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Tsuga heterophylla - Pseudotsuga menziesii Serpentine Soil Forest Alliance | NatureServe Biotics 2019
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Name: Tsuga heterophylla - Pseudotsuga menziesii Serpentine Soil Forest Alliance
Reference: NatureServe Biotics 2019
Description: This coniferous forest alliance consists of forested stands dominated by a mix of <i>Pseudotsuga menziesii</i> and <i>Tsuga heterophylla</i> on pockets of serpentine or ultramafic soils. Understory plants are tolerant of and endemic to serpentine soils. They occurs at low elevations (0-1500 m) within the maritime-influenced region of the Pacific Northwest. Stands occur on the lower slopes of the Coast Ranges that feature high precipitation, long frost-free periods, and low fire frequencies. Much of the annual precipitation occurs as rain. Where snow does occur, it can generally be melted by rain during warm winter storms. In all settings, this alliance occurs where environmental conditions are moderated by the marine influence, with moderate drought and frost. Not many associations have been described, and the overstory conifer species are not particularly tolerant of serpentine soils; however, serpentine and ultramafic soils are common in the Siskiyou and Klamath mountains where there are patches of these soils within the range of these forest types. 
Accession Code: urn:lsid:vegbank.org:commConcept:38663-{293B0417-D761-4E4A-9AA7-28E2305F785F}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Sep-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899500 NatureServe ExplorerNatureServe Explorer logo
  Code: A3376
  Translated: Western Hemlock - Douglas-fir Serpentine Soil Forest Alliance
  Common: Western Hemlock - Douglas-fir Serpentine Soil Forest
  Scientific: Tsuga heterophylla - Pseudotsuga menziesii Serpentine Soil Forest Alliance