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Pinus contorta var. murrayana - Populus tremuloides / Spiraea douglasii Swamp Forest | NatureServe Biotics 2019
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Name: Pinus contorta var. murrayana - Populus tremuloides / Spiraea douglasii Swamp Forest
Reference: NatureServe Biotics 2019
Description: This association is described from the East Cascades ecoregion of Oregon and may be found in California. Sites are inactive floodplains in small, pumice-filled drainages at moderate elevations. <i>Populus tremuloides</i> is dominant in the tree overstory forming a moderately dense canopy. <i>Spiraea douglasii</i> forms a dense shrub layer. <i>Symphoricarpos albus</i> and <i>Arctostaphylos uva-ursi</i> are occasionally well represented. Commonly associated grasses and forbs are <i>Bromus anomalus, Elymus glaucus, Galium boreale, Maianthemum stellatum, Artemisia ludoviciana, Fragaria virginiana, Chamerion angustifolium, Achillea millefolium</i>, and <i>Viola adunca</i>. This association is successional to ~Pinus contorta / Spiraea douglasii Forest (CEGL002604)$$ except at very low elevations, where <i>Populus tremuloides</i> is climax. With overuse by livestock, <i>Populus tremuloides</i> is still well-stocked in the overstory but suckers are limited. <i>Spiraea douglasii</i> decreases in cover and <i>Carex angustata</i> is codominant with <i>Elymus glaucus, Poa pratensis</i>, and/or forbs. <i>Populus tremuloides</i> is sensitive to all but the coolest ground fire. It may cause immediate mortality or damage the bole, allowing entrance for wood-rotting fungi. <i>Populus tremuloides</i> sprouts vigorously from lateral root buds. Reduced evapotransporation demand caused by removal of the overstory may elevate water tables, increase the cover of <i>Salix</i> spp. and interfere with the success of <i>Populus tremuloides</i> regeneration. <i>Salix</i> spp. and <i>Spiraea douglasii</i> will sprout from stem bases. Clearcutting will favor <i>Populus tremuloides</i> while partial cutting will favor <i>Pinus contorta</i>. Cutting may increase the level of the water table and increase the cover of willows. 
Accession Code: urn:lsid:vegbank.org:commConcept:29066-{9159F601-C66B-42D0-BAC4-B5863434064A}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 05-Jul-2018 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.684745 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL000157
  Translated: Sierra Lodgepole Pine - Quaking Aspen / Rose Spirea Swamp Forest
  Scientific: Pinus contorta var. murrayana - Populus tremuloides / Spiraea douglasii Swamp Forest
(convergence) and Synonyms:
(similar) Pinus contorta var. murrayana - Populus tremuloides / Spiraea douglasii Forest
(similar) CEGL000157
(similar) Pinus contorta var. murrayana - Populus tremuloides / Spiraea douglasii Forest