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A.115 | EcoArt 2002
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Name: A.115
Reference: EcoArt 2002
Description: Stands of the ~~Cupressus macnabiana$ Forest Alliance (A.115)$$ occur from 300-800 m elevation in the northern Sierra Nevada and southern Cascade Mountains, and in the eastern portion of the Siskiyous. The climate of this region is Mediterranean, with a distinct summer dry season and with most precipitation falling as rain in the fall and winter. The yearly precipitation varies widely from 30-80 cm. Sites supporting this alliance are usually on upper slopes and are underlain by a variety of substrates, including basalt, conglomerates, gabbro, greenstone, and ultramafic serpentine. The soils are rocky, and range from deep, clay loams to shallow, silty loams only a few cm deep. All these soils are infertile. This alliance is characterized by ~Cupressus macnabiana$ as the sole or dominant shrub or tree in the canopy. Several other conifers may occur including ~Pinus attenuata, Pinus sabiniana$, and ~Cupressus sargentii$. Broad-leaved trees, such as ~Quercus douglasii$ or ~Quercus wislizeni$, may also be present. Shrubs may be present and could include ~Ceanothus cuneatus, Arctostaphylos viscida, Eriodictyon californicum$, and, on serpentine outcrops, ~Quercus durata, Ceanothus jepsonii$, and ~Garrya congdonii (= Garrya flavescens ssp. congdonii)$. The herbaceous layer is sparse. 
Accession Code: VB.CC.923.A115
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: I.A.8.N.b
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: CUPRESSUS MACNABIANA FOREST ALLIANCE
  Code: A.115
  Common: McNab Cypress Forest Alliance
(convergence) and Synonyms:
(undetermined) Cupressus macnabiana Forest Alliance