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Populus balsamifera ssp. trichocarpa / Alnus incana Riparian Forest | NatureServe Biotics 2019
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Name: Populus balsamifera ssp. trichocarpa / Alnus incana Riparian Forest
Reference: NatureServe Biotics 2019
Description: This black cottonwood association is found in Idaho, Oregon and Washington. It has been reported from south-central Oregon on the Fremont National Forest and may occur in a few other scattered localities of eastern Oregon but without documentation. The association occurs within the Basin and Range Physiographic Province, characterized by fault-block mountains enclosing internal drainages. Another feature of the region is scattered volcanic peaks. The region has climatic features of both Pacific Maritime and Continental climates, with most of the annual precipitation falling as snow from October through March. Average annual precipitation ranges from 30-50 cm, depending upon elevation. Summers are dry and hot. Little detailed information is available for this association. It is a riparian association, occurring on alluvial deposits in valley bottom floodplains. Soils are sandy loams over stream-laid cobbles and gravels. Flooding occurs during May and June (spring snowmelt), and the water table is within a few feet of the surface, even in late September during the dry season. <i>Populus balsamifera ssp. trichocarpa</i> requires flooding and scouring to become established. Little information is available on the species composition or structure of this association. At present it is considered a forest, but quantitative data are not available, and it may actually be a woodland. It is dominated by broad-leaved deciduous trees and tall shrubs, the most important being the tree <i>Populus balsamifera ssp. trichocarpa</i> and the tall shrub/small tree <i>Alnus incana</i>. Scattered individuals of the needle-leaved evergreen tree <i>Pinus contorta</i> are present. Other shrubs include species of <i>Salix</i>. The one stand reported has an herbaceous layer dominated by the perennial sedge <i>Carex pellita</i>. Other herbaceous species may include the forbs <i>Heracleum maximum</i> and <i>Urtica dioica</i>, and other species of <i>Carex</i>. 
Accession Code: urn:lsid:vegbank.org:commConcept:29576-{447A82E2-CC27-4AB0-8A28-FE36760A010C}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 07-May-2010 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.686526 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL000667
  Translated: Black Cottonwood / Gray Alder Riparian Forest
  Scientific: Populus balsamifera ssp. trichocarpa / Alnus incana Riparian Forest
(convergence) and Synonyms:
(similar) CEGL000667
(similar) Populus balsamifera ssp. trichocarpa / Alnus incana Forest
(similar) Populus balsamifera ssp. trichocarpa / Alnus incana Forest