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Populus balsamifera ssp. trichocarpa - Pinus jeffreyi Riparian Forest | NatureServe Biotics 2019
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Name: Populus balsamifera ssp. trichocarpa - Pinus jeffreyi Riparian Forest
Reference: NatureServe Biotics 2019
Description: This forest association is currently only known from Yosemite National Park in California, and the following description is based on occurrences there. Additional information will be added as it becomes available. This forest grows between 2100 and 2370 m (6900-7780 feet) elevation on gentle to moderate slopes with southerly to southeasterly exposures. Stands are found in valley bottoms along streams, or occasionally midslopes with soils that are seasonally or permanently flooded. Soils are sands to silty loams derived from igneous rock and may be moderately well-drained to well-drained. This forest is characterized by a broken tall canopy of <i>Pinus jeffreyi</i> that may reach 35-50 m, but is more regularly 15-20 m tall. Dominance is shared between <i>Populus balsamifera</i> and <i>Pinus jeffreyi</i> in a fairly continuous canopy. <i>Populus tremuloides</i> is also regularly present. Individuals of <i>Abies lowiana</i> are also present, and <i>Juniperus occidentalis</i> may also be present in low cover. Occasionally <i>Pinus jeffreyi</i> may also be present as trees or saplings. The shrub layer is dominated by <i>Rosa woodsii</i> along with <i>Artemisia tridentata</i> and /or <i>Symphoricarpos rotundifolius</i>. The ground layer is dominated by graminoids. Most stands contain <i>Poa pratensis</i> and <i>Elymus elymoides</i>. The herbaceous layer is sparse but relatively diverse. <i>Wyethia mollis, Allium bisceptrum, Calochortus superbus, Iris missouriensis</i>, and/or <i>Maianthemum stellatum</i> all occur at low cover. 
Accession Code: urn:lsid:vegbank.org:commConcept:36668-{0229D80B-1562-4AD7-A5A5-3B6DA96C9523}
Plot-observations of this Community Concept: 3
      Party Perspective according to: NatureServe (organization)
Perspective from: 06-May-2010 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.689682 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL008620
  Translated: Black Cottonwood - Jeffrey Pine Riparian Forest
  Scientific: Populus balsamifera ssp. trichocarpa - Pinus jeffreyi Riparian Forest
(convergence) and Synonyms:
(similar) CEGL008620
(similar) Populus balsamifera ssp. trichocarpa - Pinus jeffreyi Forest
(similar) Populus balsamifera ssp. trichocarpa - Pinus jeffreyi Forest