BLM REA CYR 2013 Current Distribution of Alpine Dwarf Shrub Tundra

Metadata Updated: November 12, 2020

Some of the CYR rasters intentionally do not align or have the same extent. These rasters were not snapped to a common raster per the authors' discretion. Please review selected rasters prior to use. These varying alignments are a result of the use of differing source data sets and all products derived from them. We recommend that users snap or align rasters as best suits their own projects. - The Alpine Dwarf Shrub Tundra CE is widespread above treeline on ridges, summits, side slopes, late-lying snow beds, and high elevation valleys throughout the boreal, sub-boreal, and low arctic regions of Alaska. Dwarf and prostrate shrubs less than 20 cm tall are the dominant canopy layer with at least 25% cover. In mountainous regions, dwarf shrub tundra typically represents the highest elevation zone of continuous vegetation. On protected sites, vegetation cover is continuous; on exposed or steep sites canopy cover is sparse due to wind desiccation and slope instability. High elevation valley bottoms and northerly side slopes are typically moist and may retain late-lying snow, while summits and ridges are wind scoured and well-drained. Soils are typically thin, stony, and well drained to excessively well-drained. Permafrost may be present, but sites are generally thaw-stable owing to the shallow, rocky soils. Both plant community and species diversity are high in alpine dwarf-shrub tundra. Composition may be dominated by dwarf evergreen or deciduous shrubs, often in combination with grasses, sedges, and lichens. Common dwarf and prostrate shrubs include Dryas ajanensis ssp. beringensis, Vaccinium uliginosum, V. vitis-idaea, Kalmia procumbens, Diapensia lapponica, Rhododendron tomentosum, Empetrum nigrum, Cassiope tetragona, Betula nana, Salix arctica, S. phlebophylla, S. reticulata, S. rotundifolia, Arctous rubra, and A. alpina. Common grasses and sedges include Anthoxanthum monticola ssp. alpina, Festuca altaica, Luzula spp., Carex bigelowii ssp. lugens, C. microchaeta, C. scirpoidea, and C. nardina. Forb cover is usually low, but diversity can be high including species such as Antennaria spp., Arnica lessingii, Boykinia richardsonii, Geum glaciale, G. rossii, Minuartia arctica, Oxytropis nigrescens, Pedicularis lanata, Bistorta plumosa, Saxifraga bronchialis, S. oppositifolia, S. tricuspidata, and Senecio lugens. Common mosses include Hylocomium splendens, Racomitrium lanuginosum, Rhytidium rugosum, Dicranum spp. and Polytrichum spp. On dry exposed sites lichens, including Cladina rangiferina, C. stellaris, Flavocetraria cucullata, F. nivalis, Stereocaulon spp., Alectoria spp., and Thamnolia vermicularis, may be abundant. Ericaceous sites dominated by Cassiope tetragona are often associated with late lying snow and protected microtopgraphy in mountainous terrain, while Dryas ajanensis ssp. beringensis sites are more common on drier, more exposed microsites often with southerly exposures. Alpine dwarf shrub tundra was derived from the dwarf shrub and dwarf shrub lichen classes of the Vegetation Map of Northern, Western, and Interior Alaska extracted to non-floodplain areas of the study area not covered by forested classes in the National Land Cover Database. Alpine dwarf shrub tundra is a current distribution dataset.

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Dates

Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Responsible Party Alaska Center for Conservation Science, University of Alaska Anchorage (Point of Contact)
Contact Email
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Bbox East Long -137.454587
Bbox North Lat 69.369222
Bbox South Lat 61.998256
Bbox West Long -164.582207
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Frequency Of Update notPlanned
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Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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