IDEAS home Printed from https://ideas.repec.org/a/eee/ecomod/v386y2018icp59-70.html
   My bibliography  Save this article

Dynamic isotope equations for 13CH4 and 13CO2 describing methane formation with a focus on the effect of anaerobic respiration in sediments of some tropical lakes

Author

Listed:
  • Vavilin, Vasily
  • Rytov, Sergey
  • Lokshina, Lyudmila

Abstract

The production of CO2 during sediment decomposition in field and laboratory incubations is often reported to be higher than that of CH4. We present a mathematical description of cellulose conversion into methane and carbon dioxide in the anoxic sediments of tropical Ladario and Belmont Lakes, which were investigated before. The processes of anaerobic respiration and acidogenesis competing for cellulose monomer, as well as the processes of anaerobic respiration, acetoclastic methanogenesis, and syntrophic acetate oxidation, competing for acetate, are considered. The gaseous and dissolved H2, CO2, and CH4 are taken into account in dynamic equations for total 12C+13C and 13C carbon in CH4 and CO2. Considering the amounts of CH4 and CO2 produced during the batch tests and changes in their carbon isotope values, modelling based on balances of summary total 12C+13C and 13C carbon is used to adequately describe the experimental data on sediment methanization. The high CO2:CH4 ratio with a delay in methane production observed in the batch experiments is interpreted by the model as due to an initial Fe3+ reduction. The model is validated by describing the system's dynamics under strong inhibition of acetoclastic methanogenesis by methyl fluoride. For comparison, the model is used to show a standard pathway of cellulose methanization in the tropical Anzol de Ouro Lake with a 1:1 ratio of produced CO2 to CH4, in conditions in which anaerobic respiration was proved to be insignificant.

Suggested Citation

  • Vavilin, Vasily & Rytov, Sergey & Lokshina, Lyudmila, 2018. "Dynamic isotope equations for 13CH4 and 13CO2 describing methane formation with a focus on the effect of anaerobic respiration in sediments of some tropical lakes," Ecological Modelling, Elsevier, vol. 386(C), pages 59-70.
    • Handle: RePEc:eee:ecomod:v:386:y:2018:i:c:p:59-70
    DOI: 10.1016/j.ecolmodel.2018.08.005
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0304380018302680
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.ecolmodel.2018.08.005?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Vavilin, V.A., 2012. "Estimating evolution of δ13CH4 during methanogenesis in the boreal peatland ecosystems based on stoichiometric chemical reactions, microbial dynamics and stable carbon isotope fractionation," Ecological Modelling, Elsevier, vol. 240(C), pages 84-92.
    2. Vavilin, Vasily & Rytov, Sergey & Conrad, Ralf, 2017. "Modelling methane formation in sediments of tropical lakes focusing on syntrophic acetate oxidation: Dynamic and static carbon isotope equations," Ecological Modelling, Elsevier, vol. 363(C), pages 81-95.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Vavilin, V.A. & Rytov, S.V. & Lokshina, L.Y., 2014. "Non-linear dynamics of nitrogen isotopic signature based on biological kinetic model of uptake and assimilation of ammonium, nitrate and urea by a marine diatom," Ecological Modelling, Elsevier, vol. 279(C), pages 45-53.
    2. Vavilin, Vasily & Rytov, Sergey & Conrad, Ralf, 2017. "Modelling methane formation in sediments of tropical lakes focusing on syntrophic acetate oxidation: Dynamic and static carbon isotope equations," Ecological Modelling, Elsevier, vol. 363(C), pages 81-95.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:ecomod:v:386:y:2018:i:c:p:59-70. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/ecological-modelling .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.