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Abies lowiana - Abies magnifica var. magnifica - Abies magnifica var. shastensis Forest Alliance | NatureServe Biotics 2019
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Name: Abies lowiana - Abies magnifica var. magnifica - Abies magnifica var. shastensis Forest Alliance
Reference: NatureServe Biotics 2019
Description: Associations are usually mixed forests with at least two of these conifers: <i>Abies lowiana, Abies magnifica var. shastensis, Abies magnifica var. magnifica</i>, or <i>Abies procera</i>; however, several other conifers may also be present in the tree canopy. Canopy density is influenced by variable-severity burns or by edaphic conditions (granitic sands in the Siskiyou Mountains and volcanic ash in the Cascades). This alliance occurs from the western slope of the Oregon Cascades near the Rogue-Umpqua divide, south through the Klamath-Siskiyou mountain region to Lassen Peak, California, on the east side of the Cascades in extreme southern Oregon, and is also widespread at high cool elevations in central and southern Sierra Nevada (1983-2440 m [6500-8000 feet]). In the southern Cascade Range and Siskiyou Mountains it is found at elevations of 1500-2000 m. The climate is cool and wet with annual precipitation totals of 100-300 cm, and moderate (1-3 m) snow accumulations. Summers are usually dry, and soil moisture is dependent upon winter snowpacks, which may be heavy but of shorter duration than in the subalpine zone. Precipitation decreases eastward, especially east of the crest of the Siskiyou Mountains. Soils are usually deep and composed of deep fractured granitics or volcanic ash deposits with surface organic layers. In both cases the parent materials have weathered to sandy-textured soils. These forests occupy steep slopes in deeply dissected topography. 
Accession Code: urn:lsid:vegbank.org:commConcept:38892-{68D79711-FCD0-4FB6-A3DF-7A39DA966072}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 18-Dec-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899730 NatureServe ExplorerNatureServe Explorer logo
  Code: A3678
  Translated: Sierra White Fir - California Red Fir - Shasta Red Fir Forest Alliance
  Common: White Fir - California Red Fir - Shasta Red Fir Forest
  Scientific: Abies lowiana - Abies magnifica var. magnifica - Abies magnifica var. shastensis Forest Alliance