Humidity Changes Record in Sections of Valley Peatbog in Far East’s South

Multiproxy study of the sections of mares in the Bolshaya Ussurka River Basin allowed highlighting climate changes over the past 2900 years. Reconstructions are based on data on botanical, diatoms, and pollen analyses and radiocarbon dating. Moisture content changed most significantly. The periods of prolonged droughts, which coincided with the weakening of the summer monsoon, were established. A long dry period began about 2900 yr BP and continued up to 1360 yr BP. Dry conditions did not exclude f loods caused by strong rainfall caused by the passage of typhoons or deep cyclones. The Medieval Warm Period and Little Ice Age were humid and characterized by increased cyclogenesis. Short-term f luctuations in humidity were noted: droughts were about 530–460 yr BP, conditions became more humid about 400 yr BP and especially about 330–260 yr BP. The age ranges of periods with different flood activity and fires are determined. Correlation of events with data on the regional and global events is carried out. A different response of mountain and bog landscapes to short-period climatic changes has been established. In forest vegetation, the role of Korean pine changed significantly, the distribution of which controlled by changes in hydroclimatic conditions. Optimum environments for Korean pine forests’ development were 780–530 yr BP. Role of Korean pine decreased during dry phases and after fires. The most variable vegetation of the mares was during the Little Ice Age. Modern anthropogenic changes in landscapes are also recorded in the sections. Scale of floods has significantly increased under human impact.

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