RUSSIAN JOURNAL OF FOREST SCIENCE, 2020, No. 5, P. 387–398


SPATIO-TEMPORAL STRUCTURE AND DYNAMICS OF A LATE SUCCESSION STAGE CEDAR PINE TAIGA OF THE WESTERN SAYAN MOUNTAINS
D. M. Danilina, D. I. Nazimova, M. Ye. Konovalova
Forest Institute, Siberian Branch of the RAS
Akademgorodok 50 bldg. 28, Krasnoyarsk, 660036, Russia
E-mail: dismailova@mail.ru


Received 29 January 2018
The paper presents the results of the stationary studies (since 1965 to 2017) of the regularities within the dynamics of the spatial structure of the old-growth cedar pine taiga on the example of the natural growth cedar pine sedge-tall-grass-fern taiga on the late succession stage (Western Sayan, 53º01´ N., 92º59´ E., individual test site area 1.56 ha). It was found that for a period of 50 years a dynamic balance is being maintained in the edificator layer’s structure, while the sub-edificator layer (mainly fir) undergoes more rapid changes in age structure and affects the relations between the lower layers synusiae as well as their role in the cedar pine (Pinus sibirica (Du Tour) and Siberian fir (Abies sibirica (Ledeb.) regrowth. Each synusia is characterised by a relatively constant number of species, dominant species structure and eco-coenotic groups ratio. Tall-grass-fern, calamagrostis-dryopteris, aconite-sedge, sedge and oxalis synusiae of different complexity remain the constant structural elements of the forest of this type. Individual grass layer synusiae’ roles in cedar pine regrowth have been determined in tall-grass-fern group of forest types. In the dominating tall-grass-fern synusia the cedar pine regrowth process is slow and occurs mostly on microelevations, in the windfall and fallen tree sites. In the sedge synusia, on the contrary, a competition with the grass is lower and periodical outbreaks of cedar pine regrowth occur during the high productivity years; however the probability of seedlings’ further survival is low due to a competition with the parent trees. The results obtained allow to predict the age dynamics of a natural growth cedar pine taiga for the next several decades, considering the climate and weather trends being typical for the latter century cycle without any catastrophic changes. The microtypes and synusiae variation supports the sustainability of the whole mountain ecosystem and will play an important role in modelling the regrowth and spatial distribution of individual trees during the later stages of fir-cedar pine forests development in the taiga zone of the Sayan mountains.
Key words: alpine-taiga late succession stage fir-cedar pine (Pinus sibirica+ Abies sibirica) forest, long-term monitoring, mapping, structural variations, synusiae, regrowth, microbiotopes, ecosystems’ sustainability factors.
Acknowledgement: This study was held within the framework of the State Contract of the FRS KSC RAS (0356-2019-0024), and with the financial support from the RFBR (18-05-00781А).
DOI: 10.31857/S0024114820050034


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