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Quercus garryana Forest Alliance | Western Ecology Working Group of...
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Name: Quercus garryana Forest Alliance Reference: Western Ecology Working Group of... Description: Vegetation within this alliance is found in low-elevation (15-610 m) valleys and slopes of the Pacific Northwest, usually on the leeward side of the coastal ranges. Precipitation ranges from 50-200 cm annually, with a decidedly warm, dry period in midsummer. Environmental factors that limit the invasion and increase of conifers play an important role in the maintenance and functioning of these communities; foremost in importance are soil drought and fire. These communities are associated with excessively drained soils, or sometimes riparian areas and wetland transitions in prairie landscapes. Best stand development occurs on well-drained alluvial soils and mild slopes. This is one of the most drought-tolerant communities of the maritime Pacific Northwest. Vegetation within this alliance is characterized by a closed canopy of Quercus garryana, a winter-deciduous tree. Occasionally there are scattered emergent individuals of Pseudotsuga menziesii or, less often, Pinus ponderosa. Acer macrophyllum is often an associated tree. There is often a tall-shrub stratum of Corylus cornuta var. californica or Amelanchier alnifolia. A lower shrub stratum of Toxicodendron diversilobum is common in stands west of the Cascade Mountains. In outlying eastern stands, a shrub understory typical of adjacent steppe, including Purshia tridentata or Artemisia tridentata, occurs. Many forb species can be found in these forests; some of the more common or important include Camassia quamash, Osmorhiza berteroi (= Osmorhiza chilensis), Perideridia bolanderi, Apocynum androsaemifolium (= Apocynum pumilum), Brodiaea elegans, Fragaria vesca, Fragaria virginiana, Galium triflorum, Vicia americana, Achillea millefolium, or Maianthemum stellatum. Adjacent vegetation often includes Pseudotsuga menziesii, Pinus ponderosa, or Abies grandis forest communities, or valley grasslands.  Accession Code: VB.CC.19821.QUERCUSGARRYANA Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Translated: Oregon White Oak Forest Alliance   Scientific: Quercus garryana Forest Alliance   UID: HIGHER_CLASS_UNIT.2.124598 NatureServe Explorer   Code: A.262