Great thanks for this. I also found some articles which have tried it:

Journal of Soil Science, 1992,43,341-358

Composition of carbon fractions and potential

denitrification in drained peat soils

R. G. JoRGENSEN& G. M. RICHTER*

Turk J Agric For

34 (2010) 245-256

© TÜBİTAK

doi:10.3906/tar-0905-33

Transformation of some organic matter components in organic

soils exposed to drainage

Barbara KALISZ1,*, Andrzej LACHACZ1, Roman GLAZEWSKI2

It might be worthwhile to consider partcile-size separation as described by Caroline Preston and coworkers ( C-13 NMR AND CHEMICAL CHARACTERIZATION OF PARTICLE-SIZE SEPARATES OF PEATS DIFFERING IN DEGREE OF DECOMPOSITION; ORGANIC GEOCHEMISTRY 14, 393-403; 1989)

During the last years we tried to apply a P fractionation method developed for peat soils to quantify also the amount of potential mobilisable organic matter (see Cabezas, A., Gelbrecht, J., and Zak, D.(2013) The effect of rewetting drained fens with

nitrate polluted water on dissolved organic carbon and phosphorus release. Ecological Engineering, 53, 79-88. or Zak, D. and Gelbrecht, J. (2007) The mobilization of phosphorus, organic carbon and ammonium in the initial stage of fen rewetting (a case study from NE Germany). – Biogeochemistry 85,141-151). Additionally we did just some DOM flux measurements and found that they were correlated significantly with DOM bound to redox-sensitive compounds such as Fe(III)-hydroxides. Interestingly high DOM-fluxes in water saturated peat soils were not significantly correlated to methane emissions (however it is not published yet). So, it would be really interesting to combine former mentioned extraction methods with methods on OM quality (Fluoroscence, Liquid chromatogarphy, infrared spectroscopy etc.)