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Vegetation Differentiation Across a Topographic YedomaAlas Transect in the High Arctic Tundra of Oyogos Yar, East Siberia

Excessive moisture is regarded as the main cause for the fall of Pleistocene tundra-steppe and the rise of modern tundra. The arctic tundra of Oyogos Yar is low in diverse plant species (ca 100). The floral composition is mainly the result of differences in moisture or drainage, respectively. We describe a vegetational profile recorded in August 2007 along a 10 km transect from the top of a yedoma ridge down to the adjacent alas depression between 40 m to 10 m a.s.l. Six main landscape units are described with respect to their floristic composition: yedoma top with thermokarst mounds, mud boils, yedoma slopes, small thermokarst ponds, thermo-erosional valleys, and the bottom of thermokarst depressions. Arctic thermokarst landscapes with yedoma ridges and alas depressions can be well-classified according to their vegetation. The main constituents of the plant cover at well-drained sites are grasses and polar willows, whereas excessively wet sites are occupied by sedges, cotton grass, and peat moss.