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Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Riparian Forest | NatureServe Biotics 2019
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Name: Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Riparian Forest
Reference: NatureServe Biotics 2019
Description: This uncommon association is known from scattered locations in Glacier National Park, Montana, and Waterton Lakes National Park, Alberta. This forest association is found at 949 m (3110 feet) elevation on the basin floor of a wide river valley (on an old river meander) and at 1380 m (4525 feet) elevation on a gentle west-facing slope in bottomlands. The association occurs on silty loam soils on glacio-fluvial deposits. Stands vary from saturated much of the year to seasonally flooded but are moderately well-drained by early autumn. <i>Picea engelmannii</i> and <i>Populus balsamifera ssp. trichocarpa</i> dominate the multi-layered canopy, with <i>Equisetum arvense</i> abundant in the herbaceous layer. <i>Picea engelmannii</i> has an average cover of 23% in the tree canopy with trace cover of younger trees and seedlings in other layers. <i>Populus balsamifera ssp. trichocarpa</i> has 35% cover in the tree canopy, 15% in the tree subcanopy, and 3% cover of saplings and seedlings. In more mesic stands, <i>Symphoricarpos albus</i> clearly dominates the shrub layer with 60% cover. Other shrubs with 50% constancy but noticeable cover were <i>Cornus sericea, Symphoricarpos occidentalis, Rubus pubescens</i>, and <i>Crataegus douglasii</i>. The herbaceous layer is dominated by <i>Equisetum arvense</i>, which ranges from 10% to 70% cover. Tall forbs are conspicuous, such as <i>Maianthemum</i> species and <i>Heracleum maximum</i>. Mosses have 0 to 10% cover in both sites, and litter and duff cover up to 80% of the ground. 
Accession Code: urn:lsid:vegbank.org:commConcept:34560-{7AF5ED31-038D-4000-8C2E-5C754A34CB3C}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 20-Feb-2004 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.730795 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL005907
  Translated: Black Cottonwood - Engelmann Spruce / Field Horsetail Riparian Forest
  Scientific: Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Riparian Forest
(convergence) and Synonyms:
(similar) Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Forest
(similar) Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Forest