Abstract
The article provides an analysis of their sinusial structure, the species composition of vascular plants of the Ural River floodplain within the steppe zone is studied in detail. For the first time, a classification has been carried out for the study area and a phytocenological characteristic of all tree-shrub vegetation has been compiled; patterns of ecological-dynamic changes in the types of floodplain forests are revealed. It has been established that the Tilia cordata and Quercus robur formations are quite rare for the territory of the Orenburg region. The growth class of oak forests is assessed in grades II – IV, and linden forests in grades III. Two groups of types of oak forests are characteristic of the floodplain of the study area: blackberry oak and lily of the valley oak. Linden associations are represented by two-tier plantations. Tilia cordata dominates in the first tier, Ulmus laevis and Quercus robur form the second tier. A decrease in the floodplain area under Quercus robur and Tilia cordata on the territory of the Ilek and Tashlinsky forestries was noted. Phytocenoses are transformed by replacing Quercus robur formations with Ulmus laevis formations.
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