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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 <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 (>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 (= Berberis 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 (= Disporum smithii)</i> are forbs which can be locally important. In seeps and wet areas along streams, <i>Adiantum pedatum</i> is found. <br><br>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: VB.CC.34592.CEGL000287 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.2.684035 NatureServe Explorer   Translated: Grand Fir - Western Hemlock / Western Swordfern Forest   Scientific: Abies grandis - Tsuga heterophylla / Polystichum munitum Forest   Code: CEGL000287