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Thuja plicata - Tsuga heterophylla / Oxalis oregana Forest | Western Ecology Working Group of...
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Name: Thuja plicata - Tsuga heterophylla / Oxalis oregana Forest Reference: Western Ecology Working Group of... Description: This association occurs on the western slope of the southern Cascade Mountains and northern Klamath Mountains of Oregon. This association occurs from roughly 2200 to 4250 feet elevation, on variably moderate to occasionally very steep slopes of northeasterly aspects. Sites are typically cool bottoms, moist, and often occur near watercourses. The influence of maritime air masses from the west is moderated by the presence of the Siskiyou Mountains along the Pacific coast. Parent materials are basalt or andesite, with a few stands occurring on pumice or ash. Soils are typically deep (over 40 inches) and fertile, with the exception of those formed from pumice or ash. These are usually shallow, sterile and fragile. Over 90% of the forest floor is covered by plant litter, including rotting logs, and moss typically covers over 20% of the floor. This is a structurally diverse forest association, with a thick canopy of Pseudotsuga menziesii (dominates most stands), Thuja plicata, and Tsuga heterophylla. The dense tall-shrub stratum is dominated by Tsuga heterophylla and Thuja plicata regeneration, with some saplings of Abies concolor and Pseudotsuga menziesii. The deciduous shrub Acer circinatum occurs in patches. There is a shorter shrub layer which is a diverse mix, with only the dwarf Mahonia nervosa present in all stands, while the taller Rhododendron macrophyllum has high cover when present. The herbaceous layer is dominated by perennial forbs, variable in cover and species composition; only the perennial forb Oxalis oregana is present in all stands, with 13% average cover. Few graminoids occur.  Accession Code: VB.CC.18282.THUJAPLICATATSU Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Thuja plicata Giant Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Western Red-cedar - Western Hemlock / Redwood Sorrel Forest   UID: ELEMENT_GLOBAL.2.683519 NatureServe Explorer   Code: CEGL000483   Scientific: Thuja plicata - Tsuga heterophylla / Oxalis oregana Forest   Common: Western Red-cedar - Western Hemlock / Oregon Oxalis (convergence) and Synonyms: (undetermined) Thuja plicata - Tsuga heterophylla / Oxalis oregana Forest