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A.919 | EcoArt 2002
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Name: A.919 Reference: EcoArt 2002 Description: This alliance occurs in scattered locations at low to mid elevations of the western U.S. Sites typically occur along streams, rivers, lakes and ponds, and on terraces. It also is found in canyons or steep gullies and along arroyos. Elevations range from 716 m to about 1600 m in Montana, Wyoming and Colorado, and up to 2440 m in Nevada. In some places the alliance occurs on side slopes of hillsides, immediately below a seep or spring. Some examples of this alliance have been placed into an intermittently or temporarily flooded hydrologic regime. Soils are usually well-developed, older, and well-drained, formed in shallow to deep alluvial deposits. These soils have higher fertility and afford good rooting depth. Textures range from silt to sandy loams, often becoming skeletal at depth. ~Prunus virginiana$ can tolerate weakly saline soils, but is intolerant of poor drainage and prolonged flooding. This alliance is characterized by a tall, dense layer of shrubs, primarily of ~Prunus virginiana$. In the absence of disturbance, this species can form dense, monotypic thickets. With grazing or browsing disturbance, stands become more open allowing other shrubs to become common, including ~Symphoricarpos occidentalis, Rosa woodsii, Ribes aureum$, and, in Oregon, ~Sambucus caerulea$. The woody vine ~Toxicodendron rydbergii$ is present in most stands, as are the forbs ~Maianthemum stellatum$ and ~Galium triflorum$. The herbaceous layer is typically not abundant, although stands with an open shrub canopy will typically have a component of weedy forbs and graminoids. A few scattered ~Juniperus scopulorum$ also occur.  Accession Code: VB.CC.2543.A919 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Mar-2005
	status: accepted Community's Parent: III.B.2.N.a This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: PRUNUS VIRGINIANA SHRUBLAND ALLIANCE   Code: A.919   Common: Choke Cherry Shrubland Alliance (convergence) and Synonyms: (undetermined) Prunus virginiana Shrubland Alliance