Reconstruction of postglacial landscape evolution within the eastern periphery of Chuya depression on the basis of multidisciplinary analysis of peats in Boguty river basin, SE Altai, Russiaстатья
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Аннотация: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.