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Abies grandis - Tsuga heterophylla / Polystichum munitum Forest | Western Ecology Working Group of...
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Name: Abies grandis - Tsuga heterophylla / Polystichum munitum Forest Reference: Western Ecology Working Group of... Description: Giant Pseudotsuga menziesii old-growth trees dominate the overstory of these closed-canopy, valley bottom and river terrace forests. Abies grandis, Tsuga heterophylla, and Thuja plicata are the dominant understory trees, usually with a few individuals in the canopy. Giant (>6 feet tall) Polystichum munitum dominate the understory, usually with over 60% cover. Corylus cornuta, Oemleria cerasiformis, Taxus brevifolia, and Acer macrophyllum can form a subcanopy in moist alluvial soils or rocky areas. Vaccinium parvifolium, Mahonia nervosa (= Berberis nervosa), and Gaultheria shallon are occasional low shrubs, while Oxalis oregana, Trillium ovatum, Maianthemum dilatatum, Rubus ursinus, and Prosartes smithii (= Disporum smithii) are forbs which can be locally important. In seeps and wet areas along streams, Adiantum pedatum is found. Both fire and flooding are important processes in these habitats, although both occur infrequently. The terraces are usually well above the river, impacted only by 100+ year flood intervals, but dependent on the deep alluvial deposits for their productivity. Most of the old-growth trees present have evident fire scars, although the presence of 100-200 year old, fire-sensitive Thuja plicata, Tsuga heterophylla and Abies grandis individuals is evidence of a fairly long fire-return interval. This type is known from medium streams to large rivers, but rarely along small or seasonal streams.  Accession Code: VB.CC.19080.ABIESGRANDISTSU 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: Abies grandis Giant Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Grand Fir - Western Hemlock / Pineland Sword Fern Forest   UID: ELEMENT_GLOBAL.2.684035 NatureServe Explorer   Code: CEGL000287   Scientific: Abies grandis - Tsuga heterophylla / Polystichum munitum Forest (convergence) and Synonyms: (undetermined) Abies grandis - Tsuga heterophylla / Polystichum munitum Forest