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Tsuga heterophylla - Picea sitchensis / Rhytidiadelphus loreus Forest Alliance | NatureServe Biotics 2019
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Name: Tsuga heterophylla - Picea sitchensis / Rhytidiadelphus loreus Forest Alliance
Reference: NatureServe Biotics 2019
Description: This alliance consists of forests of the Pacific Northwest dominated by <i>Picea sitchensis</i> and <i>Tsuga heterophylla</i> on well-drained, fresh to moist, nutrient-poor sites with thin soils, usually directly facing the ocean. The understory is variable, but species are indicators of nutrient-poor soils, such as <i>Rhytidiadelphus loreus</i>. Forests included in this alliance are dominated by <i>Picea sitchensis</i>, but <i>Tsuga heterophylla</i> and <i>Pseudotsuga menziesii</i> may codominate the canopy. Common understory species include <i>Blechnum spicant, Calamagrostis nutkaensis, Eurhynchium oreganum, Eurhynchium oreganum, Gaultheria shallon, Maianthemum dilatatum, Polystichum munitum, Rhizomnium glabrescens, Rhytidiadelphus loreus, Tiarella trifoliata</i>, and <i>Trisetum canescens</i>. This alliance is found within the maritime climate-influenced region of the Pacific Northwest, from northern Oregon to southern Alaska, usually within 50 km of tidewater and below 1000 m in elevation. Stands typically occur on coastal terraces, but extend up river valleys and seaward slopes of coastal mountains. Stands occur on moderate to steep slopes with shallow to moderately deep soils. 
Accession Code: urn:lsid:vegbank.org:commConcept:38824-{6CF9B92F-2571-4514-A1C8-298D10821BC6}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Sep-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899662 NatureServe ExplorerNatureServe Explorer logo
  Code: A3604
  Translated: Western Hemlock - Sitka Spruce / Gooseneck Moss Forest Alliance
  Common: North Pacific Western Hemlock - Sitka Spruce Forest
  Scientific: Tsuga heterophylla - Picea sitchensis / Rhytidiadelphus loreus Forest Alliance