The flux of organic matter through a peatland ecosystem: The role of cellulose, lignin, and their control of the ecosystem oxidation state

This study used thermogravimetric analysis (TGA) to study the transit of organic C through a peatland ecosystem. The biomass, litter, peat soil profile, particulate organic matter (POM), and dissolved organic matter (DOM) fluxes were sampled from the Moor House National Nature Reserve, a peat‐covered catchment in northern England where both the dry matter and carbon budget for the catchment were known. The study showed that although TGA traces showed distinct differences between organic matter reservoirs and fluxes, the traces could not readily be associated with particular functionalities or elemental properties. The TGA trace shows that polysaccharides are preferentially removed by humification and degradation with residual peat being dominated by lignin compositions. The DOM is derived from the degradation of lignin while the POM is derived from erosion of the peat profile. The carbon lost as gases (CO2 and CH4) was estimated to be composed of 92 to 95% polysaccharide carbon. The composition of the organic matter lost from the peat ecosystem means that the oxidative ratio (OR) of the ecosystem experienced by the atmosphere was between 0.96 and 0.99: currently, the Intergovernmental Panel on Climate Change uses an OR value of 1.1 for all ecosystems.

[1]  Julie Talbot,et al.  Insights and issues with estimating northern peatland carbon stocks and fluxes since the Last Glacial Maximum , 2017 .

[2]  T. Burt,et al.  The total phosphorus budget of a peat‐covered catchment , 2016 .

[3]  A. Lilly,et al.  Long-term macronutrient stoichiometry of UK ombrotrophic peatlands. , 2016, The Science of the total environment.

[4]  T. Burt,et al.  The effective oxidation state of a peatland , 2016 .

[5]  H. Sanei,et al.  Evaluating biodegradability of soil organic matter by its thermal stability and chemical composition , 2015 .

[6]  C. Masiello,et al.  Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2 , 2015 .

[7]  W. Oechel,et al.  The uncertain climate footprint of wetlands under human pressure , 2015, Proceedings of the National Academy of Sciences.

[8]  F. Worrall,et al.  Estimating the oxidative ratio of UK peats and agricultural soils , 2015 .

[9]  F. Worrall,et al.  Oxidative ratio (OR) of Southern African soils and vegetation: Updating the global OR estimate , 2015 .

[10]  J. L. Riley,et al.  The stoichiometry of carbon and nutrients in peat formation , 2015 .

[11]  H. Kondo,et al.  Observation of O2:CO2 exchange ratio for net turbulent fluxes and its application to forest carbon cycles , 2015, Ecological Research.

[12]  Harro A. J. Meijer,et al.  Atmospheric CO2, delta(O-2/N-2), APO and oxidative ratios from aircraft flask samples over Fyodorovskoye, Western Russia , 2014 .

[13]  C. Masiello,et al.  Controls on the oxidative ratio of net primary production in agricultural ecosystems , 2014, Biogeochemistry.

[14]  D. Charman,et al.  Holocene peatland carbon dynamics in the circum-Arctic region: An introduction , 2014 .

[15]  M. Väliranta,et al.  A database and synthesis of northern peatland soil properties and Holocene carbon and nitrogen accumulation , 2014 .

[16]  Atul K. Jain,et al.  Global Carbon Budget 2016 , 2016 .

[17]  H. Biester,et al.  Comparison of different methods to determine the degree of peat decomposition in peat bogs , 2013 .

[18]  C. Masiello,et al.  Estimating the oxidative ratio of the global terrestrial biosphere carbon , 2013, Biogeochemistry.

[19]  C. Evans,et al.  The rate of loss of dissolved organic carbon (DOC) through a catchment. , 2013 .

[20]  T. Burt,et al.  The multi-annual nitrogen budget of a peat-covered catchment--changing from sink to source? , 2012, The Science of the total environment.

[21]  H. Sanei,et al.  Standardisation of Rock–Eval pyrolysis for the analysis of recent sediments and soils , 2012 .

[22]  Hongmei Zhao,et al.  Forms and accumulation of soil P in a subalpine peatland of Mt. Changbai in Northeast China , 2012 .

[23]  R. Evershed,et al.  Pyrolysis GC-MS as a rapid screening tool for determination of peat-forming plant composition in cores from ombrotrophic peat , 2011 .

[24]  C. Rödenbeck,et al.  The CO 2 release and Oxygen uptake from Fossil Fuel Emission Estimate (COFFEE) dataset: effects from varying oxidative ratios , 2011 .

[25]  R. Conant,et al.  Biological, chemical and thermal indices of soil organic matter stability in four grassland soils , 2011 .

[26]  J. Holden,et al.  Temperature and surface lapse rate change: a study of the UK's longest upland instrumental record , 2011 .

[27]  Douglas E. LaRowe,et al.  Degradation of natural organic matter: a thermodynamic analysis , 2011 .

[28]  F. Worrall,et al.  Carbon budgets of an upland blanket bog managed by prescribed fire , 2010 .

[29]  T. Burt,et al.  The complete carbon budget of a drained peat catchment , 2010 .

[30]  D. Peteet,et al.  Late-glacial and Holocene δ15N and δ13C variation from a Kenai Peninsula, Alaska peatland. , 2010 .

[31]  A. Plante,et al.  Application of thermal analysis techniques in soil science. , 2009 .

[32]  T. Burt,et al.  The multi-annual carbon budget of a peat-covered catchment. , 2009, The Science of the total environment.

[33]  H. Laudon,et al.  Contemporary carbon accumulation in a boreal oligotrophic minerogenic mire – a significant sink after accounting for all C‐fluxes , 2008 .

