Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota
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. We investigated high resolution carbon (C) accrual and peat decomposition rates...
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description | 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. 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 indicesand tochemically 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. Information on fine-scale variations in peat mass decomposition and loss across ombrotrophic bogs and a fen help interpret other diagenetic processes in peatlands. |
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A. ; McFarlane, K. J. ; Klein, A. S.</creator><creatorcontrib>Fissore, C. ; Nater, E. A. ; McFarlane, K. J. ; Klein, A. S. ; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</creatorcontrib><description>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. 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 indicesand tochemically 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. Information on fine-scale variations in peat mass decomposition and loss across ombrotrophic bogs and a fen help interpret other diagenetic processes in peatlands.</description><identifier>ISSN: 0168-2563</identifier><identifier>EISSN: 1573-515X</identifier><identifier>DOI: 10.1007/s10533-019-00591-4</identifier><language>eng</language><publisher>Cham: Springer Science + Business Media</publisher><subject>Accumulation ; Analytical methods ; Biogeosciences ; Bogs ; Carbon ; Cellulose ; Chronology ; Decomposition ; Depth ; Diagenesis ; Dynamics ; Earth and Environmental Science ; Earth Sciences ; Ecosystems ; Environmental Chemistry ; ENVIRONMENTAL SCIENCES ; Fens ; Frozen ground ; Geochemistry ; Humification ; Life Sciences ; Net Primary Productivity ; Organic chemistry ; ORIGINAL PAPERS ; Parameter estimation ; Peat ; Peat soils ; Peatlands ; Primary production ; Radiocarbon dating ; Soil ; Soil analysis ; Sphagnum</subject><ispartof>Biogeochemistry, 2019-10, Vol.145 (1/2), p.63-79</ispartof><rights>Springer Nature Switzerland AG 2019</rights><rights>Biogeochemistry is a copyright of Springer, (2019). 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A.</creatorcontrib><creatorcontrib>McFarlane, K. J.</creatorcontrib><creatorcontrib>Klein, A. S.</creatorcontrib><creatorcontrib>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</creatorcontrib><title>Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota</title><title>Biogeochemistry</title><addtitle>Biogeochemistry</addtitle><description>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. 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 indicesand tochemically 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. Information on fine-scale variations in peat mass decomposition and loss across ombrotrophic bogs and a fen help interpret other diagenetic processes in peatlands.</description><subject>Accumulation</subject><subject>Analytical methods</subject><subject>Biogeosciences</subject><subject>Bogs</subject><subject>Carbon</subject><subject>Cellulose</subject><subject>Chronology</subject><subject>Decomposition</subject><subject>Depth</subject><subject>Diagenesis</subject><subject>Dynamics</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Ecosystems</subject><subject>Environmental Chemistry</subject><subject>ENVIRONMENTAL SCIENCES</subject><subject>Fens</subject><subject>Frozen ground</subject><subject>Geochemistry</subject><subject>Humification</subject><subject>Life Sciences</subject><subject>Net Primary Productivity</subject><subject>Organic chemistry</subject><subject>ORIGINAL PAPERS</subject><subject>Parameter estimation</subject><subject>Peat</subject><subject>Peat soils</subject><subject>Peatlands</subject><subject>Primary production</subject><subject>Radiocarbon dating</subject><subject>Soil</subject><subject>Soil analysis</subject><subject>Sphagnum</subject><issn>0168-2563</issn><issn>1573-515X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kE9PwzAMxSMEEmPwBZCQKjgX7KZJ0yMaf6UxLiBxi5I0Y522ZCTZYd-edkVw42TZeu9n-xFyjnCNANVNRGCU5oB1DsBqzMsDMkJW0Zwh-zgkI0Au8oJxekxOYlwCQF0BHZHZnTWqUavMqKC9yxpr_HrjY5vavts5tW5NzFqXpUWwNttYlVbKNfvRzIe0sMFlL61zNvqkTsnRXK2iPfupY_L-cP82ecqnr4_Pk9tpbkosUs4EN40ohaoKxEoL0E2NFijXrGCsYfMGCqtR1KLpJkUhtNalVZXuHpxzSumYXA5cH1Mro2mTNQvjuytMksiRc152oqtBtAn-a2tjkku_Da67S3bIUnAusEcVg8oEH2Owc7kJ7VqFnUSQfbhyCFd2u-U-XNmj6WCKndh92vCH_td1MbiWMfnwu6cUFWBZ1fQbtcaFZA</recordid><startdate>20191001</startdate><enddate>20191001</enddate><creator>Fissore, C.</creator><creator>Nater, E. 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A.</au><au>McFarlane, K. J.</au><au>Klein, A. S.</au><aucorp>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota</atitle><jtitle>Biogeochemistry</jtitle><stitle>Biogeochemistry</stitle><date>2019-10-01</date><risdate>2019</risdate><volume>145</volume><issue>1/2</issue><spage>63</spage><epage>79</epage><pages>63-79</pages><issn>0168-2563</issn><eissn>1573-515X</eissn><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. 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subjects | Accumulation Analytical methods Biogeosciences Bogs Carbon Cellulose Chronology Decomposition Depth Diagenesis Dynamics Earth and Environmental Science Earth Sciences Ecosystems Environmental Chemistry ENVIRONMENTAL SCIENCES Fens Frozen ground Geochemistry Humification Life Sciences Net Primary Productivity Organic chemistry ORIGINAL PAPERS Parameter estimation Peat Peat soils Peatlands Primary production Radiocarbon dating Soil Soil analysis Sphagnum |
title | Decadal carbon decomposition dynamics in three peatlands in Northern Minnesota |
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