1:45 PM - 3:15 PM
[MIS01-P17] COMPARISON OF PINUS KORAIENSIS CLIMATE RESPONSE ON WEST AND EAST MACROSLOPES OF THE MIDDLE SIKHOTE-ALIN MOUNTAIN RANGE
Keywords:Sikhote Alin, Pinus koraiensis, tree rings, climate response
Climate is currently one of the main drivers of forest dynamics. Understanding trees' response to it is the key issue in terms of IPCC agenda and Global Climate Change. The primary forests of the Russian Far East are of special interest among scientists in recent years, notably there are many gaps of dendroclimatic studies. The Sikhote-Alin Mountain Range is the mountain monsoon region spread along the Japanese sea at 1200 km. It is covered by mixed multilevel stands. The mixed conifer-broadleaved forest is characterized by natural dynamics of uneven species and dominated by Korean pine (Pinus koraiensis Sieb.et Zucc) in the canopy level. Korean pine is a shade-tolerant species and reaches 500 years of age in undisturbed habitat.
In general, the Sikhote-Alin has an asymmetric lateral profile. The western macroslope is flatter than the eastern one. Moreover, it is worth taking into account the different ecological conditions on the slopes of different exposures (e.g. intake of solar energy). The climate on the eastern slopes is quite mild and snowy with frequent tropical cyclones from the Japanese Sea, while on the western slopes it is sharper continental with little snow. Average monthly temperature varies from the coast to inland: the average annual air temperature on the eastern macroslope is 1,5-2 degrees of celsius, whereas it is 0,4-1 degrees of celsius on the western one. Total annual precipitation is 500-600 mm on the western macroslope, on the eastern it is 700-750 mm, which mostly falls in August-September.
The comparison analysis of Korean pine climate response is carried out on two Sikhote-Alin macroslopes - west and east. The control distance between slopes is 100 km. The cores were extracted at DBH from almost 500 trees in Sikhote-Alin Biosphere Reserve (east slope) and in the hunt “Sidatur” (west slope) from 14 sample plots in total. The study areas are undisturbed and unexposed to fires, logging, and pathogens. After coring the samples were air-dried, glued to holders, polished, scanned. The tree-ring widths were measured in semi-automatic mode. Individual tree-ring series were cross-dated, visually checked, standardized and chronologies were correlated with main climate factors using dplR and treeclim packages of R Studio software.
The results of climate response analyses of Korean pine were obtained over the last 80 years. We compared west and east macroslopes of the Middle Sikhote-Alin Mountain Range in view of the climatic and topographic differences of the regions. The outcomes may be used for climate reconstructions and modeling, developing a more effective forest policy due to the changing climate.
Acknowledgements: the study was supported by Russian Science Foundation project 23-24-00511.
In general, the Sikhote-Alin has an asymmetric lateral profile. The western macroslope is flatter than the eastern one. Moreover, it is worth taking into account the different ecological conditions on the slopes of different exposures (e.g. intake of solar energy). The climate on the eastern slopes is quite mild and snowy with frequent tropical cyclones from the Japanese Sea, while on the western slopes it is sharper continental with little snow. Average monthly temperature varies from the coast to inland: the average annual air temperature on the eastern macroslope is 1,5-2 degrees of celsius, whereas it is 0,4-1 degrees of celsius on the western one. Total annual precipitation is 500-600 mm on the western macroslope, on the eastern it is 700-750 mm, which mostly falls in August-September.
The comparison analysis of Korean pine climate response is carried out on two Sikhote-Alin macroslopes - west and east. The control distance between slopes is 100 km. The cores were extracted at DBH from almost 500 trees in Sikhote-Alin Biosphere Reserve (east slope) and in the hunt “Sidatur” (west slope) from 14 sample plots in total. The study areas are undisturbed and unexposed to fires, logging, and pathogens. After coring the samples were air-dried, glued to holders, polished, scanned. The tree-ring widths were measured in semi-automatic mode. Individual tree-ring series were cross-dated, visually checked, standardized and chronologies were correlated with main climate factors using dplR and treeclim packages of R Studio software.
The results of climate response analyses of Korean pine were obtained over the last 80 years. We compared west and east macroslopes of the Middle Sikhote-Alin Mountain Range in view of the climatic and topographic differences of the regions. The outcomes may be used for climate reconstructions and modeling, developing a more effective forest policy due to the changing climate.
Acknowledgements: the study was supported by Russian Science Foundation project 23-24-00511.