About vegetation structure of birch forest-steppe of Eravna basin (southern Vitim plateau)

The article is devoted to study of the phytocoenotic diversity and vegetation structure of cryoarid birch forest-steppe of Eravna depression which is located in the southern part of Vitim plateau. The classification of communities was conducted according to dominant-determinant approach. Within birch forest formation the following associations have been determined: varia herbosa+Fragaria orientalis-Larix gmelinii+Betula pendula, varia herbosa+Fragaria orientalis-Rosa acicularis-Larix gmelinii+Betula pendula, varia herbosa+Fragaria orientalis-Pentaphylloides fruticosa-Larix gmelinii+Betula pendula, Poa botryoides+Leymus chinensis+varia herbosa-Betula pendula, Equisetum pratense-Betula pendula, varia herbosa+Stellera chamajasme-Betula pendula. The article contains the short description of associations and the structure of vegetation of birch grove forests is considered.