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Pseudotsuga menziesii - Abies grandis / Gaultheria shallon - Holodiscus discolor Forest | NatureServe Biotics 2019
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Name: Pseudotsuga menziesii - Abies grandis / Gaultheria shallon - Holodiscus discolor Forest Reference: NatureServe Biotics 2019 Description: This association is currently described from San Juan Island National Historical Park, Washington. Additional global information will be added when available. In Washington, this association occurs in the San Juan Islands, islands in western Skagit County, northern and central Whidbey Island, and possibly the far northeastern Olympic Peninsula. It probably also occurs in adjacent British Columbia on the Gulf Islands and southeastern Vancouver Island, but is recognized as part of a broader unit there. This association is limited to dry climatic areas and occurs on moderately dry and relatively nutrient-poor sites. Most stands are within 1 mile of saltwater shorelines. Slopes are usually gentle and occasionally moderate in steepness. Aspect is variable. The association is often found on parent materials consisting of glacial till but also includes glacial drift without a restrictive layer. Stony or gravelly loams are the most typical soil types. Fire is the primary natural disturbance. Old-growth stands show evidence of past low- to moderate-severity fire. <i>Pseudotsuga menziesii</i> dominates the upper canopy. <i>Abies grandis</i> can be a codominant. <i>Abies grandis</i> dominates tree regeneration or a lower canopy layer. <i>Picea sitchensis</i> is occasionally prominent. <i>Thuja plicata</i> is sometimes present in small amounts. <i>Gaultheria shallon</i> dominates the understory while <i>Holodiscus discolor</i> usually forms a prominent to codominant tall-shrub layer. <i>Rosa gymnocarpa</i> and <i>Rubus ursinus</i> are usually present. The herb layer is poorly developed. <i>Festuca occidentalis, Pteridium aquilinum var. pubescens</i>, and <i>Polystichum munitum</i> are usually present in small amounts. The absence of fire results in <i>Abies grandis</i> increasing and <i>Pseudotsuga menziesii</i> decreasing, although <i>Pseudotsuga menziesii</i> still remains prominent after hundreds of years. Some of these stands may have been <i>Pseudotsuga menziesii</i> savannas prior to fire suppression. Depending on seed sources, <i>Arbutus menziesii</i> or <i>Pinus contorta var. contorta</i> could regenerate abundantly on these sites after a major disturbance and persist until sometime in the middle of the sere. Most occurrences have been displaced or degraded by development. The vast majority of extant stands have been significantly impacted by past timber harvest. Development is an ongoing threat. The type has a limited geographic range.  Accession Code: urn:lsid:vegbank.org:commConcept:35581-{D24351C6-5D88-4365-A0E2-AB1A45682C06} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 10-Jul-2018 to: ongoing
	status: accepted Community's Parent: Pseudotsuga menziesii - Abies grandis - Arbutus menziesii Forest & Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.979500 NatureServe Explorer   Code: CEGL007331   Translated: Douglas-fir - Grand Fir / Salal - Oceanspray Forest   Scientific: Pseudotsuga menziesii - Abies grandis / Gaultheria shallon - Holodiscus discolor Forest