Issue №4, Vol. 13
Grippa S., Potakhin S. Periodicity of warmth and humidity correlation in taiga geocomplexes of the European North of Russia, according to dendrochronological data // Resources and Technology. 2016. №4, Vol. 13. P. 27‒44.



DOI: 10.15393/j2.art.2016.3501

Periodicity of warmth and humidity correlation in taiga geocomplexes of the European North of Russia, according to dendrochronological data

Grippa
   Sergei P.		Petrozavodsk State University, sgrippa@rkmail.ru
Potakhin
   Sergey B.		Petrozavodsk State University, spotakhin@yandex.ru
Key words:
taiga geocomplexes
dendrochronology
rhythmicity and periodicity
spectral analysis
European North of Russia		 Summary: The article observes the analysis of the dendrochronological research data relating to taiga geocomplexes of the European North of Russia. Rated indexes of the tree-ring series (annual growth gain of coniferous tree rings) are being cross-referenced with the climatic data from the weather stations of the explored region, with the average atmospheric temperatures and precipitation rates of various periods. Statistical analysis of the compared data has been conducted: cross-correlational, autocorrelational, spectral. Also, we have figured out the rhythmicity of tree rings growth gain fluctuation during the period of time equal to the age of stand, up to 450 years, using historical trees as well, up to 637 years old. Phase shifts in growth gain reaction were defined. It has been stated, that there is a weak direct correlation between growth gain of the tree rings and the temperature and precipitation rates in taiga geocomplexes of the European North of Russia. Nevertheless, graph motions of dendrochronological and meteorological data of the warm period show coherence; their steadiness was estimated autocorrelationally, and the significant period covered approximately 20 years – i.e., growth gain of the tree rings is quite stable. Due to this fact, it is possible to conclude that natural processes are highly predictable. With the help of spectral analysis conducted, we evaluated interconnection in the area of frequency in terms of coherence and difference of phases. The collected graphs of the spectral density signal that there are significant tree rings growth gain and average temperature changes during vegetation periods of 40 and 13 years, also 19-22 years and 5-7 years. In taiga geocomplexes of the European North of Russia, radial growth gain of timber is limited exactly by warmth and humidity correlation, in the atmosphere, as well as in the ground, especially during vegetation periods.

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