Myers-Smith, Isla H; Harden, J W; Wilmking, Martin; Fuller, C C; McGuire, A David; Chapin, F Stuart (2008): Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.817460, Supplement to: Myers-Smith, IH et al. (2008): Wetland succession in a permafrost collapse: interactions between fire and thermokarst. Biogeosciences, 5(5), 1273-1286, https://doi.org/10.5194/bg-5-1273-2008
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Abstract:
To determine the influence of fire and thermokarst in a boreal landscape, we investigated peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and nitrogen content of the peat profile indicate ~600 years of vegetation succession with a transition from a terrestrial forest to a sedge-dominated wetland over 100 years ago, and to a Sphagnum-dominated peatland in approximately 1970. The shift from sedge to Sphagnum, and a decrease in the detrended tree-ring width index of black spruce trees adjacent to the collapse coincided with an increase in the growing season temperature record from Fairbanks. This concurrent wetland succession and reduced growth of black spruce trees indicates a step-wise ecosystem-level response to a change in regional climate. In 2001, fire was observed coincident with permafrost collapse and resulted in lateral expansion of the peatland. These observations and the peat profile suggest that future warming and/or increased fire disturbance could promote permafrost degradation, peatland expansion, and increase carbon storage across this landscape; however, the development of drought conditions could reduce the success of both black spruce and Sphagnum, and potentially decrease the long-term ecosystem carbon storage.
Project(s):
Coverage:
Median Latitude: 64.640745 * Median Longitude: -148.333500 * South-bound Latitude: 64.640620 * West-bound Longitude: -148.333700 * North-bound Latitude: 64.640870 * East-bound Longitude: -148.333300
Date/Time Start: 2001-07-01T00:00:00 * Date/Time End: 2004-08-30T00:00:00
Event(s):
Tanana_R-plain * Latitude Start: 64.640620 * Longitude Start: -148.333700 * Latitude End: 64.640870 * Longitude End: -148.333300 * Date/Time Start: 2001-07-01T00:00:00 * Date/Time End: 2004-08-30T00:00:00 * Elevation Start: 132.0 m * Elevation End: 132.0 m * Location: Alaska, USA * Method/Device: Sampling permafrost (PERM)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Myers-Smith, IH; Harden, JW; Wilmking, M et al. (2008): (Table 1) Radiocarbon ages and δ¹³C values of peatland cores from Interior Alaska. https://doi.org/10.1594/PANGAEA.817458
- Myers-Smith, IH; Harden, JW; Wilmking, M et al. (2008): (Table 2) 137Cs, 210Pb and 226Ra activity and derived age of peatland cores from Interior Alaska. https://doi.org/10.1594/PANGAEA.817459