Phytocenotic peculiarities of plant communities of the forest type dubnyak boromyatlikovy and stability of tree stands in them under the conditions of the south of the Volga upland

Abstract

The article presents the results of field studies of indigenous and derived communities, similar in terms of the ecological space occupied by the regimes of salt richness of soils (Tr) and moisture (Hd) with the type of forest oak forest, boromum. Background species of forest stands are Quercus robur L., Tilia cordata Mill., Betula pendula Roth., Populus tremula L., Acer platanoides L.; undergrowth – Euonymus verrucosa Scop., Sorbus aucuparia L.; ground cover – Convallaria majalis L., Poa nemoralis L., Galium odoratum (L.) Scop. The ecological-coenotic spectra of plants of indigenous communities differ from derivatives in a smaller proportion of nemoral (Nm) species, somewhat larger in meadow-steppe (dry (MDr) and wet-meadow (MFr), as well as steppe (St) species). The oak part of the forest stands can be considered stable based on the H/G, S2 criteria and the dynamics of taxation characteristics, while the cenopopulation of Q. robur L. due to the same age of the trees and the absence of a constant generation turnover is unstable and degrading.