Spectral analysis of tree-ring chronologies of unique trees in the north of West Siberia

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

Vladimir R. Tsibulsky, Dr. Sci. (Tech.), Professor, Chief Researcher, Institute of Problems of Development of the North, Tyumen Scientific Center of the Siberian Branch of the Russian Academy of Sciences; v-tsib@yandex.ru

Abstract:

The study analyzes tree-ring chronologies of the oldest trees (450-500 years) of Larix sibirica and Pinus sibirica fr om the northern distribution lim it of West Siberia (Yamal-Nenets Autonomous Area). The authors use the method of spectral estimation (Multiple Signal Classification) with assessment of age component from initial chronologies. Cycles of 80-100, 18-22, and 8-12 years are revealed. The cycle of 4.5-5.5 years, obviously, is connected with seed efficiency of trees. The last 20-30 year period is characterized by increase in radial tree increment that is linked with global warming in the region. To determine the stability of tree growth, chronologies’ stationarity is assessed by the criterion of series with 20 blocks (approximately 20 years) before and after age trend calculation. When increment stationarity of separate trees, the authors assess the stability of local wood types at a first approximation. The chronologies’ stationarity from undisturbed habitats and chronologies’ non-stationarity from neighboring settlements (Nadym, Samburg) are determined. Obviously, they are linked with anthropogenous transformation of cenosis and formation of local climate.

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