PuSH - Publication Server of Helmholtz Zentrum München: Particulate organic carbon (POC) in relation to other pore water carbon fractions in drained and rewetted fens in Southern Germany.

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Fiedler, S.* ; Höll, S.* ; Freibauer, A.* ; Stahr, K.* ; Drösler, M.* ; Schloter, M. ; Jungkunst, H.F.*

Particulate organic carbon (POC) in relation to other pore water carbon fractions in drained and rewetted fens in Southern Germany.

Biogeosciences 5, 1615-1623 (2008)

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Numerous studies have dealt with carbon (C) contents in Histosols, but there are no studies quantifying the relative importance of the individual C components in pore waters. For this study, measurements were taken of all the carbon components (particulate organic carbon, POC; dissolved organic carbon, DOC; dissolved inorganic carbon, DIC; dissolved methane, CH4) in the soil pore water of calcareous fens under three different water management regimes (re-wetted, deeply and moderately drained). Pore water was collected weekly or biweekly (April 2004 to April 2006) at depths between 10 and 150 cm. The main results obtained were: (1) DIC (94–280 mg C l-1) was the main C-component. (2) POC and DOC concentrations in the pore water (14–125 mg C l-1 vs. 41–95 mg C l-1) were pari passu. (3) Dissolved CH4 was the smallest C component (0.005–0.9 mg C l-1). Interestingly, about 30% of the POM particles were colonized by microbes indicating that they are active in the internal C turnover. Certainly, both POC and DOC fractions are essential components of the C budget of peatlands. Furthermore, dissolved CO2 in all forms of DIC appears to be an important part of peatland C-balance.

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