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Alnus incana Temporarily Flooded Shrubland Alliance | Western Ecology Working Group of...
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Name: Alnus incana Temporarily Flooded Shrubland Alliance Reference: Western Ecology Working Group of... Description: Vegetation types within this riparian shrubland alliance typically occur adjacent to streams and in mountain meadows. Landforms associated with this alliance are streambanks, alluvial bars, and floodplains. Sites are young, active channel shelves that lie between active and flood-stage streambanks along second-order and larger streams in moderately graded (3-5%) valleys. Elevations range from near sea level in Alaska to 3000 m in Colorado. Soils are shallow, skeletal alluvium over water-worked cobbles and gravels. Active channel shelves have surface soil textures that are loamy sands, while older sites are silts and loam. Available water-holding capacity is low; surface water is present briefly during the growing season. The water table usually lies well below the ground surface. Alnus incana forms a dense canopy with at least 90% cover. The diverse understory shrub layer may include Cornus sericea, Betula occidentalis, Ribes hudsonianum, Symphoricarpos albus, Salix drummondiana, and Oplopanax horridus. The forb layer is sparse and may include Canadanthus modestus (= Aster modestus), Symphyotrichum spathulatum (= Aster occidentalis), Galium triflorum, Senecio triangularis, and Thalictrum occidentale. The graminoid layer is usually dominated by 1 or 2 species that include Agrostis stolonifera and Calamagrostis canadensis. The fern and fern allies layer is generally dense with at least 40% cover. The dominant species typically are Gymnocarpium dryopteris and Athyrium filix-femina.  Accession Code: VB.CC.18875.ALNUSINCANATEMP 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: Alnus incana Temporarily Flooded Shrubland Alliance   Translated: Speckled Alder Temporarily Flooded Shrubland Alliance   UID: HIGHER_CLASS_UNIT.2.126525 NatureServe Explorer   Code: A.950