The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene

Philip Camill, Charles E. Umbanhowar, Christoph Geiss, Mark B. Edlund, Will O. Hobbs, Allison Dupont, Catherine Doyle-Capitman, Matthew Ramos

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Small peat-forming ecosystems in arctic landscapes may play a significant role in the regional biogeochemistry of high-latitude systems, yet they are understudied compared to arctic uplands and other major peat-forming regions of the North. We present a new data set of 25 radiocarbon-dated permafrost peat cores sampled around eight low arctic lake sites in northern Manitoba (Canada) to examine the timing of peat initiation and controls on peat accumulation throughout the Holocene. We used macrofossils and charcoal to characterize changes in the plant community and fire, and we explored potential impacts of these local factors, as well as regional climatic change, on rates of C accumulation and C stocks. Peat initiation was variable across and within sites, suggesting the influence of local topography, but 56% of the cores initiated after 3000 B.P. Most cores initiated and remained as drier bog hummock communities, with few vegetation transitions in this landscape. C accumulation was relatively slow and did not appear to be correlated with Holocene-scale climatic variability, but C stocks in this landscape were substantial (mean = 45.4 kg C m−2), potentially accounting for 13.2 Pg C in the Taiga Shield ecozone. To the extent that small peat-forming systems are underrepresented in peatland mapping, soil organic carbon (SOC) stocks may be underestimated in arctic regions. Mean fire severity appeared to be negatively correlated with C accumulation rates. Initiation and accumulation of soil C may respond to both regional and local factors, and substantial lowland soil C stocks have the potential for biogeochemical impacts on adjacent aquatic ecosystems.

Original languageEnglish (US)
Pages (from-to)1672-1688
Number of pages17
JournalJournal of Geophysical Research: Biogeosciences
Volume122
Issue number7
DOIs
StatePublished - Jul 2017

Bibliographical note

Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • arctic
  • carbon
  • climate
  • fire
  • Holocene
  • peat

Continental Scientific Drilling Facility tags

  • PICEA

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