Name:
Thuja plicata - Alnus rubra / Sambucus racemosa / Lysichiton americanus Swamp Forest
Reference:
NatureServe Biotics 2019
Description:
This small-patch uncommon swamp forest community is localized within the deepest rainshadow around the Straight of Georgia, in the Moist Maritime Coastal Douglas-fir Subzone (CDFmm) within the Puget Trough (TNC Ecoregion 2). It is restricted to relatively small, specialized, low-gradient lower slope or depressional seepage-receiving sites, or it may be found in association with other wetland communities along low-gradient drainages and around the margins of ponds or lakes. The soils in these swamp forests are often a mosaic of drier, elevated microsites and mounds with moder and mull humus forms, within a variable thickness matrix of wet or submerged well-humified organic materials. <i>Thuja plicata</i> is typically the leading tree species, accompanied by variable coverage of <i>Alnus rubra, Acer macrophyllum, Tsuga heterophylla</i>, and <i>Picea sitchensis</i>. <i>Rubus spectabilis, Oemleria cerasiformis, Sambucus racemosa, Vaccinium parvifolium, Frangula purshiana</i>, and <i>Gaultheria shallon</i> are common in the well-developed shrub layer. The species-rich herb layer includes <i>Athyrium filix-femina, Lysichiton americanus, Stachys chamissonis</i>, and <i>Equisetum telmateia</i>. The moderately developed, species-poor moss layer has a scattering of <i>Eurhynchium praelongum, Mnium</i> spp., and <i>Leucolepis acanthoneuron</i>. These sites are distinguished by their low-gradient wetland habitats, a canopy with leading <i>Thuja plicata</i> and <i>Alnus rubra</i>, and an herb/moss layer which features <i>Athyrium filix-femina, Lysichiton americanus</i>, and <i>Eurhynchium praelongum</i>.
Accession Code:
urn:lsid:vegbank.org:commConcept:31749-{8F6F05A9-F9B6-4967-9E1F-2E7299B4B6FE}
Plot-observations of this Community Concept:
0
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