Circumpolar Arctic Vegetation Unit G1
- 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)
G1. Rush/grass, forb, cryptogam tundra
Moist tundra with moderate to complete cover of very low-growing plants. Mostly grasses, rushes, forbs, mosses, lichens, and liverworts. Subzone A and Subzone B.
Detailed Description
Moist tundra on fine-grained, often hummocky soils in subzones A and B. Plant cover is moderate (40-80%), and the vegetation forms a single layer generally 5-10 cm tall. This is the zonal vegetation in Subzone A, often occurring in somewhat more protected areas with moderate snow cover. Except for the greater density of plants, particularly rushes and grasses, it is similar in composition to cryptogam, cushion-forb barrens (Unit B1).
Area: 141 x 1000 km2.
Representative Syntaxa
Communities of the class Thlaspietea rotundifolii Br.-Bl. et al. 1947 (Saxifrago stellaris-Oxyrion digynae Gjaerev. 1950, e.g., Luzuletum arcuatae Nordh. 1928), and Salicetea herbaceae (Luzulion nivalis (Nordh. 1936) Gjaerev. 1956, e.g., Alopecuro alpini-Tomenthypnetum (Hadac 1946) Dierss. 1992 and Cerastio regelii-Poetum alpinae Dierss. 1992).
Dominant Plants
Grasses and rushes are usually the dominant vascular plants. Forbs are abundant. Mosses, lichens, and liverworts are common. Cryptogamic crusts composed of cyanobacteria and black crustose lichens are common. In Subzone B, prostrate dwarf shrubs and sedges are present but not dominant.
-
- Grass: Alopecurus alpinus; Dupontia fisheri; Deschampsia borealis/brevifolia; Poa abbreviata; Poa arctica;
- Rush: Luzula nivalisa; Luzula confusaa;
- Forb: Cardamine bellidifoliaa; Cerastium regeliin; Minuartia rossiin; Papaver dahlianum ssp. polare; Potentilla hyparcticaa; Saxifraga oppositifolian; Ranunculus hyperboreus; Draban; Stellarian; Oxyria digyna;
- Moss: Aulacomnium turgidum; Tomentypnum nitensn; Ditrichumn; Oncophorus wahlenbergii; Polytrichum; Racomitriuma; Schistidium;
- Lichen: Lecanora; Biatora; Pertusaria; Ochrolechia; Thamnolia; Cetrariella; Flavocetraria; Stereocaulonn;
- Liverwort: Liverworts;
- Cyanobacteria: Cyanobacteria;
- Black crustose lichens: Black crustose lichen;
- Prostrate dwarf shrubs: Dryasn; Salix polaris; Salix arctican;
- Sedge: Carex aquatilis; Eriophorum;
a=acidic, n=non-acidic