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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 670 to 1300 m (2200-4250 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 102 cm [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 <i>Pseudotsuga menziesii</i> (dominates most stands), <i>Thuja plicata</i>, and <i>Tsuga heterophylla</i>. The dense tall-shrub stratum is dominated by <i>Tsuga heterophylla</i> and <i>Thuja plicata</i> regeneration, with some saplings of <i>Abies concolor</i> and <i>Pseudotsuga menziesii</i>. The deciduous shrub <i>Acer circinatum</i> occurs in patches. There is a shorter shrub layer which is a diverse mix, with only the dwarf <i>Mahonia nervosa</i> present in all stands, while the taller <i>Rhododendron macrophyllum</i> has high cover when present. The herbaceous layer is dominated by perennial forbs, variable in cover and species composition; only the perennial forb <i>Oxalis oregana</i> is present in all stands, with 13% average cover. Few graminoids occur.  Accession Code: VB.CC.32297.CEGL000483 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Nov-2014 to: 01-May-2019
	status: accepted This Community's Level: association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.683519 NatureServe Explorer   Translated: Western Red-cedar - Western Hemlock / Redwood Sorrel Forest   Scientific: Thuja plicata - Tsuga heterophylla / Oxalis oregana Forest   Code: CEGL000483