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Abies concolor - Chamaecyparis lawsoniana - Pseudotsuga menziesii / (Mahonia nervosa) / Achlys triphylla Forest | Western Ecology Working Group of...
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Name: Abies concolor - Chamaecyparis lawsoniana - Pseudotsuga menziesii / (Mahonia nervosa) / Achlys triphylla Forest Reference: Western Ecology Working Group of... Description: This giant coniferous forest association is codominated by Abies concolor, Chamaecyparis lawsoniana, and Pseudotsuga menziesii. Stands are found on valley bottoms and along stream courses in southwestern Oregon and adjacent northern California. Average elevation is 1280 m. These forests are usually found on moist, moderately developed, well-drained colluvial soils with the coarsest texture of any Chamaecyparis lawsoniana association. These soils are usually derived from metavolcanics or granitics which limits their fertility and water holding capacity. For these reasons canopy closure averages only 75%. The canopy is dominated by Abies concolor (5% cover),Chamaecyparis lawsoniana (17% cover), and Pseudotsuga menziesii (45% cover), with some individuals of Abies magnifica, Taxus brevifolia, Picea breweriana, and/or Chamaecyparis nootkatensis sometimes present. The shrub stratum averages 38% cover, but can be quite variable. Younger stands tend to be dense while mature stands have diffuse shrub layers only in major canopy openings. Mahonia nervosa (= var. nervosa) is present in all stands, but only attains an average of 3-5% cover. The herbaceous layer tends to be species rich, attaining its maximum cover in mature stands. Achlys triphylla has a mean cover value of 11%, while up to 16 other species of herb may also be present. These forests are very old - usually around 400 years of age. Mistletoe can be a problem with the Pseudotsuga menziesii, and the Chamaecyparis lawsoniana is gravely threatened by Phytophthora, an introduced root pathogen. The clear dominance of Achlys triphylla in the herb layer differentiates this association from other Chamaecyparis lawsoniana associations.  Accession Code: VB.CC.23012.ABIESCONCOLORCH Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Chamaecyparis lawsoniana Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: White Fir - Port Orford-cedar - Douglas-fir / (Dwarf Oregon-grape) / Sweet After Death Forest   UID: ELEMENT_GLOBAL.2.686608 NatureServe Explorer   Code: CEGL000041   Scientific: Abies concolor - Chamaecyparis lawsoniana - Pseudotsuga menziesii / (Mahonia nervosa) / Achlys triphylla Forest   Common: White Fir - Port Orford-cedar / (Oregon-grape)/ Vanillaleaf Forest (convergence) and Synonyms: (undetermined) Abies concolor - Chamaecyparis lawsoniana - Pseudotsuga menziesii / (Mahonia nervosa) / Achlys triphylla Forest