Flora and Vegetation of the Alazeya River Valley (Northern Yakutia)

 

Zakharova V.I.

 

Studies of the flora and vegetation of the Alazeya River valley in the middle and lower reaches were conducted. The route studies were made using the generally accepted floristic and geobotanical methods. 239 species of vascular plants from 106 genera and 42 families were revealed on this part of the river. The leading families are Poaceae, Cyperaceae, Brassicaeae, Ranunculaceae, Salicaceae, Rosaceae, Caryophyllaceae, Scrophulariaceae, accounting for 63.4% of the total number of the revealed flora.  8.9% of the plants are common for northern taiga and near-tundra subzones, whereas 14.5% of species are grown in the tundra zone, and are common with near-tundra light forests. 23% of the plants are widespread. According to the geobotanical zoning of Yakutia the middle and lower reaches of the Alazeya River cover 3 districts, 3 subprovinces, 6 subzones, and 2 zones. Each zone and subzone features its specific vegetation. Prolonged floodingscause a huge loss to natural complexes and agriculture. It results in decrease of the areas occupied by forests, hayfields and pastures. The fodder resources for waterfowl birds and wild animals are reduced as well.

Key words: middle and lower reaches, Alazeya River, flora, vascular plants, vegetation, northern taiga and near-tundra subzones, tundra zone, NorthenYakutia.

Science and Education, 2015, No.2, pp.125-129