Dendrochronological analysis of conifers in avalanche catchments of the Northwestern Altai (Korgon River basin)-Reference-Cited by-同舟云学术

Dendrochronological analysis of conifers in avalanche catchments of the Northwestern Altai (Korgon River basin)

Published:2024-07-16 Issue:1 Volume:64 Page:81-95
ISSN:2412-3765
Container-title:Journal "Ice and Snow"
language:
Short-container-title:Lëd i sneg

Author:

Bykov N. I.¹,Rygalova N. V.¹,Shigimaga A. A.¹

Affiliation:

1. Water and Environmental Problems Institute, Siberian Branch, Russian Academy of Sciences

Abstract

The purpose of the study was to date the powerful snow avalanches occurred in the avalanche catchment area in the river Korgon basin (Northwestern Altai) by the dendrochronological method. The paper presents the results of the analysis of a number of dendrochronological indicators of avalanches: the age of trees, the relation between widths of annual rings from opposite sides of the trunk, the presence of reactive (compressional) wood and traumatic resin canals, the dates of death and formation of wounds in trees, the presence of clearing effects (a sharp increase in growth) in three avalanche catchments, as well as a complex dendrochronological index of the avalanche activity. The dates of releases of the powerful avalanches were established down to 1570. It has been found that against the background of increasing amount of winter precipitation in these catchments, there are different trends in occurrence of the avalanches, which is determined by their morphological properties. In the avalanche areas with steeper slopes, due to repeated unloading of the avalanche centers in winter, the probability of releasing of powerful avalanches decreases. For the same reason, the powerful avalanches do not release during the years of maximum snow accumulation. The trends in the avalanche activity in the region under consideration had been obtained for the first time. The dendrochronological index of the avalanche activity, which is the ratio of the number of the tree growth failures to the number of the examined trees, is a good indicator of a release of a powerful avalanche even at a value of 0.85, provided that the number of examined trees in the lower part of the transit zone and in the zone of accumulation is 25–35 units. The results of this study may be used to predict the territorial differentiation of changes in the avalanche activity due to climate change. In connection with the recreational development of the Altai territory, they may also be of practical importance.

Publisher

The Russian Academy of Sciences

Reference27 articles.

1. Benkova V. E., Schweingruber F. Kh. Anatomiya drevesiny rasteniy Rossii. Anatomy of wood plants in Russia. Bern: Haupt, 2004: 465 p. [In Russian].

2. Bykov N. I. Lichenometric studies of avalanche processes in Altai. Izvestiya Altayskogo gosudarstvennogo universiteta. News of ASU. 1999, 3 (13): 29–32 [In Russian].

3. Bykov N. I. Dendrochronology of snow avalanches and atmospheric circulation processes in the winter and transitional periods in Altai. Problemy rekonstruktsii klimata i prirodnoy sredy golotsena i pleystotsena Sibiri. Problems of reconstruction of the climate and natural environment of the Holocene and Pleistocene of Siberia. Novosibirsk: Publishing House of the Institute of Archeology and Ethnography of the Siberian Branch of the Russian Academy of Sciences. 2000, 2: 56–60 [In Russian].

4. Bykov N. I. Vegetation of avalanche collections of Altai and the possibilities of phytoindication of avalanche processes. Geografiya i prirodopol’zovaniye Sibiri. Geography and Nature Management of Siberia. 2013, 15: 23–31 [In Russian]

5. Bykov N. I. Avalanche collections of the river basin. Korgon (left tributary of the Charysh River) // Geografiya i prirodopol’zovaniye Sibiri, Geography and Nature Management of Siberia. 2015, 19: 25–45 [In Russian].