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Abies grandis - Alnus rhombifolia Forest Alliance | Western Ecology Working Group of...
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Name: Abies grandis - Alnus rhombifolia Forest Alliance Reference: Western Ecology Working Group of... Description: The Abies grandis - Alnus rhombifolia Forest Alliance (A.429) has been described from a very limited area of the western slope of the northern Rocky Mountains in Idaho, where the ranges of Alnus rhombifolia and Abies grandis overlap. It occurs along streams in a low-elevation (590-735 m) belt of the Salmon River watershed in north-central Idaho. Alnus rhombifolia is an obligate wetland species that is abundant along the borders of perennial foothill streams in the interior of northern California and in the low-elevation reaches of the Columbia/Snake watershed east of the Cascades. Abies grandis is a mesic forest species requiring relatively high precipitation, which generally occurs at higher elevations in the northern Rocky Mountains. The range intersection for these two species is presumably caused by cold-air drainage and stable canyon-bottom water tables, which allow Abies grandis to extend its range to relatively low elevations. Stands of this alliance occur on moist alluvial soils with regular disturbance from flooding, and generally within 5 m of flowing water. Close to the stream channel and low in microposition are dense groves or thickets of Alnus rhombifolia. Abies grandis forms a canopy over the higher streamside terraces. These two species form a mixed forest canopy over the floodplain. Associated trees (usually more than isolated individuals) include Pseudotsuga menziesii, Pinus ponderosa, and Populus balsamifera ssp. trichocarpa. Taxus brevifolia and Philadelphus lewisii often dominate in a tall-shrub layer. Other, shorter shrubs include Rosa woodsii, Crataegus douglasii, Amelanchier alnifolia, Salix scouleriana, Spiraea betulifolia, Cornus sericea, and Lonicera spp. Maianthemum stellatum, Trillium ovatum, Adenocaulon bicolor, Polystichum munitum, and Rubus parviflorus are common in the herbaceous layer. Adjacent vegetation is often Abies grandis forest.  Accession Code: VB.CC.21455.ABIESGRANDISALN Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: Abies grandis - Alnus rhombifolia Forest Alliance   Translated: Grand Fir - White Alder Forest Alliance   UID: HIGHER_CLASS_UNIT.2.124962 NatureServe Explorer   Code: A.429