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Abies lowiana - Chamaecyparis lawsoniana / Quercus sadleriana / Leucothoe davisiae - Rhododendron macrophyllum Forest | NatureServe Biotics 2019
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Name: Abies lowiana - Chamaecyparis lawsoniana / Quercus sadleriana / Leucothoe davisiae - Rhododendron macrophyllum Forest Reference: NatureServe Biotics 2019 Description: This giant coniferous forest association occurs in narrow draws and streamsides in southwestern Oregon and possibly northern California at an average elevation of 1000 m. All known stands are within the Silver Creek drainage, southwest of Galice, Oregon. This is one of the rare locations where <i>Tsuga heterophylla</i> occurs inland from the Coast Ranges with <i>Abies lowiana</i> also present. The geology within the range of this forest type is very complex. Most stands of this association seem to grow upon coarse grained, colluvium, or colluvium mixed with alluvium derived from granitic to gabbroic rocks, sometimes mixed with ultramafics. The soils are shallow with an average depth to the C horizon of 43 cm. This is a fairly dense forest community, with tree canopy cover averaging 86%. The tree canopy is codominated by <i>Chamaecyparis lawsoniana, Tsuga heterophylla</i>, and <i>Abies lowiana</i>, often with a significant component of <i>Pseudotsuga menziesii</i>. This association often contains a significant amount of <i>Thuja plicata, Chrysolepis chrysophylla, Pseudotsuga menziesii</i>, and/or <i>Alnus rubra</i>. The shrub stratum averages 50% cover. Shrubs are either diffuse and continuous over large areas, or confined to canopy openings in younger stands with very dense trees. <i>Leucothoe davisiae</i> attains the highest cover of any shrub in the community, and is usually found as low streamside mats. Taller individuals of <i>Vaccinium parvifolium</i> and <i>Quercus sadleriana</i> are scattered away from the stream, and share the tall-shrub layer with immature conifers, the hardwood <i>Notholithocarpus densiflorus</i> and <i>Rhododendron macrophyllum</i>. The herbaceous layer attains only 16% cover, and no herb dominates. The presence of <i>Tsuga heterophylla</i> and <i>Abies lowiana</i> in the tree canopy differentiate this association from other <i>Chamaecyparis lawsoniana</i> associations.  Accession Code: urn:lsid:vegbank.org:commConcept:28951-{87142E50-EC9C-4B71-8E2D-2015CDC991B1} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 06-Dec-1993 to: ongoing
	status: accepted Community's Parent: Chamaecyparis lawsoniana - Picea sitchensis Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.686330 NatureServe Explorer   Code: CEGL000042   Translated: Sierra White Fir - Port Orford-cedar / Deer Oak / Sierra Laurel - Pacific Rhododendron Forest   Scientific: Abies lowiana - Chamaecyparis lawsoniana / Quercus sadleriana / Leucothoe davisiae - Rhododendron macrophyllum Forest (convergence) and Synonyms: (similar) Abies concolor - Chamaecyparis lawsoniana / Quercus sadleriana / Leucothoe davisiae - Rhododendron macrophyllum Forest (similar) CEGL000042 (similar) Abies concolor - Chamaecyparis lawsoniana / Quercus sadleriana / Leucothoe davisiae - Rhododendron macrophyllum Forest