The problem of cross-dating of Siberian pine and Siberian larch on the upper forest boundary in the Altai-Sayan ecoregion
V. S. MYGLAN, V. V. BARINOV, A. N. NAZAROV, A. V. TAINIK
Siberian Federal University, Krasnoyarsk, Russia
Keywords: dendrochronology, blue intensity (BI), tree-ring chronology, Siberian larch (Larix sibirica Ldb.), Siberian pine (Pinus sibirica Du Tour), Southern Siberia
Abstract
In dendroclimatic studies, there is a need for high-quality data series reflecting the state of the environment in the past. The construction of long-term tree-ring width (TRW) chronologies (in terms of the combined qualities of being one of the best sources of paleo-climatic information) is associated with the problem of finding a source of paleo wood, which will allow it to extend further into the past. The paper considers the prospect of extending the existing 2367-year TRW chronology (on the Siberian larch) due to the attraction of wood of Siberian pine, which is widely presented in collections collected on the premises of the Altai glaciers. The results of consideration of various parameters of annual rings, clearly and convincingly demonstrated that at the upper edge of the forest, the use of such parameter, as the delta of optical density of the annual ring will allow reliably to cross-date samples of different tree species and extend this TRW chronology to the past.
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