The dynamics in mixed birch-alder forest (Prioksko-Terrasny biosphere reserve)

Natural dynamics in mixed birch-alder forest and alteration in its structure because of beaver dam were investigated. There was no significant changes during 18 years (1991-2008). In the year of 2009 the most part of our permanent plot was flooded. The number of trees and saplings died and the total species richness reduced. Next year the high-nutrient site appeared due to relocation of the dam. It was occupied by some hygrophyte species. In the third year of the flooding some hydrophytic plants sprang up in the pond.