon White Oak / Arrowleaf Balsamroot Woodland | CEGL000881 | 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: = Pinus ponderosa - Quercus garryana / Balsamorhiza sagittata (Topik et al. 1988) [(p.43)]
- 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.
- Topik, C., N. M. Halverson, and T. High. 1988. Plant associations and management guide of the ponderosa pine, Douglas-fir, and grand fir zone, Mt. Hood National Forest. R6-ECOL-TP-004-88. USDA Forest Service, Pacific Northwest Region, Portland, OR. 136 pp.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.