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Chamaecyparis lawsoniana Temporarily Flooded Forest Alliance | Western Ecology Working Group of...
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Name: Chamaecyparis lawsoniana Temporarily Flooded Forest Alliance Reference: Western Ecology Working Group of... Description: This alliance has only been described from a very restricted range in the Klamath/Siskiyou mountain region of northern California and southern Oregon between 635 and 1430 m in elevation. Most of this area is strongly influenced by maritime air and lies at the northern cusp of the Mediterranean climate region of the Pacific Coast. Winters are cool and wet; summers are warm and dry. Annual precipitation ranges from 100-225 cm, with only 2-4% falling between June and August. This alliance occurs on moist terraces, in ravines, and along streams in the drier, more inland areas, and on deeper gentle slopes closer to the ocean. These communities occur on three major parent material types: diorite, gabbro, and serpentine. This is a dense, often giant coniferous forest dominated by Chamaecyparis lawsoniana (42%) and Pseudotsuga menziesii (24%). Lithocarpus densiflorus, Pinus lambertiana, and Pinus jeffreyi can also be present. Abies concolor is occasionally present in Oregon stands, and can be up to 10% of the canopy in some California stands. The understory is characterized by dense cover of Rhododendron occidentale, with an average cover of 24%. Gaultheria shallon, Morella californica (= Myrica californica), Quercus vacciniifolia, Vaccinium virgatum (= Vaccinium parviflorum), and Rubus ursinus can be present. Forbs and graminoids include Carex spp., Xerophyllum tenax, and Goodyera oblongifolia. The forests are often very old, with stands (with and without Abies) in California ranging from 300-575 years. Adjacent upland vegetation is varied, from Picea sitchensis / Abies grandis / Tsuga heterophylla forests near the coast, to Abies concolor / Abies magnifica / Calocedrus decurrens forest in high-elevation interior stands, to Pinus jeffreyi / Pinus monticola forests on serpentine soils.  Accession Code: VB.CC.27875.CHAMAECYPARISLA Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: Chamaecyparis lawsoniana Temporarily Flooded Forest Alliance   Translated: Port Orford-cedar Temporarily Flooded Forest Alliance   UID: HIGHER_CLASS_UNIT.2.126592 NatureServe Explorer   Code: A.173