Abstract
This paper presents the results of multidisciplinary investigations of the peat-bed under hummocky permafrosted boggy meadow within the Boguty basin. For the last 7600 years 4 evolutionary phases of peatbog formation within the drained part of Low Boguty Lake bottom were established and corresponding 4 pollen complexes were described. 18 radiocarbon dates suggest some chronological bench marks of postglacial landscape evolution in the region. After degradation of Sartan glaciation about 14000 BP, trees grew in now forestless areas at 11000 BP and 8500-7800 BP. The climate in the first half of the Holocene was warmer and more humid. Accumulation of lacustrine loams within the studied peatbog occurred before 7600 BP with predominated algae Pediastrum, Zygnemataceae and Botryococcus. After the lake level lowered in the result of destructing moraine dam, two lower peat horizons were developed about 7600 – 7200 BP. An episode of significant lake desiccation (later than 7200 BP) was recorded in all proxy archives. Further rise of water supply led to increasing the number of water-bog plants, diatomaceous, euglenic and green algae. At the same time, the pollen of xerophytes began to predominate in the pollen complexes, indicating aridization. The final stage reflects stable peatbog drying and its transformation into boggy meadow, decomposition and mineralization of peat.
Highlights
In the framework of our multidisciplinary investigations of paleoenvironmental changes in the southeastern part of the Russian Altai (SE Altai), and in order to reconstruct the postglacial climatically driven landscape evolution within the eastern periphery of the Chuya intermountain depression, the hummocky permafrosted boggy meadow was studied in the high mountainous Boguty basin
This area bordering with the Mongolian Altai is significantly less investigated in comparison with central parts of the Chuya depression – the largest intermountain basin in the SE Altai
Published under licence by IOP Publishing Ltd time, Late Bronze Age and Iron Epoch are described here. It makes multidisciplinary regional investigations, including presented in this paper analysis of peatbog, relevant for reconstructing the Holocene chronology and paleoenvironmental context of nomadic societies settling in this high-mountain area
Summary
In the framework of our multidisciplinary investigations of paleoenvironmental changes in the southeastern part of the Russian Altai (SE Altai), and in order to reconstruct the postglacial climatically driven landscape evolution within the eastern periphery of the Chuya intermountain depression, the hummocky permafrosted boggy meadow was studied in the high mountainous Boguty basin. The group analysis of biological composition conducted for 7 peat samples has allowed getting data on ecology of a local lacustrine-boggy system and to discriminate four evolutionary phases since the peatbog formation within the former lake bottom (figure 2).
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