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Biogeochemistry

, Volume 109, Issue 1–3, pp 253–270 | Cite as

Processes controlling DOC in pore water during simulated drought cycles in six different UK peats

  • J. M. Clark
  • A. Heinemeyer
  • P. Martin
  • S. H. Bottrell
Article

Abstract

The effect of episodic drought on dissolved organic carbon (DOC) dynamics in peatlands has been the subject of considerable debate, as decomposition and DOC production is thought to increase under aerobic conditions, yet decreased DOC concentrations have been observed during drought periods. Decreased DOC solubility due to drought-induced acidification driven by sulphur (S) redox reactions has been proposed as a causal mechanism; however evidence is based on a limited number of studies carried out at a few sites. To test this hypothesis on a range of different peats, we carried out controlled drought simulation experiments on peat cores collected from six sites across Great Britain. Our data show a concurrent increase in sulphate (SO4) and a decrease in DOC across all sites during simulated water table draw-down, although the magnitude of the relationship between SO4 and DOC differed between sites. Instead, we found a consistent relationship across all sites between DOC decrease and acidification measured by the pore water acid neutralising capacity (ANC). ANC provided a more consistent measure of drought-induced acidification than SO4 alone because it accounts for differences in base cation and acid anions concentrations between sites. Rewetting resulted in rapid DOC increases without a concurrent increase in soil respiration, suggesting DOC changes were primarily controlled by soil acidity not soil biota. These results highlight the need for an integrated analysis of hydrologically driven chemical and biological processes in peatlands to improve our understanding and ability to predict the interaction between atmospheric pollution and changing climatic conditions from plot to regional and global scales.

Keywords

Dissolved organic carbon DOC Sulphate Drought Episodic acidification Peat Climate change 

Notes

Acknowledgments

This research was supported by the School of Geography, University of Leeds Research Development Fund and Natural Environment Research Council (NERC) (NE/D00599X/1). J.M. Clark was also supported by a fellowship from the Grantham Institute for Climate Change, Imperial College. A. Heinemeyer was funded through a NERC grant (F14/G6/105) as part of the Centre for Terrestrial Carbon Dynamics. We thank The Applecross Estate, Scottish Natural Heritage, Forestry Commission, Natural England, Jeff Dowey and Simon Bennett-Evans for access to the field sites; Ron Smith (CEH Edinburgh) for providing deposition estimates; Miles Ratcliffe, David Ashley and Rachel Gasior for assistance with the soil analysis; David Cooper and Vicky Bell (CEH) for help calculating baseline climatic data; UK Meteorological Office. MIDAS Land Surface Stations data (1853-current), [Internet]. British Atmospheric Data Centre, 2006, 2010. Available from http://badc.nerc.ac.uk/data/ukmo-midas. We also thank two anonymous referees and the editors for their comments which have helped to improve the manuscript.