[34]  J. Randerson,et al.  Evaluating two experimental approaches for measuring ecosystem carbon oxidation state and oxidative ratio , 2008 .

[35]  T. Miano,et al.  Diagenetic trends in the phenolic constituents of Sphagnum-dominated peat and its corresponding humic acid fraction , 2008 .

[36]  A. Francez,et al.  FTIR spectroscopy can be used as a screening tool for organic matter quality in regenerating cutover peatlands , 2008 .

[37]  Y. Kuzyakov,et al.  Thermal stability of soil organic matter pools and their δ13C values after C3–C4 vegetation change , 2007 .

[38]  P. Richard,et al.  Contemporary carbon balance and late Holocene carbon accumulation in a northern peatland , 2007 .

[39]  D. Manning,et al.  Coupling of thermal analysis with quadrupole mass spectrometry and isotope ratio mass spectrometry for simultaneous determination of evolved gases and their carbon isotopic composition , 2006 .

[40]  J. Randerson,et al.  Is carbon within the global terrestrial biosphere becoming more oxidized? Implications for trends in atmospheric O2 , 2006 .

[41]  C. Chenu,et al.  Changes in clay-associated organic matter quality in a C depletion sequence as measured by differential thermal analyses , 2005 .

[42]  D. Manning,et al.  Use of Thermogravimetry–Differential Scanning Calorimetry to Characterize Modelable Soil Organic Matter Fractions , 2005 .

[43]  C. Masiello,et al.  Cycling and composition of organic matter in terrestrial and marine ecosystems , 2004 .

[44]  M. Turetsky,et al.  Dating recent peat deposits , 2004, Wetlands.

[45]  M. Billett,et al.  Linking land‐atmosphere‐stream carbon fluxes in a lowland peatland system , 2004 .

[46]  Jeff Warburton,et al.  Carbon budget for a British upland peat catchment. , 2003, The Science of the total environment.

[47]  P. Brookes,et al.  Hyphenated techniques of thermal analysis for characterisation of soil humic substances , 2003 .

[48]  A. Benedetti,et al.  Humic substances along the profile of two Typic Haploxerert , 2002 .

[49]  P. Tans,et al.  Global Carbon Sinks and Their Variability Inferred from Atmospheric O2 and δ13C , 2000 .

[50]  J. Holden,et al.  Runoff generation and water table fluctuations in blanket peat: evidence from UK data spanning the dry summer of 1995 , 1999 .

[51]  Ralph F. Keeling,et al.  Partitioning of the global fossil CO2 sink using a 19‐year trend in atmospheric O2 , 1999 .

[52]  Martin Heimann,et al.  Global and hemispheric CO2 sinks deduced from changes in atmospheric O2 concentration , 1996, Nature.

[53]  J. Severinghaus.  Studies of the terrestrial O{sub 2} and carbon cycles in sand dune gases and in biosphere 2 , 1995 .

[54]  J. Boon,et al.  A combined pyrolysis mass spectrometric and light microscopic study of peatified Calluna wood isolated from raised bog peat deposits , 1994 .

[55]  Ralph F. Keeling,et al.  Seasonal and interannual variations in atmospheric oxygen and implications for the global carbon cycle , 1992, Nature.

[56]  E. Gorham.  Northern Peatlands: Role in the Carbon Cycle and Probable Responses to Climatic Warming. , 1991, Ecological applications : a publication of the Ecological Society of America.

[57]  E. Kristensen.  Characterization of biogenic organic matter by stepwise thermogravimetry (STG) , 1990 .

[58]  Curtis J. Richardson,et al.  Processes controlling movement, storage and export of phosphorus in a fen peatland , 1986 .

[59]  George Henry Dunteman,et al.  Introduction To Multivariate Analysis , 1984 .

[60]  R. Hodson,et al.  Anaerobic Biodegradation of the Lignin and Polysaccharide Components of Lignocellulose and Synthetic Lignin by Sediment Microflora , 1984, Applied and environmental microbiology.

[61]  R. Hodson,et al.  Anaerobic Biodegradation of the Lignin and Polysaccharide Components of Lignocellulose and Synthetic Lignin by Sediment Microflora , 1984, Applied and environmental microbiology.

[62]  H. Hemond.  The Nitrogen Budget of Thoreau's Bog , 1983 .

[63]  R. Loomis,et al.  Elemental Composition of Biomass and its Relation to Energy Content, Growth Efficiency, and Growth Yield , 1981 .

[64]  G. W. Robertson,et al.  Pyrolysis—mass spectrometry studies of humification in a peat and a peaty podzol , 1980 .

[65]  G. Forrest.  Structure and Production of North Pennine Blanket Bog Vegetation , 1971 .

[66]  A. Manning,et al.  Studies of Recent Changes in Atmospheric O 2 Content , 2014 .

[67]  Z. Yu,et al.  Biogeosciences Northern peatland carbon stocks and dynamics : a review , 2012 .

[68]  P. Buurman,et al.  Chapter 10 Molecular chemistry by pyrolysis–GC/MS of selected samples of the Penido Vello peat deposit, Galicia, NW Spain , 2004 .

[69]  Robert J. Scholes,et al.  The Carbon Cycle and Atmospheric Carbon Dioxide , 2001 .

[70]  P. Tans,et al.  Global carbon sinks and their variability inferred from atmospheric O2 and delta13C. , 2000, Science.

[71]  D. Vitt,et al.  Fossil Carbon/Nitrogen Ratios as a Measure of Peat Decomposition , 1996 .

[72]  J. Blackford,et al.  Determining the degree of peat decomposition for peat-based palaeoclimatic studies , 1993 .

[73]  H. Rudolph,et al.  Occurrence and metabolism of sphagnum acid in the cell walls of bryophytes , 1985 .