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A.178 | EcoArt 2002
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Name: A.178
Reference: EcoArt 2002
Description: Vegetation within this alliance occurs in cold, snowy environments in west-central Oregon. These are subalpine forests which occur at elevations over 1000 m, primarily west of the Cascade crest, where maritime influence and deep winter snowpacks are typical. Precipitation ranges from 150-400 cm annually, falling largely as snow, and snowpacks usually linger into June or later. These wetland forests are located on terraces along streams, in depressions, around edges of lakes, and on subirrigated slopes (which can be steep). Most stands are hydrated with seasonal ponding or flooding from snowmelt and runoff. Some sites are saturated with groundwater year-round. Soils are usually shallow, acidic, and nutrient-poor Histosols occurring over bedrock. Productivity of these sites is typically low, which discourages competition from faster growing conifers. Communities within this alliance occur at the ecotone between the subalpine and montane zones, and contain species from each zone. They are mature forests with closed to somewhat open canopies, often with multiple tree layers and copious woody debris. These are commonly mixed stands with ~Chamaecyparis nootkatensis$ dominating, but ~Abies amabilis$ or ~Tsuga mertensiana$ are important associates. ~Pseudotsuga menziesii$ and ~Pinus contorta$ may also be present. These forests have somewhat lush understories because of the abundant moisture. Shrubs such as ~Acer circinatum, Vaccinium membranaceum, Rhododendron albiflorum$, or ~Oplopanax horridus$ dominate the understory of these stands. The herbaceous layer is typically lush, and is dominated by shade-tolerant, mesic species, including ~Athyrium filix-femina, Clintonia uniflora, Tiarella trifoliata, Polystichum munitum$, and ~Carex$ spp. 
Accession Code: VB.CC.1512.A178
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Nov-1997 to: 17-Mar-2005
     
  • status: accepted
  • Community's Parent: I.A.8.N.e
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: CHAMAECYPARIS NOOTKATENSIS TEMPORARILY FLOODED FOREST ALLIANCE
  Common: Alaska Yellow-cedar Temporarily Flooded Forest Alliance
  Code: A.178
(convergence) and Synonyms:
(undetermined) Chamaecyparis nootkatensis Temporarily Flooded Forest Alliance