References

  1. Bell VA, Moore RJ (1999) An elevation-dependent snowmelt model for upland Britain. Hydrol Process 13(12–13):1887–1903CrossRefGoogle Scholar
  2. Berendse F, Van Breemen N, Rydin H, Buttler A, Heijmans M, Hoosbeek MR, Lee JA, Mitchell E, Saarinen T, Vasander H, Wallen B (2001) Raised atmospheric CO2 levels and increased N deposition cause shifts in plant species composition and production in Sphagnum bogs. Glob Change Biol 7(5):591–598CrossRefGoogle Scholar
  3. Blodau C, Moore TR (2003) Experimental response of peatland carbon dynamics to a water table fluctuation. Aquat Sci 65(1):47–62CrossRefGoogle Scholar
  4. Borken W, Matzner E (2009) Reappraisal of drying and wetting effects on C and N mineralization and fluxes in soils. Glob Change Biol 15(4):808–824CrossRefGoogle Scholar
  5. Bottrell S, Coulson J, Spence M, Roworth P, Novak M, Forbes L (2004) Impacts of pollutant loading, climate variability and site management on the surface water quality of a lowland raised bog, Thorne Moors, E. England, UK. Appl Geochem 19(3):413–422CrossRefGoogle Scholar
  6. Chapman PJ, Clark JM, Reynolds B, Adamson JK (2008) The influence of organic acids in relation to acid deposition in controlling the acidity of soil and stream waters on a seasonal basis. Environ Pollut 151(1):110–120CrossRefGoogle Scholar
  7. CLAG (1994) Critical Loads Advisory Group. Summary report to the Department of Environment, Institute of Terrestrial Ecology, EdinburghGoogle Scholar
  8. Clark JM (2005) Environmental controls on the production and export of dissolved organic carbon from an upland peat catchment. PhD Thesis, University of Leeds, UKGoogle Scholar
  9. Clark JM, Chapman PJ, Adamson JK, Lane SN (2005) Influence of drought-induced acidification on the mobility of dissolved organic carbon in peat soils. Glob Change Biol 11(5):791–809CrossRefGoogle Scholar
  10. Clark JM, Chapman PJ, Heathwaite AL, Adamson JK (2006) Suppression of dissolved organic carbon by sulfate induced acidification during simulated droughts. Environ Sci Technol 40(6):1776–1783CrossRefGoogle Scholar
  11. Clark JM, Lane SN, Chapman PJ, Adamson JK (2007) Export of dissolved organic carbon from an upland peatland during storm events: implications for flux estimates. J Hydrol 346:438–447CrossRefGoogle Scholar
  12. Clark JM, Ashley D, Wagner M, Chapman PJ, Lane SN, Evans CD, Heathwaite AL (2009) Increased temperature sensitivity of net DOC production from ombrotrophic peat due to water table draw-down. Glob Change Biol 15(4):794–807CrossRefGoogle Scholar
  13. Clark JM, Bottrell SH, Evans CD, Monteith DT, Bartlett R, Rose R, Newton RJ, Chapman PJ (2010) The importance of the relationship between scale and process in understanding long-term DOC dynamics. Sci Total Environ 408(13):2768–2775CrossRefGoogle Scholar
  14. Clark JM, van der Heijden GMF, Palmer SM, Chapman PJ, Bottrell SH (2011) Variation in the sensitivity of DOC release between different organic soils following H2SO4 and sea-salt additions. Eur J Soil Sci 62(2):267–284CrossRefGoogle Scholar
  15. Cooper DM (2005) Evidence of sulphur and nitrogen deposition signals at the United Kingdom Waters Monitoring Network sites. Environ Pollut 137(1):41–54CrossRefGoogle Scholar
  16. Crawley MJ (2007) The R book. Wiley, ChichesterCrossRefGoogle Scholar
  17. Dillon PJ, Molot LA (2005) Long-term trends in catchment export and lake retention of dissolved organic carbon, dissolved organic nitrogen, total iron, and total phosphorus: the Dorset, Ontario, study, 1978–1998. J Geophys Res Biogeosci 110(G1):G01002CrossRefGoogle Scholar
  18. Donahue WF, Schindler DW, Page SJ, Stainton MP (1998) Acid induced changes in DOC quality in an experimental whole-lake manipulation. Environ Sci Technol 32(19):2954–2960CrossRefGoogle Scholar
