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

The relevance of particulate organic carbon (POC) for carbon composition in the pore water of drained and rewetted fens of the 'Donauried' (South-Germany)

Biogeosci. Discuss. 5, 1615-1623 (2008)
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Numerous studies have dealt with carbon (C) concentrations in Histosols, but there are no studies quantifying the relative importance of all individual C components in pore waters. For this study, measurements were made of all the carbon components (i.e., particulate organic carbon, POC; dissolved organic carbon, DOC; dissolved inorganic carbon, DIC; dissolved methane, CH4) in the soil pore water of a calcareous fen 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 transfer in the soil profile ("C-Shuttles"). Consequently, it was concluded that POC is at least as important as DOC for internal soil C turnover. There is no reason to assume significant biochemical differences between POC and DOC as they only differ in size. Therefore, both POC and DOC fractions are essential components of C budgets of peatlands. Furthermore dissolved CO2 in all forms of DIC apparently is an important part of peatland C-balances.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
ISSN (print) / ISBN 1810-6277
e-ISSN 1810-6285
Zeitschrift Biogeosciences Discussions
Quellenangaben Band: 5, Heft: , Seiten: 1615-1623 Artikelnummer: , Supplement: ,
Verlag European Geosciences Union (EGU) ; Copernicus
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Soil Ecology (IBOE)