Mountain-Taiga research station maintains an ecological profile, which represents the main forest types of the region: five broad-leaved forest types on the northern slope and four Mongolian oak dominated forest types on the southern slope. Every forest type represented by a permanent sample plot (PSP) established in 1997 and have been remeasured over recent years. The study of structural and functional organization of ecosystem (incl. the study of the vegetation structure, restoration processes, phenological observations, etc.) is carried out in accordance with the generally accepted methodology. PSPs have size from 0.25 ha (50x50 m) to 0.42 ha (60x70 m). The size was determined by the complexity of the parcel structure. Each PSP has been mapped with a detailed description of all vegetation layers. The PSPs were preliminarily divided into sub-plots of 10x10 m, and all work was carried out with reference to the sub-plots. Each tree got ID, species identification, diameter measurements and health status identification.