VITALITY AND AGE STRUCTURE OF CОENOPOPULATIONS OF (<i>BECKMANNIA SYZIGACHNE</i> (STEUD.) FERN) AND (<i>CALAMAGROSTIS LANGSDORFII</i> (LINK) TRIN) UNDER CONDITION OF THE LENA-VILUY INTERFLUVE
The article presents the data on vitality and age structure of Beckmannia syzigachne and Calamagrostis langsdorffii соеnopopulations under conditions of the Lena-Viluy interfluve. The study revealed 3 types of vitality of Beckmannia syzigachne (prosperous, equilibrium, and depressive), 2 types of vitality of Calamagrostis langsdorffii (prosperous and depressive). The age spectrum in both species is normal, non-complete, left-sided. According to the delta-omega classification, the coenopopulations are considered to be young