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Abies grandis / Mahonia nervosa Forest | Western Ecology Working Group of...
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Name: Abies grandis / Mahonia nervosa Forest Reference: Western Ecology Working Group of... Description: This forest association occurs in the eastern Cascades of Washington between Lake Chelan and Mount Adams on all aspects between 760-1100 m (2500-3600 feet) elevation. Two locally described associations, <i>Abies grandis / Berberis nervosa</i> and <i>Abies grandis / Berberis nervosa / Calamagrostis rubescens</i>, are included in this type. The former appears on midslopes on deeper soils with more volcanic ash and with more maritime climates than the latter, which is typically found on upper slopes. <i>Pseudotsuga menziesii</i> codominates the forest canopy with <i>Abies grandis</i>. <i>Larix occidentalis, Pinus ponderosa</i> or <i>Pinus contorta</i> can be members of the upper canopy. <i>Abies grandis</i> dominates the regeneration layers. A short-shrub layer (less than 1 m) with scattered forbs and graminoids typify the understory. The evergreen shrub <i>Mahonia nervosa (= var. nervosa)</i> is found in all examples and usually the most abundant of several shrubs. <i>Symphoricarpos mollis, Rosa gymnocarpa, Linnaea borealis</i>, and <i>Paxistima myrsinites</i> are the most commonly associated shrubs. The graminoids <i>Calamagrostis rubescens</i> and <i>Carex geyeri</i> are the most abundant and frequent herbaceous species, although a few of several possible broad-leaved forb species are always present. Sampled stands are between 75 and 125 years old; the oldest stands are around 200 years old. This association includes <i>Abies grandis</i> forest with <i>Mahonia nervosa</i> well-represented in the understory without a dominant tall-shrub component (<i>Acer circinatum</i> primarily), and/or with an herbaceous layer that is not dominated by <i>Achlys triphylla</i>. This association is found on better drained uplands sites than sites with abundant <i>Achlys triphylla</i>. <i>Spiraea betulifolia var. lucida, Calamagrostis rubescens</i>, and <i>Festuca occidentalis</i> are more common in this association than on sites with abundant <i>Achlys triphylla</i>.  Accession Code: VB.CC.34698.CEGL000271 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Nov-2014 to: 01-May-2019
	status: accepted This Community's Level: association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.683996 NatureServe Explorer   Translated: Grand Fir / Cascade Barberry Forest   Scientific: Abies grandis / Mahonia nervosa Forest   Code: CEGL000271