  19. Dytham C (2011) Choosing and using statistics: a biologist’s guide, 3rd edn. Wiley-Blackwell, ChichesterGoogle Scholar
  20. Eimers MC, Watmough SA, Buttle JM (2008a) Long-term trends in dissolved organic carbon concentration: a cautionary note. Biogeochemistry 87(1):71–81CrossRefGoogle Scholar
  21. Eimers MC, Watmough SA, Buttle JM, Dillon PJ (2008b) Examination of the potential relationship between droughts, sulphate and dissolved organic carbon at a wetland-draining stream. Glob Change Biol 14(4):938–948CrossRefGoogle Scholar
  22. Evans CD, Freeman C, Monteith DT, Reynolds B, Fenner N (2002) Climate change—terrestrial export of organic carbon—reply. Nature 415(6874):862CrossRefGoogle Scholar
  23. Evans CD, Chapman PJ, Clark JM, Monteith DT, Cresser MS (2006) Alternative explanations for rising dissolved organic carbon export from organic soils. Glob Change Biol 12(11):2044–2053CrossRefGoogle Scholar
  24. Evans C, Goodale C, Caporn S, Dise N, Emmett B, Fernandez I, Field C, Findlay S, Lovett G, Meesenburg H, Moldan F, Sheppard L (2008) Does elevated nitrogen deposition or ecosystem recovery from acidification drive increased dissolved organic carbon loss from upland soil? A review of evidence from field nitrogen addition experiments. Biogeochemistry 91(1):13–35CrossRefGoogle Scholar
  25. Fenner N, Freeman C, Reynolds B (2005) Hydrological effects on the diversity of phenolic degrading bacteria in a peatland: implications for carbon cycling. Soil Biol Biochem 37(7):1277–1287CrossRefGoogle Scholar
  26. Freeman C, Lock MA, Reynolds B (1993) Fluxes of CO2, CH4 and N2O from a Welsh peatland following simulation of water-table draw-down-potential feedback to climatic-change. Biogeochemistry 19(1):51–60CrossRefGoogle Scholar
  27. Freeman C, Evans CD, Monteith DT, Reynolds B, Fenner N (2001a) Export of organic carbon from peat soils. Nature 412(6849):785CrossRefGoogle Scholar
  28. Freeman C, Ostle N, Kang H (2001b) An enzymic ‘latch’ on a global carbon store—a shortage of oxygen locks up carbon in peatlands by restraining a single enzyme. Nature 409(6817):149CrossRefGoogle Scholar
  29. Freeman C, Fenner N, Ostle NJ, Kang H, Dowrick DJ, Reynolds B, Lock MA, Sleep D, Hughes S, Hudson J (2004) Export of dissolved organic carbon from peatlands under elevated carbon dioxide levels. Nature 430(6996):195–198CrossRefGoogle Scholar
  30. Glatzel S, Lemke S, Gerold G (2006) Short-term effects of an exceptionally hot and dry summer on decomposition of surface peat in a restored temperate bog. Eur J Soil Biol 42(4):219–229CrossRefGoogle Scholar
  31. Goldhammer T, Blodau C (2008) Desiccation and product accumulation constrain heterotrophic anaerobic respiration in peats of an ombrotrophic temperate bog. Soil Biol Biochem 40(8):2007–2015CrossRefGoogle Scholar
  32. Gorham E (1991) Northern peatlands: role in the carbon cycle and probable responses to climate warming. Ecol Appl 1:182–195Google Scholar
  33. Heal OW, Smith RAH (1978) Introduction and site description. In: Heal OW, Perkins DF (eds) Production ecology of British moors and montane grasslands. Springer, Berlin, pp 2–16CrossRefGoogle Scholar
  34. Heinemeyer A, Croft S, Garnett MH, Gloor E, Holden J, Lomas MR, Ineson P (2010) The MILLENNIA peat cohort model: predicting past, present and future soil carbon budgets and fluxes under changing climates in peatlands. Clim Res 45:207–226Google Scholar
  35. Hemond HF (1990) Acid neutralizing capacity, alkalinity, and acid-base status of natural-waters containing organic acids. Environ Sci Technol 24(10):1486–1489CrossRefGoogle Scholar
  36. Hope D, Billett MF, Cresser MS (1994) A review of the export of carbon in river water—fluxes and processes. Environ Pollut 84(3):301–324CrossRefGoogle Scholar
