Possible pathways for the formation of flora and macromycetes of floodplain forests of the Ural River within Western Kazakhstan

Abstract

The article deals with the historical reconstruction of flora and macromycetes of the floodplain forests of the Ural River. The length of the entire river is 2428 km, over 1000 km in Western Kazakhstan. Floodplain forests are developed in three genetic parts: riverbed, central and near-terrace. Primary and derivative forests are distinguished according to the forest structure. The leading factor in the formation of the Ural River valley is geology and relief, in connection with which 4 natural regions have been identified for their floristic (630 plant species) and mycological diversity (77 macromycetes species). The course of evolution and transformation of the floromycological composition of forest communities is analyzed according to the composition of historical formations. In the studied region, 13 suites were identified in the understanding of G.M. Zozulin, among them, 6 suites that stand out well in modern floodplain forests are considered in more detail. When establishing the formations, the character of the modern distribution of species, there was considered their cenotic confinement, genetic relationships of individual species, the rhythm of development, and the vitality of species in the community. The process of the formation of the floromycological complex of floodplain forests is based on relict and migratory elements, enriched, and settled from the Southern Urals, as well as from the valley of the left tributaries of the Volga and Common Syrt. The formation of which took a long time from the Miocene to the Holocene.