Multi-proxy, medium-resolution Holocene and high-resolution late Holocene records from a southern Ontario ombrotrophic peatland examined factors affecting carbon accumulation. These records include radiometric dating, calculation of long-term apparent rate of carbon accumulation (LORCA), determination of peat humification, and analysis of plant macro-remains, charcoal and nitrogen concentration. Coupled with existing paleo-climate reconstructions, these data were integrated to determine how factors, such as climate, autogenic succession and fire, influenced carbon accumulation. Mean LORCA were similar to other northern and temperate peatlands. LORCA was high during the marsh phase and decreased following a transition to fen. Neoglacial cooling and the fen to bog transition did not lead to significant differences in LORCA. The last millennium did not exhibit much variation in LORCA; however, there is evidence for warming associated with the Medieval Climate Anomaly. Recent disturbances did impact LORCA; however, fire did not play a role in peatland dynamics in the pre-industrial Holocene.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/35688 |
| Date | 17 July 2013 |
| Creators | Shiller, Jennifer Ann |
| Contributors | Finkelstein, Sarah A., Cowling, Sharon A. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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