Methane dynamics of Eurasian peatlands: Environmental controls on linear and non-linear pathways of CH4 emissions

• Antragsteller: Professor Martin Wilmking, Ph.D.
• Fachliche Zuordnung: Physische Geographie
• Förderung: Förderung von 2007 bis 2014
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 24797238

• Erstellungsjahr: 2016

Zusammenfassung der Projektergebnisse

Zwei Messfelder in borealen Mooren wurden betrieben, Salmisuo, Finnland, und Ust-Pojeg, Russland. Auf beiden Messfeldern wurden Eddy Kovarianzanlagen mit Kammermessungen zu Methanemissionen verschnitten, über hochaufgelöste Luftbilder und Vegetationskartierungen hochskaliert und mit mechanistischen Modellen verglichen. Teilweise erhebliche Abweichungen deuteten auf methodische Probleme hin, die in der Gruppe insbesondere in Bezug auf 1) Nichtlineare vs. lineare Regressionsmodelle in der Emissionsberechnung; 2) Vergleich Kammer – Eddy-Kovarianzmessverfahren in der Aufskalierung,; und 3) Einfluss der Messzeiten (Tag oder Nacht) und kurzfristigen Ereignisse auf die Emissionsdynamik untersucht und veröffentlicht wurden. Insgesamt wurden die Ergebnisse der Emmy Noether Gruppe in 18 ISI-Publikationen und mehr als 20 Konferenzbeiträgen veröffentlicht, ein Kurzbericht lief im Wissenschaftsmagazin „Nano“ von 3sat.

Projektbezogene Publikationen (Auswahl)

• (2007): CO2 flux determination by closed-chamber methods can be seriously biased by inappropriate application of linear regression. Biogeosciences 4(6): 1005–1025
  Kutzbach, L., Schneider, J., Sachs, T., Giebels, M., Nykänen, H., Shurpali, N.J., Martikainen, P.J., Alm, J. & M. Wilmking
  
• (2008): Do we miss the hot spots? – The use of very high resolution aerial photographs to quantify carbon fluxes in peatlands. Biogeosciences 5: 1387–1393
  Becker, T., Kutzbach, L., Forbrich, I., Schneider, J., Jager, D., Thees, B. & M. Wilmking
  
• (2009): Overestimation of CO2 respiration fluxes by the closed chamber method in low-turbulence nighttime conditions. Journal of Geophysical Research 114, G03005
  Schneider, J., Kutzbach, L., Schulz, S. & M. Wilmking
  
• (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. Science of the Total Environment 407(4): 1373–1382
  Jager, D.F., Wilmking, M. & J.V.K. Kukkonen
  
• (2010): A comparison of linear and exponential regression for estimating diffusive CH4 fluxes by closed-chamber in peatlands. Soil Biology and Biochemistry 42(3): 507–515
  Forbrich, I., Hormann, A., Kutzbach, L. & M. Wilmking
  
• (2010): Diurnal dynamics of CH4 from a boreal peatland during snowmelt. Tellus B 62(3): 133–139
  Gazovic, M., Kutzbach, L., Schreiber, P., Wille, C. & M. Wilmking
  
• (2010): Evapotranspiration dynamics in a boreal peatland and its impact on the water and energy balance. Journal of Geophysical Research 115, G04038
  Wu, J., Kutzbach, L., Jager, D., Wille, C. & M. Wilmking
  
• (2011): Cross-evaluation of measurements of peatland methane emissions on microform and ecosystem scales using highresolution landcover classification and source weight modeling. Agricultural and Forest Meteorology 151(7): 864–874
  Forbrich, I., Kutzbach, L., Wille, C., Becker, T., Wu, J. & M. Wilmking
  
• (2011): Identification of linear relationships from noisy data using errors-in-variables models – relevance for reconstruction of past climate from tree-ring (and other) proxy information. Climatic Change 105 (1-2): 155–177
  Kutzbach, L., Thees, B. & M. Wilmking
  
• (2011): Plant-mediated CH4 transport and contribution of photosynthates to methanogenesis at a boreal mire: a 14C pulse-labeling study. Biogeosciences 8(8): 2365–2375
  Dorodnikov, M., Knorr, K., Kuzyakov, Y. & M. Wilmking
  
• (2012): Carbon dioxide exchange fluxes of a boreal peatland over a complete growing season, Komi Republic, NW Russia. Biogeochemistry 111: 485–513
  Schneider, J., Kutzbach, L. & M. Wilmking
  
• (2012): Continuously missing outer rings in woody plants at their distributional margins. Dendrochronologia 30(3): 213–222
  Wilmking, M., Hallinger, M., Van Bogaert, R., Kyncl, T., Babst, F., Hahne, W., Juday, G., de Luis, M., Novak, K. & C. Völlm
  
• (2013): Effect of microtopography on isotopic composition of methane in porewater and efflux at a boreal peatland. Boreal Environment Research 18: 269–279
  Dorodnikov, M., Marushchak, M., Biasi, C., Wilmking, M.
  
• (2013): Hydrology driven ecosystem respiration determines the carbon balance of a boreal peatland. Science of the Total Environment 463-464: 675–682
  Gazovic, M., Forbrich, I., Jager, D., Kutzbach, L., Wille, C. & M. Wilmking
  
• (2014): A synthesis of methane emissions from 71 northern, temperate, and subtropical wetlands. Global Change Biology
  Turetsky, M.R., Kotowska, A., Bubier, J., Dise, N.B., Crill, P., Hornibrook, E., Minkinnen, K., Moore, T.R., Myers-Smith, I.H., Nykänen, H., Olefeldt, D., Rinne, J., Saarnio, S., Shurpali, N., Waddington, J.M., White, J., Wickland K. & M. Wilmking
  
• (2014): Peatland pines as a proxy for water table fluctuations: Disentangling tree growth, hydrology and possible human influence. Science of the Total Environment 500–501 (2014) 52–63
  Smiljanic, M., Seo, J.W., Länelaid, A., van der Maaten-Theunissen, M., Stajic B., Wilmking, M.
  
• (2014): The surface energy balance and its drivers in a boreal peatland fen of northwestern Russia. Journal of Hydrology 511: 359–373
  Runkle, B.R.K., Wille, C., Gazovic, M., Wilmking, M. & L. Kutzbach
  
• (2016): Russian boreal peatlands dominate the natural European methane budget. Environmental Research Letters, 11(1):1-7
  Schneider, J., Jungkunst, H., Wolf, U., Schreiber, P. Gazovic, M., Miglovets, M., Mikhaylov, O., Grunwald, D., Erasmi, S., Wilmking, M., Kutzbach, L.
  
• Growth characteristics of coniferous trees growing on a boreal peatland and their application as markers for dating recent peat deposits, S. 47-62, chapter 6 in book: Zagirova s., Schneider J. Ecosystem of a mesooligotrophic peatland in northwestern Russia: development, structure, and function. Publisher: Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, UNPD, Syktyvkar 2016. ISBN 978-5-89606-562-3
  Bärisch, S., Wilmking, M.