Sedimentation and breakdown kinetics of organic matter in the anaerobic zone of Lake Vechten |
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Authors: | Th E Cappenberg H Verdouw |
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Institution: | (1) Limnological Institute, Vijverhof Laboratory, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands |
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Abstract: | The turnover and exchange rates, as well as the sedimentation rates concerning the input and output of carbon in the anaerobic hypolimnion and the sediment in Lake Vechten were studied. The carbon input data were derived from those on sedimentation. By comparison of C-fixation data, sedimentation rates measurements and microbial reduction rates of observed fluxes of electron acceptors a mineralization of 20–30% of the limnetic C-fixation was found in the hypolimnion. The rate-limiting step of methanogenesis in anaerobic mineralization is the breakdown of algal cell wall components to their main product, namely acetate. This intermediate has a relatively fast turnover rate to the end-products, namely the gases CH4 and CO2. Finally, from the data on the diffusion of low-molecular weight metabolic intermediates and on the rates of formation of CH4 and CO2 the output of carbon and its cycling in Lake Vechten are discussed. |
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Keywords: | sedimentation rates turnover rates carbon recycling anaerobic mineralization |
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