Comparative Reaction of Larch (Larix sibirica Ledeb.) Radial Increment to Climate Change in the Forest-Steppe and Highlands of Southern Siberia
V. I. KHARUK1,2, I. A. PETROV1, M. L. DVINSKAYA1, S. T. IM1,2,3, A. S. SHUSHPANOV1
1V. N. Sukachev Institute of Forest, SB RAS, 660036, Krasnoyarsk, Akademgorodok, 50/28
2Siberiаn Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
3Reshetnev Siberian State University of Science and Technology, 660037, Krasnoyarsk, Krasnoyarsky Rabochy ave., 31
Keywords: лиственница, изменения климата, лесостепь, высокогорные леса, индекс прироста, дефицит влаги, индекс засушливости, водный стресс и прирост, larch, climate change, forest-steppe, highland forests, growth index, water deficit, drought index, water stress and stress
Abstract
The influence of climate changes on larch radial increment (Larix sibirica Ledeb.) in conditions of a limited (forest-steppe) and sufficient (highlands of Kuznetsky Alatau, floodplain stands) humidification was considered. The relationship between growth index of larch trees (N = 257) and ecological-climatic variables was analyzed. In the forest-steppe, with the onset of warming, decrease in climate aridity, and increase in duration of growing season (1980s), an increase in larch growth index followed by its depression in the 1990s was observed. Radial increment depression was caused by an increase in vapor pressure deficit and arid climate due to rising air temperature. In the 2000s, radial increment fluctuations occurred with average values not exceeding those before the beginning of the current climate warming period. In the highlands, since the 1970s, there has been a general trend of increasing the larch radial increment, closely associated with the main limiting factor of growth - air temperature. At the same time, in arid years, radial increment depression was also noted in high-mountain and floodplain larch forests. When implementing «hard» climate scenarios (RCP 6.0, RCP 8.5), it is likely that larch growth index in the forest-steppe will decrease further and increase in areas of sufficient moisture.
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