Potential composition of arboreous species in the ridge type of landscape on the example of the protected territory of the PetrSU Botanic Garden

In this work a new approach is used, based on the concept of the mosaic-cyclical organization of the forest vegetation and on the comparison of vegetation units chosen by different indications. The method is used for the investigation of taiga forests for the first time. The structure of the Botanic Garden's protected territory is typical for ridge landscape. The comparative analysis of its ecotops is given relatively to its main ecologic parameters, a functional landscape unit is revealed - a cathena of the second order. The restrictive factors in the formation of full-term populations of arborous species are defined. On the basis of the got data the fact is elicited that 5-6 main forest-forming species of arborous plants can in potential make part of the arborous layer in the ridge landscape ecotops under investigation. They determined a limited number of variants restricted by the cathena ecotops. The main ecological factors determining the potential structure of the arborous layer are on the first part the dampness, microclimatic conditions and the richness of soils. The quantitative correlation of species is stipulated by intracenotic interaction.