Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota
Abstract
The uppermost portion of the peat profile, an area of active diagenetic processes, is exceedingly important for understanding peatland dynamics and the diagenesis and geochemistry of atmospherically-deposited materials. In this study, we investigated high resolution carbon (C) accrual and peat decomposition rates at two Sphagnum-rich ombrotrophic bogs and one fen in northern Minnesota, USA by analyzing 1 cm increments from 30 cm thick intact frozen blocks of peat soil. We conducted radiocarbon analysis of Sphagnum cellulose to determine peat age and net C accumulation at each depth interval. Calibrated peat ages were determined using CALIBomb and a compilation of calibration datasets for the pre-bomb period. We fit data with a negative exponential accumulation model and used model-derived parameters to estimate net primary productivity (NPP) and a peat decomposition rate constant k. FTIR spectroscopy and C:N were used to derive humification indices and to chemically characterize the peat. NPP ranged from 180 to 266 g C m-2 year-1, k ranged from 0.015 to 0.019 year-1. Net C accumulation rates ranged from 112 to 174 g C m-2 year-1 at 25 years and 70 to 113 g C m-2 year-1 at 50 years. Mass loss was up to 55% during the firstmore »
- Authors:
-
[1];
- Whittier College, CA (United States)
- Univ. of Minnesota, St. Paul, MN (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1616664
- Report Number(s):
- LLNL-JRNL-749770
Journal ID: ISSN 0168-2563; 934951
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Biogeochemistry
- Additional Journal Information:
- Journal Volume: 145; Journal Issue: 1-2; Journal ID: ISSN 0168-2563
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Fissore, C., Nater, E. A., McFarlane, K. J., and Klein, A. S. Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota. United States: N. p., 2019.
Web. doi:10.1007/s10533-019-00591-4.
Fissore, C., Nater, E. A., McFarlane, K. J., & Klein, A. S. Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota. United States. https://doi.org/10.1007/s10533-019-00591-4
Fissore, C., Nater, E. A., McFarlane, K. J., and Klein, A. S. Thu .
"Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota". United States. https://doi.org/10.1007/s10533-019-00591-4. https://www.osti.gov/servlets/purl/1616664.
@article{osti_1616664,
title = {Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota},
author = {Fissore, C. and Nater, E. A. and McFarlane, K. J. and Klein, A. S.},
abstractNote = {The uppermost portion of the peat profile, an area of active diagenetic processes, is exceedingly important for understanding peatland dynamics and the diagenesis and geochemistry of atmospherically-deposited materials. In this study, we investigated high resolution carbon (C) accrual and peat decomposition rates at two Sphagnum-rich ombrotrophic bogs and one fen in northern Minnesota, USA by analyzing 1 cm increments from 30 cm thick intact frozen blocks of peat soil. We conducted radiocarbon analysis of Sphagnum cellulose to determine peat age and net C accumulation at each depth interval. Calibrated peat ages were determined using CALIBomb and a compilation of calibration datasets for the pre-bomb period. We fit data with a negative exponential accumulation model and used model-derived parameters to estimate net primary productivity (NPP) and a peat decomposition rate constant k. FTIR spectroscopy and C:N were used to derive humification indices and to chemically characterize the peat. NPP ranged from 180 to 266 g C m-2 year-1, k ranged from 0.015 to 0.019 year-1. Net C accumulation rates ranged from 112 to 174 g C m-2 year-1 at 25 years and 70 to 113 g C m-2 year-1 at 50 years. Mass loss was up to 55% during the first 50 years of peat accumulation. Decomposition is greater at depth in the bogs—where 25 cm of peat correspond to 55 years of peat accumulation—than in the fen, where peat age is approximately 25 years at 25 cm depth. Lastly, information on fine-scale variations in peat mass decomposition and loss across ombrotrophic bogs and a fen help interpret other diagenetic processes in peatlands.},
doi = {10.1007/s10533-019-00591-4},
journal = {Biogeochemistry},
number = 1-2,
volume = 145,
place = {United States},
year = {Thu Sep 05 00:00:00 EDT 2019},
month = {Thu Sep 05 00:00:00 EDT 2019}
}
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