  37. Hruska J, Kram P, McDowell WH, Oulehle F (2009) Increased dissolved organic carbon (DOC) in Central European streams is driven by reductions in ionic strength rather than climate change or decreasing acidity. Environ Sci Technol 43(12):4320–4326CrossRefGoogle Scholar
  38. Hughes S, Freeman C, Reynolds B, Hudson JA (1998) The effects of increased drought frequency on sulphate and dissolved organic carbon in peatland dominated catchments. In: Lemmela R, Helenius N (eds) Proceedings of the second international conference on climate and water, vols 1–3, pp 311–319Google Scholar
  39. IPCC (2007) Climate exchange 2007: the physical science basis. Cambridge University Press, CambridgeGoogle Scholar
  40. Ise T, Dunn AL, Wofsy SC, Moorcroft PR (2008) High sensitivity of peat decomposition to climate change through water-table feedback. Nat Geosci 1(11):763–766CrossRefGoogle Scholar
  41. Jager DF, Wilmking M, Kukkonen JVK (2009) The influence of summer seasonal extremes on dissolved organic carbon export from a boreal peatland catchment: evidence from one dry and one wet growing season. Sci Total Environ 407(4):1373–1382CrossRefGoogle Scholar
  42. Kalbitz K, Schmerwitz J, Schwesig D, Matzner E (2003) Biodegradation of soil-derived dissolved organic matter as related to its properties. Geoderma 113(3–4):273–291CrossRefGoogle Scholar
  43. Knorr KH, Lischeid G, Blodau C (2009) Dynamics of redox processes in a minerotrophic fen exposed to a water table manipulation. Geoderma 153(3–4):379–392CrossRefGoogle Scholar
  44. Mitchell G, McDonald AT (1992) Discoloration of water by peat following induced drought and rainfall simulation. Water Res 26(3):321–326CrossRefGoogle Scholar
  45. Mulder J, Pijpers M, Christophersen N (1991) Water-flow paths and the spatial-distribution of soils and exchangeable cations in an acid-rain impacted and a pristine catchment in Norway. Water Resour Res 27(11):2919–2928CrossRefGoogle Scholar
  46. Neal C, Reynolds B, Robson AJ (1999) Acid neutralisation capacity measurements within natural waters: towards a standardised approach. Sci Total Environ 244:233–241CrossRefGoogle Scholar
  47. Pastor J, Solin J, Bridgham SD, Updegraff K, Harth C, Weishampel P, Dewey B (2003) Global warming and the export of dissolved organic carbon from boreal peatlands. Oikos 100(2):380–386CrossRefGoogle Scholar
  48. Patrick S, Waters D, Juggins S, Jenkins A (1991) The United Kingdom Acid Waters Monitoring Network: site descriptions and methodology report. ENSIS Ltd., LondonGoogle Scholar
  49. Preston MD, Eimers MC, Watmough SA (2011) Effect of moisture and temperature variation on DOC release from a peatland: conflicting results from laboratory, field and historical data analysis. Sci Total Environ 409(7):1235–1242CrossRefGoogle Scholar
  50. Schiff S, Aravena R, Mewhinney E, Elgood R, Warner B, Dillon P, Trumbore S (1998) Precambrian shield wetlands: hydrologic control of the sources and export of dissolved organic matter. Clim Change 40(2):167–188CrossRefGoogle Scholar
  51. Schindler DW, Curtis PJ, Bayley SE, Parker BR, Beaty KG, Stainton MP (1997) Climate-induced changes in the dissolved organic carbon budgets of boreal lakes. Biogeochemistry 36(1):9–28CrossRefGoogle Scholar
  52. Scott MJ, Jones MN, Woof C, Tipping E (1998) Concentrations and fluxes of dissolved organic carbon in drainage water from an upland peat system. Environ Int 24(5–6):537–546CrossRefGoogle Scholar
  53. Sowerby A, Emmett BA, Williams D, Beier C, Evans CD (2010) The response of dissolved organic carbon (DOC) and the ecosystem carbon balance to experimental drought in a temperate shrubland. Eur J Soil Sci 61(5):697–709CrossRefGoogle Scholar
