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Alnus rhombifolia / Sierran Riparian Forest | NatureServe Biotics 2019
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Name: Alnus rhombifolia / Sierran Riparian Forest
Reference: NatureServe Biotics 2019
Description: This association is only known from Yosemite National Park in California, and the following description is based on occurrences there. Information about its global characteristics is not available without additional inventory. It is likely that this association ranges throughout the western slope of the Sierra Nevada. Stands are found at low to mid elevations (1340-1525 m [4400-5000 feet]) on concave, hummocky and undulating, southeast- to north-facing, flat to moderately steep (0-20%) slopes. These sites tend to be along drainages, floodplains or streambeds that are intermittently flooded to permanently flooded. In general, <i>Alnus rhombifolia</i> stands require permanent moisture, whether subterranean or on the surface. In intermittently flooded streams, the stands are associated most regularly with deeper pools or short stretches of more permanently flooded substrate. Soils are generally rocky with textures ranging from sand to sandy loam and of granitic parent material. Soil is somewhat poorly to rapidly draining. Disturbance is low to medium. Stands are found forming an intermittent to continuous canopy. The shrub layer is open to continuous and the herb layer is open. This association is dominated by <i>Alnus rhombifolia</i> in narrow bands often associated with perennial steams. <i>Calocedrus decurrens</i> is often an important codominant tree. <i>Cornus nuttallii</i> and <i>Abies lowiana</i> are usually present. Other species that may be found in this association include <i>Adenocaulon bicolor, Rubus parviflorus, Claytonia perfoliata, Galium aparine, Pteridium aquilinum, Athyrium filix-femina</i>, and <i>Boykinia major</i>. <i>Dryopteris arguta</i> may be common at some sites. <i>Carex tompkinsii</i> is a rare species that may be found in this association. 
Accession Code: urn:lsid:vegbank.org:commConcept:36732-{F867EADC-4AF2-4034-A130-E3C830DD049A}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 06-May-2010 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.683847 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL008693
  Translated: White Alder / Sierran Riparian Forest
  Scientific: Alnus rhombifolia / Sierran Riparian Forest
(convergence) and Synonyms:
(similar) Alnus rhombifolia / Sierran Forest
(similar) Alnus rhombifolia / Sierran Forest