Dendrochronological Reconstruction of the Condition of Pripyshminsky Pine Forests around the Natural and Rehabilitation Complex “Gnezdo”

About the authors:

Stanislav P. Arefyev, Dr. Sci. (Biol.), Head of Sector of Biodiversity Dynamics and Natural Complexes, Institute of the Problems of Northern Development, Tyumen Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; Leading Researcher, the International Institute of Cryology and Cryosophy, University of Tyumen; sp_arefyev@mail.ru

Mariya N. Kazantseva, Cand. Sci. (Biol.), Associate Professor, Department of Ecology and Genetics, Institute of Biology, University of Tyumen; Leading Researcher, Institute of the Problems of Northern Development, Federal Research Center, Tyumen Scientific Center of the Siberian Branch of the Russian Academy of Sciences; mnkazantseva@yandex.ru

Abstract:

This article features dendrochronological reconstruction of the course of growth, physiological, and structural (mechanical) stability of Pinus silvestris and Betula pendula, on two sites: 1) an anthropogenically transformed coastal site (1967-2016) and 2) a conditionally natural state forest site (1945-2016). The authors have established that the senior generation of the pine on the coastal site was formed after the mass damage of the woods by the fires and insects, which happened near Tyumen in arid 1860s. During the subsequent time, the forest stand with their participation was exposed to permanent selective cabins for needs of residents of neighboring villages, and since 1960s — while arranging the territory of a summer camp. Cabins of the period of World War I, a consequence of an abnormal flood of 1968 are noted. The pathological depression of arid 1930s, the consequences of which make it similar to the total loss of the forests in the 1860s.

Thus, the modern forest area on site 2 was formed on the forest stand, which died on the spot, by the end of the 1930s, but not because of cuttings during the Great Patriotic War. Since the 1940s to the present, on the forest site, one may observe the trend for reduction of physiological and mechanical stability of the pine and birch. That relates, mostly, to increasingly drier climate: periodic damage of a forest stand by the local fires is noted; in arid 2012, the part of a forest stand was struck by insects and was lost. On the coastal site, owing to the long adaptation of the pine to the anthropogenous breaking factors, the trend for reduction of its stability during its growth has not been noted.

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