  54. Sparks DL (2003) Environmental soil chemistry. Academic Press, San DiegoGoogle Scholar
  55. Strack M, Waddington JM, Bourbonniere RA, Buckton EL, Shaw K, Whittington P, Price JS (2008) Effect of water table drawdown on peatland dissolved organic carbon export and dynamics. Hydrol Process 22(17):3373–3385CrossRefGoogle Scholar
  56. Tallis JH (1994) Pool-and-hummock patterning in a southern Pennine blanket mire. 2. The formation and erosion of the pool system. J Ecol 82(4):789–803CrossRefGoogle Scholar
  57. Thacker SA, Tipping E, Gondar D, Baker A (2008) Functional properties of DOM in a stream draining blanket peat. Sci Total Environ 407(1):566–573CrossRefGoogle Scholar
  58. Thurman EM (1985) Organic geochemistry of natural waters. Kluwer, DordrechtCrossRefGoogle Scholar
  59. Tipping E, Woof C, Rigg E, Harrison AF, Ineson P, Taylor K, Benham D, Poskitt J, Rowland AP, Bol R, Harkness DD (1999) Climatic influences on the leaching of dissolved organic matter from upland UK Moorland soils, investigated by a field manipulation experiment. Environ Int 25(1):83–95CrossRefGoogle Scholar
  60. Tipping E, Smith EJ, Lawlor AJ, Hughes S, Stevens PA (2003) Predicting the release of metals from ombrotrophic peat due to drought-induced acidification. Environ Pollut 123(2):239–253CrossRefGoogle Scholar
  61. Toberman H, Freeman C, Artz RRE, Evans CD, Fenner N (2008) Impeded drainage stimulates extracellular phenol oxidase activity in riparian peat cores. Soil Use Manag 24(4):357–365CrossRefGoogle Scholar
  62. Waiser MJ (2006) Relationship between hydrological characteristics and dissolved organic carbon concentration and mass in northern prairie wetlands using a conservative tracer approach. J Geophys Res Biogeosci 111(G2):G02024CrossRefGoogle Scholar
  63. Watts CD, Naden PS, Machell J, Banks J (2001) Long term variation in water colour from Yorkshire catchments. Sci Total Environ 278(1–3):57–72Google Scholar
  64. Weishaar JL, Aiken GR, Bergamaschi BA, Fram MS, Fujii R, Mopper K (2003) Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon. Environ Sci Technol 37(20):4702–4708CrossRefGoogle Scholar
  65. Wickland KP, Neff JC, Aiken GR (2007) Dissolved organic carbon in Alaskan boreal forest: sources, chemical characteristics, and biodegradability. Ecosystems 10(8):1323–1340CrossRefGoogle Scholar
  66. Worrall F, Burt TP (2008) The effect of severe drought on the dissolved organic carbon (DOC) concentration and flux from British rivers. J Hydrol 361(3–4):262–274CrossRefGoogle Scholar
  67. Worrall F, Burt T, Shedden R (2003) Long term records of riverine dissolved organic matter. Biogeochemistry 64(2):165–178CrossRefGoogle Scholar
  68. Worrall F, Harriman R, Evans CD, Watts CD, Adamson J, Neal C, Tipping E, Burt T, Grieve I, Monteith D, Naden PS, Nisbet T, Reynolds B, Stevens P (2004) Trends in dissolved organic carbon in UK rivers and lakes. Biogeochemistry 70(3):369–402CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • J. M. Clark
    • 1
    • 2
    • 3
  • A. Heinemeyer
    • 4
  • P. Martin
    • 5
    • 6
  • S. H. Bottrell
    • 2
  1. 1.Soil Research Centre, Department of Geography and Environmental Science, School of Human and Environmental SciencesUniversity of ReadingReadingUK
  2. 2.School of Earth and Environment and School of GeographyUniversity of LeedsLeedsUK
  3. 3.Grantham Institute for Climate Change Fellow, Civil and Environmental EngineeringImperial College LondonLondonUK
  4. 4.Stockholm Environment Institute at the Environment Department and Centre for Terrestrial Carbon Dynamics (York-Centre)University of YorkYorkUK
  5. 5.Department of BiologyUniversity of YorkYorkUK
  6. 6.National Oceanography Centre, SouthamptonSouthamptonUK

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