Aquatic and hygrophytic vegetation of the Lower Volga valley
Golub, V. B.; Losev, G. A.; Mirkin, B. M.
The Lower Volga valley is taken by the authors to signify the portion extending downstream of the Volgogradskaya power station dam. The Lower Volga valley can be divided into two large geomorphological parts: flood-lands and delta. The latter can be additionally subdivided into the abovewater, transitional and underwater parts. The impoundmends (artificial reservoirs) of the Lower Volga valley have been found to vary in their current velocities, water-levels, and salinization rates. Aquatic and hygrophytic (off-shore) vegetation of this region has been studied, using the Braun-Blanquet principles. This vegetation is represented in this paper by 6 classes including 52 associations and 3 communities. Many associations have been subdivided into subassociations and variants. Two alliances and twelve associations were previously unknown. Diagnostic tables for the conventional syntaxa, as well as the data for the novel ones are presented here. Ecological interpretation of the syntaxa is based on the environmental data. The syntaxa described are compared to their equivalents from different parts of Western Europe.