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Title: Local Spatial Heterogeneity of Holocene Carbon Accumulation throughout the Peat Profile of an Ombrotrophic Northern Minnesota Bog

Abstract

Here, we evaluated the spatial heterogeneity of historical carbon accumulation rates in a forested, ombrotrophic bog in Minnesota to aid understanding of responses to an ongoing decade-long warming manipulation. Eighteen peat cores indicated that the bog has been accumulating carbon for over 11,000 years, to yield 176±40 kg C m–2 to 225±58 cm of peat depth. Estimated peat basal ages ranged from 5100 to 11,100 cal BP. The long-term apparent rate of carbon accumulation over the entire peat profile was 22±2 kg C m–2yr–1. Plot location within the study area did not affect carbon accumulation rates, but estimated basal ages were younger in profiles from plots closer to the bog lagg and farther from the bog outlet. In addition, carbon accumulation varied considerably over time. Early Holocene net carbon accumulation rates were 30±6 g C m–2yr–1. Around 3300 calendar BP, net carbon accumulation rates dropped to 15±8 g C m–2yr–1until the last century when net accumulation rates increased again to 74±57 g C m–2yr–1. During this period of low accumulation, regional droughts may have lowered the water table, allowing for enhanced aerobic decomposition and making the bog more susceptible to fire. These results suggest that experimental warming treatments, as wellmore » as a future warmer climate may reduce net carbon accumulation in peat in this and other southern boreal peatlands. Furthermore, our we caution against historical interpretations extrapolated from one or a few peat cores.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1439959
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Radiocarbon
Additional Journal Information:
Journal Volume: 60; Journal Issue: 03; Journal ID: ISSN 0033-8222
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; boreal peatland; carbon cycling; forested wetland; peat; radiocarbon AMS dating

Citation Formats

McFarlane, Karis J., Hanson, Paul J., Iversen, Colleen M., Phillips, Jana Randolph, and Brice, Deanne Jane. Local Spatial Heterogeneity of Holocene Carbon Accumulation throughout the Peat Profile of an Ombrotrophic Northern Minnesota Bog. United States: N. p., 2018. Web. doi:10.1017/RDC.2018.37.
McFarlane, Karis J., Hanson, Paul J., Iversen, Colleen M., Phillips, Jana Randolph, & Brice, Deanne Jane. Local Spatial Heterogeneity of Holocene Carbon Accumulation throughout the Peat Profile of an Ombrotrophic Northern Minnesota Bog. United States. doi:10.1017/RDC.2018.37.
McFarlane, Karis J., Hanson, Paul J., Iversen, Colleen M., Phillips, Jana Randolph, and Brice, Deanne Jane. Wed . "Local Spatial Heterogeneity of Holocene Carbon Accumulation throughout the Peat Profile of an Ombrotrophic Northern Minnesota Bog". United States. doi:10.1017/RDC.2018.37. https://www.osti.gov/servlets/purl/1439959.
@article{osti_1439959,
title = {Local Spatial Heterogeneity of Holocene Carbon Accumulation throughout the Peat Profile of an Ombrotrophic Northern Minnesota Bog},
author = {McFarlane, Karis J. and Hanson, Paul J. and Iversen, Colleen M. and Phillips, Jana Randolph and Brice, Deanne Jane},
abstractNote = {Here, we evaluated the spatial heterogeneity of historical carbon accumulation rates in a forested, ombrotrophic bog in Minnesota to aid understanding of responses to an ongoing decade-long warming manipulation. Eighteen peat cores indicated that the bog has been accumulating carbon for over 11,000 years, to yield 176±40 kg C m–2 to 225±58 cm of peat depth. Estimated peat basal ages ranged from 5100 to 11,100 cal BP. The long-term apparent rate of carbon accumulation over the entire peat profile was 22±2 kg C m–2yr–1. Plot location within the study area did not affect carbon accumulation rates, but estimated basal ages were younger in profiles from plots closer to the bog lagg and farther from the bog outlet. In addition, carbon accumulation varied considerably over time. Early Holocene net carbon accumulation rates were 30±6 g C m–2yr–1. Around 3300 calendar BP, net carbon accumulation rates dropped to 15±8 g C m–2yr–1until the last century when net accumulation rates increased again to 74±57 g C m–2yr–1. During this period of low accumulation, regional droughts may have lowered the water table, allowing for enhanced aerobic decomposition and making the bog more susceptible to fire. These results suggest that experimental warming treatments, as well as a future warmer climate may reduce net carbon accumulation in peat in this and other southern boreal peatlands. Furthermore, our we caution against historical interpretations extrapolated from one or a few peat cores.},
doi = {10.1017/RDC.2018.37},
journal = {Radiocarbon},
number = 03,
volume = 60,
place = {United States},
year = {2018},
month = {5}
}

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    Works referencing / citing this record:

    Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota
    journal, September 2019


    A Subgrid Approach for Modeling Microtopography Effects on Overland Flow
    journal, September 2018

    • Jan, Ahmad; Coon, Ethan T.; Graham, Jake D.
    • Water Resources Research, Vol. 54, Issue 9
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