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Populus balsamifera ssp. trichocarpa - Populus tremuloides - Conifer / Cornus sericea Riparian Forest | NatureServe Biotics 2019
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Name: Populus balsamifera ssp. trichocarpa - Populus tremuloides - Conifer / Cornus sericea Riparian Forest Reference: NatureServe Biotics 2019 Description: This association is known from the bottom of large glacial troughs, on low terraces and moderate to steep slopes at elevations ranging from 1293 to 1464 m (4240-4800 feet) east of the Continental Divide in Glacier National Park, Montana. The association is found on glacial-fluvial and lacustrine deposits with well-drained sandy loam to clay loam soils. This association is known from avalanche chutes and from a bottomland stand bordering a spring-fed stream. This association consists of a multi-aged canopy dominated by <i>Populus balsamifera ssp. trichocarpa</i> and <i>Picea engelmannii</i> with lesser amounts of <i>Pseudotsuga menziesii</i> and <i>Abies lasiocarpa</i>. Conifer species are always present, with <i>Picea engelmannii</i> being most characteristic; however, <i>Abies lasiocarpa</i> and <i>Pseudotsuga menziesii</i> are present as seedlings and saplings. <i>Betula papyrifera</i> is present in half the stands with up to 10% cover. <i>Cornus sericea</i> is present in all stands with variable height and multiple ages. With up to 70% cover, it can dominate the shrub canopies, but more often the diversity of shrubs renders no species clearly dominant. Other common variable-height shrubs include <i>Rubus parviflorus, Symphoricarpos albus</i>, and <i>Amelanchier alnifolia</i>, with average coverages of 5 to 25%. <i>Acer glabrum</i> and <i>Rhamnus alnifolia</i> are less frequently present but can have high cover. <i>Elymus glaucus</i> has high constancy but low cover. Forb diversity is high, but the only species with more than trace cover is <i>Heracleum maximum</i>, which has low constancy. In at least one stand (surrounding a spring-fed stream), the forb level is likely kept low by snow and water levels most of the season. Mosses are present with 5 to 10% cover, and the ground cover is otherwise made up of litter and woody debris.  Accession Code: urn:lsid:vegbank.org:commConcept:34558-{6A49BE2E-9097-42FE-9EE3-944896ECD567} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Mar-2007 to: ongoing
	status: accepted Community's Parent: Populus balsamifera ssp. trichocarpa Northern Rocky Mountain Riparian Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.730784 NatureServe Explorer   Code: CEGL005905   Translated: Black Cottonwood - Quaking Aspen - Conifer / Red-osier Dogwood Riparian Forest   Scientific: Populus balsamifera ssp. trichocarpa - Populus tremuloides - Conifer / Cornus sericea Riparian Forest (convergence) and Synonyms: (similar) Populus balsamifera ssp. trichocarpa - Conifer / Cornus sericea Forest (similar) Populus balsamifera ssp. trichocarpa - Populus tremuloides - Conifer / Cornus sericea Forest