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Abies concolor - Pseudotsuga menziesii / Acer glabrum Forest | NatureServe Biotics 2019
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Name: Abies concolor - Pseudotsuga menziesii / Acer glabrum Forest Reference: NatureServe Biotics 2019 Description: This white fir forest association ranges from southern and central Utah and southern Colorado to northern New Mexico and central Arizona and is found between 2073 and 3140 m (6800-10,300 feet) elevation. This forest shows great variety with respect to topographic characteristics. In southern Colorado and northern New Mexico, it is one of the most widespread mixed conifer forests. Though it frequently occurs on moderate to steep north- and northwest-facing slopes, other slope aspects are represented. When found on southern aspects, this forest is at higher elevations or streamside settings. Predominantly found on lower slopes, it has also been located on mid- and upper slopes. Sites can have high amounts of exposed rock (up to 50% or more cover), with abundant leaf litter and coarse woody debris. The overstory is highly complex and has high variability. <i>Abies concolor</i> dominates or codominates, if not in the overstory, then as regeneration. <i>Pseudotsuga menziesii</i> is a successional dominant and remains a codominant in late-successional stands, becoming minor in very old stands. <i>Picea pungens</i> and <i>Pinus flexilis</i> may be important, as well as <i>Pinus strobiformis</i> at lower latitudes. <i>Abies lasiocarpa</i> and <i>Picea engelmannii</i> may occur in frost pockets as regeneration or occasional mature trees, but they are minor and almost always are under severe competition from dense regeneration and canopy dominance of <i>Abies concolor</i> and <i>Pseudotsuga menziesii</i>. The open to dense tall-shrub layer dominates the undergrowth with <i>Acer glabrum</i> and often <i>Amelanchier alnifolia</i>. If present, <i>Quercus gambelii</i> has low cover (&lt;5%). Common low-growing shrubs are <i>Holodiscus dumosus</i>, and <i>Jamesia americana</i>, which occur on cobbly substrates, along with <i>Mahonia repens, Paxistima myrsinites, Physocarpus monogynus</i>, and <i>Symphoricarpos oreophilus</i>; however, some stands have an open shrub of layer of <i>Acer glabrum</i> and little else in the understory. The herb layer species are typically low in cover value.  Accession Code: urn:lsid:vegbank.org:commConcept:29149-{28BE9AAB-3E3F-4BB8-86C4-B714791EA57D} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Dec-2018 to: ongoing
	status: accepted Community's Parent: Abies concolor Southern Rocky Mountain Mesic Forest & Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688228 NatureServe Explorer   Code: CEGL000240   Translated: White Fir - Douglas-fir / Rocky Mountain Maple Forest   Scientific: Abies concolor - Pseudotsuga menziesii / Acer glabrum Forest (convergence) and Synonyms: (similar) Abies concolor - Pseudotsuga menziesii / Acer glabrum Forest (similar) CEGL000240 (similar) Abies concolor - Pseudotsuga menziesii / Acer glabrum Forest