Circumpolar Arctic Vegetation Unit G4
- CAVM
- Vegetation
- About the Vegetation Map Units
- Bioclimate Subzones
- Floristic Provinces
- AVHRR
- Elevation
- Lake Cover
- Physiography
- NDVI and Phytomass
- Substrate Chemistry
- Coastline
- Literature
Barrens:
B1B1. Cryptogam, herb barren -
B2B2. Cryptogam barren complex (bedrock) -
B3B3. Noncarbonate mountain complex -
B4B4. Carbonate mountain complex ||
Graminoid Tundras:
G1G1. Rush/grass, forb, cryptogam tundra -
G2G2. Graminoid, prostrate dwarf-shrub, forb tundra -
G3G3. Non-tussock sedge, dwarf-shrub, moss tundra -
G4G4. Tussock-sedge, dwarf-shrub, moss tundra ||
Prostrate-shrub Tundras:
P1P1. Prostrate dwarf-shrub, herb tundra -
P2P2. Prostrate/hemiprostrate dwarf-shrub tundra ||
Erect-shrub Tundras:
S1S1. Erect dwarf-shrub tundra -
S2S2. Low-shrub tundra ||
Wetlands:
W1W1. Sedge/grass, moss wetland -
W2W2. Sedge, moss, dwarf-shrub wetland -
W3W3. Sedge, moss, low-shrub wetland
Hierarchy of Geobotanical Vegetation Map Units (Walker DA 2002)
G4. Tussock-sedge, dwarf-shrub, moss tundra
Moist tundra, dominated by tussock cottongrass (Eriophorum vaginatum) and dwarf shrubs <40 cm tall. Mosses are abundant. Subzone E, some Subzone D.
Detailed Description
Moist tussock tundra, mainly in Subzones D and E, on cold acidic soils. This is the zonal vegetation in Subzone E on unglaciated landscapes with ice-rich permafrost and shallow active layers, e.g., northern Alaska and Chukotka. Plant cover is nearly continuous (80-100%). The height of the plant canopy varies from about 20-40 cm. A less robust form of tussock tundra grows in Subzone D, with smaller tussock sedges and less abundant and shorter shrubs that do not overtop the tussocks.
Area: 336 x 1000 km2.
Representative Syntaxa
Sphagno-Eriophoretum vaginati Walk. et al. 1994 (Alaska); Carici arctisibiricae-Hylocomietum alaskani vicariant of Pinguicula villosa Matv. 1994 (Taimyr Peninsula) (cf. Ledo decumbentis-Betuletalia glandulosae Rivas-Martinez et al. 1999).
Dominant Plants
Tussock sedges with other sedges, and prostrate and erect dwarf-shrubs, and mosses. Other common plants include grasses, forbs, and lichens.
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- Tussock sedges: Eriophorum vaginatum; Carex lugens;
- Sedge: Carex bigelowii/arctisibirica/consimilis; Eriophorum triste;
- Prostrate and erect dwarf-shrubs: Ledum palustre spp. decumbens; Betula nana s.l.; Salix pulchra; Vaccinium vitis-idaea; Vaccinium uliginosum ssp. microphyllum; Arctous alpina; Rubus chamaemorus; Rubus arcticus; Cornus suecica;
- Moss: Sphagnum; Hylocomium splendens; Oncophorus wahlenbergii; Aulacomnium turgidum; Dicranum; Polytrichum;
- Grass: Arctagrostis latifolia;
- Forb: Pedicularis lapponica; Pedicularis labradorica; Bistorta plumosa; Polygonum tripterocarpum; Saxifraga nelsoniana; Nardosmia frigida;
- Lichen: Flavocetraria; Cladina rangiferina; Cladonia amaurocraea; Ochrolechia frigida; Alectoria nigricans; Bryocaulon divergens;
a=acidic, n=non-acidic