Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir

Abstract 2. In this study, we investigated various phases of OM including DOC, autochthonous particulate organic carbon (auto-POC), allochthonous particulate organic carbon (allo-POC), and sedimentary matter (SED) in a temperate drinking water reservoir (Rappbode Reservoir, Germany) by means of dissolved inorganic carbon (DIC) concentrations and carbon stable isotope ratios. In order to best outline carbon turnover, we focused on the metalimnion and the hypolimnion of the reservoir, where respiration is expected to be dominant and hardly disturbed by atmospheric exchange or photosynthesis. DIC concentrations ranged between 0.30 and 0.53 mmol L- 1 δ 13 DIC values ranged between - - δ 13 DOC and δ 13 auto-POC ranged between - - - - δ 13 SED = - 31.1  ‰ and δ 13 allo-POC ranging from - - µ mol L- 1 - 1) were within the range for oligotrophic water bodies. Some higher values in the metalimnion are likely due to increased availability of settling auto-POC from the photic zone. Samples from a metalimnetic oxygen minimum (MOM) also showed dominance of respiration over photosynthesis. Our work shows that respiration in temperate lentic water bodies largely depends on auto-POC production as a major carbon source. Such dependencies can influence the vulnerabilities of these aqueous systems.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir ; volume:19 ; number:22 ; year:2022 ; pages:5343-5355 ; extent:13 ; Biogeosciences ; 19, Heft 22 (2022), 5343-5355 (gesamt 13)

Contributors, Places and Time

• Creator: Dordoni, Marlene ; Seewald, Michael ; Rinke, Karsten ; Friese, Kurt ; van Geldern, Robert ; Schmidmeier, Jakob ; Barth, Johannes A. C.

Further information

• DOI: 10.5194/bg-19-5343-2022
• URN: urn:nbn:de:101:1-2022120104251615973867
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:36 AM CEST