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Abies grandis - Tsuga heterophylla / Polystichum munitum Forest | NatureServe Biotics 2019
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Name: Abies grandis - Tsuga heterophylla / Polystichum munitum Forest Reference: NatureServe Biotics 2019 Description: Giant <i>Pseudotsuga menziesii</i> old-growth trees dominate the overstory of these closed-canopy, valley bottom and river terrace forests. <i>Abies grandis, Tsuga heterophylla</i>, and <i>Thuja plicata</i> are the dominant understory trees, usually with a few individuals in the canopy. Giant (&gt;6 feet tall) <i>Polystichum munitum</i> dominate the understory, usually with over 60% cover. <i>Corylus cornuta, Oemleria cerasiformis, Taxus brevifolia</i>, and <i>Acer macrophyllum</i> can form a subcanopy in moist alluvial soils or rocky areas. <i>Vaccinium parvifolium, Mahonia nervosa</i>, and <i>Gaultheria shallon</i> are occasional low shrubs, while <i>Oxalis oregana, Trillium ovatum, Maianthemum dilatatum, Rubus ursinus</i>, and <i>Prosartes smithii</i> are forbs which can be locally important. In seeps and wet areas along streams, <i>Adiantum pedatum</i> 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 <i>Thuja plicata, Tsuga heterophylla</i> and <i>Abies grandis</i> 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: urn:lsid:vegbank.org:commConcept:29196-{D4BFFBD9-896D-4D3F-B487-22B761BDA012} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: ongoing
	status: accepted Community's Parent: Tsuga heterophylla - Pseudotsuga menziesii / Rubus spectabilis Mesic Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684035 NatureServe Explorer   Code: CEGL000287   Translated: Grand Fir - Western Hemlock / Western Swordfern Forest   Scientific: Abies grandis - Tsuga heterophylla / Polystichum munitum Forest (convergence) and Synonyms: (similar) CEGL000287 (similar) Abies grandis - Tsuga heterophylla / Polystichum munitum Forest (similar) Abies grandis - Tsuga heterophylla / Polystichum munitum Forest