Vegetation history of a polygonal peatland, northern, Yukon
Pollen, macrofossils and matrix composition are described for a 221 cm core from a polygonal peatland overlying a late‐Wisconsin lakebed. A hydroseral succession of wetland communities occurred at the site, and included a submerged assemblage with Chara , a Carex aquatilis ‐ Eleocharis marsh, a fen,...
| Published in: | Boreas |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
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Wiley
1982
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| Online Access: | http://dx.doi.org/10.1111/j.1502-3885.1982.tb00715.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1982.tb00715.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1982.tb00715.x |
| Summary: | Pollen, macrofossils and matrix composition are described for a 221 cm core from a polygonal peatland overlying a late‐Wisconsin lakebed. A hydroseral succession of wetland communities occurred at the site, and included a submerged assemblage with Chara , a Carex aquatilis ‐ Eleocharis marsh, a fen, and finally a Sphagnum ‐ Ledum bog. A transition about 9,600 B.P. to a wetter S. balticum ‐ Andromeda carpet is attributed to formation of permaforst and polygonal ice wedges. This community, sometimes with S. compactum and Chamaedaphne , prevailed until about 3,000 B.P. when the polygon became high centered, and peat growth declined. Peat growth rate is determined from 11 14 C dates, and is used to calculate pollen influx. Apparent periodic oscillations every 2,000 years, in total influx, are not accepted as sufficient evidence of treeline fluctuations. |
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