Long-term Arctic peatland dynamics, vegetation and climate history of the Pur-Taz region, Western Siberia |
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| Authors: | DOROTHY PETEET REI ANDREEV WILLIAM BARDEEN FRANCESCA MISTRETTA |
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| Institution: | NASA/Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA and Lamont Doherty Earth Ohservatory, Palisades NY 10964, USA;NASA/Goddurd Institute for Space Srudies, 2880 Broadway, New York, NY, USA and Institute of Geography RAS, Staromonetny 29, Moscow, 109017 Russia;Lamont Doherty Earth Observutory, Palisades, New York 10964, USA |
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| Abstract: | Stratigraphic analyses of peat composition, LOI, pollen, spores, macrofossils, charcoal and AMS ages are used to reconstruct the peatland. vegetation and climatic dynamics in the Pur-Taz region of western Siberia over 5000 years (9300-4500 BP). Section stratigraphy shows many changes from shallow lake sediment to different combinations of forestcd or open sedge, moss, and Equisetum fen and peatland environments. Macrofossil and pollen data indicate that Larix sibirica and Beth pubescens trees were the first to arrive, followed by Picea obovata . The dominance of Picea macrofossils 6000-5000 BP in the Pur-Taz peatland along with regional Picea pollen maxima indicate warmer conditions and movement of the spruce treeline northward at this time. The decline of pollen and macrofossils from all of these tree species in uppermost peats suggests a change in the environment less favorable for their growth, perhaps cooler tempratures and/or less moisture. Of major significance is the evidence for old ages of the uppermost peats in this area of Siberia, suggesting a real lack of peat accumulation in recent millennia or recent oxidation of uppermost peat. |
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