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AbstractThe results of stationary studies 1965 2017 on the regularities of the dynamics of the spatial structure of old-growth cedar-pine forests are shown on the example of a natural-growth cedar-pine sedge tall herb fern forest of the late succession stage Western Sayan 53 01 N 92 59 E individual test site area of 1 56 ha It was found that a dynamic balance has been maintained in the structure of the edificator layer for a period of 50 years while the subedificator layer fir has undergone more rapid changes in age structure and affects the relations between the synusiae of lower layer and their role in the regrowth of cedar pine Pinus sibirica Du Tour and Siberian fir Abies sibirica Ledeb Each synusia is characterised by a relatively constant number of species dominant-species structure and ratio of ecocoenotic groups Tall herb fern calamagrostis dryopteris aconite sedge sedge and oxalis synusiae of different complexities remain the constant structural elements of this type of forest The roles of the individual herbaceous synusia in cedar pine regrowth have been shown for the tall grass fern group of forest types Cedar-pine regrowth is slow in the dominant tall grass fern synusia and occurs mostly on microrelief at sites of windfall and fallen trees Conversely the competition with the grass is lower in the sedge synusia and periodical outbreaks of cedar-pine regrowth occur in years of high productivity However the probability of seedlings further survival is low due to competition with the parent trees The results allow the prediction of the age dynamics of a natural-growth cedar pine forest for the next several decades under the assumption of climate and weather trends that are typical for the latter century cycle and are without any catastrophic changes The diversity of microtypes and synusiae supports the sustainability of the entire mountain ecosystem and will play an important role in the modeling of the regrowth and spatial distribution of individual trees during the later stages of fir cedar pine forest development in the taiga zone of the Sayan mountains

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Spatiotemporal Structure and Dynamics of the Late Succession Stage of Taiga Cedar Pine of the Western Sayan Mountains

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with taiga late-succession fir–cedar pine (Pinus sibirica + Abiessibirica) forest as keyword