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Pseudotsuga menziesii - Abies lowiana - Calocedrus decurrens Forest | NatureServe Biotics 2019
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Name: Pseudotsuga menziesii - Abies lowiana - Calocedrus decurrens Forest Reference: NatureServe Biotics 2019 Description: This association occurs throughout the northern Sierra Nevada and southern Cascades of California at least as far south as Yosemite Valley. Stands of this forest are found at low elevations (640-1460 m [2100-4800 feet]) at cool, moist sites with humid air. These sites tend to occur on north- or northeast-facing, gentle to moderately steep (12-80%), lower or mid slopes. Sites are often adjacent to perennial streams generally occupying small areas. Soils are moderately deep to deep in metamorphic or volcanic substrates. Coarse fragments tend to be higher in this association. Fire is infrequent, with low to medium intensities and variable spread. Stands of this forest form a dense, multi-layered overstory of <i>Pseudotsuga menziesii, Abies lowiana</i>, and <i>Calocedrus decurrens</i>. <i>Corylus cornuta</i> is in the shrub layer, and dense patches of both or either <i>Adenocaulon bicolor</i> or <i>Trichostema lanceolatum</i> are in the herb layer. <i>Pseudotsuga menziesii</i> dominates and occasionally codominates with <i>Abies lowiana</i>. <i>Calocedrus decurrens, Pinus lambertiana</i>, and occasionally <i>Pinus ponderosa</i> are minor associates. Infrequently, <i>Taxus brevifolia</i> and <i>Torreya californica</i> are present. <i>Pseudotsuga menziesii</i> dominate the regeneration, but <i>Abies lowiana</i> and <i>Calocedrus decurrens</i> can also be high or dominant. <i>Quercus kelloggii, Pinus lambertiana</i>, and <i>Cornus nuttallii</i> are common in low amounts. <i>Quercus chrysolepis</i> occurs in the overstory and midstory on sites with limiting soil conditions, either shallow and stony sites with limited rootability or very high coarse fragments. <i>Corylus cornuta</i> forms a tall-shrub layer of variable cover. The herb layer is well-developed with dense patches dominated by <i>Adenocaulon bicolor</i> and <i>Trichostema lanceolatum</i>.  Accession Code: urn:lsid:vegbank.org:commConcept:34469-{AEE1D610-363A-4723-AB40-532587D132C8} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 06-May-2010 to: ongoing
	status: accepted Community's Parent: Pinus ponderosa - Calocedrus decurrens - Pseudotsuga menziesii Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.685253 NatureServe Explorer   Code: CEGL005813   Translated: Douglas-fir - Sierra White Fir - Incense-cedar Forest   Scientific: Pseudotsuga menziesii - Abies lowiana - Calocedrus decurrens Forest (convergence) and Synonyms: (similar) Pseudotsuga menziesii - Abies concolor - Calocedrus decurrens Forest (similar) Pseudotsuga menziesii - Abies concolor - Calocedrus decurrens Forest