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Carbon cycling potential from Utricularia breviscapa decomposition in a tropical oxbow lake (São Paulo, Brazil)

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  • da Cunha Santino, Marcela Bianchessi
  • Bianchini, Irineu

Abstract

The rate of decomposition of aquatic macrophytes is controlled by environmental factors such as temperature and oxygen availability. Laboratory assays were carried out to evaluate the decomposition rates of Utricularia breviscapa under controlled conditions of dissolved oxygen and temperature. Measured decomposition rates were then used in model simulations of expected decomposition rates using field collected monthly temperature and dissolved oxygen measures. The incubations were comprised of U. breviscapa detritus added to Óleo Lagoon water under aerobic and anaerobic conditions at 15.3°C, 20.8°C, 25.7°C and 30.3°C in the dark. Mass loss and leachate formation were monitored over 180 days. Overall, the decomposition process was faster under aerobic than anaerobic conditions and by increasing at higher temperature. Considering the seasonal changes of temperature and oxygen availability of Óleo Lagoon, the simulated values of mineralization rates of dissolved organic carbon (DOC) and refractory particulate organic carbon (POCR) suggest faster carbon cycling in November. Based on these simulations, in the cold months (June and July) the DOC and COPR mineralization processes were 22% and 25% lower than in the warmer months (October and November), respectively. On average, the DOC mineralization process was 3.7 times faster than POCR.

Suggested Citation

  • da Cunha Santino, Marcela Bianchessi & Bianchini, Irineu, 2008. "Carbon cycling potential from Utricularia breviscapa decomposition in a tropical oxbow lake (São Paulo, Brazil)," Ecological Modelling, Elsevier, vol. 218(3), pages 375-382.
    • Handle: RePEc:eee:ecomod:v:218:y:2008:i:3:p:375-382
    DOI: 10.1016/j.ecolmodel.2008.07.023
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    References listed on IDEAS

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    1. Cambier, C. & Bousso, M. & Masse, D. & Perrier, E., 2007. "A new, offer versus demand, modelling approach to assess the impact of micro-organisms spatio-temporal population dynamics on soil organic matter decomposition rates," Ecological Modelling, Elsevier, vol. 209(2), pages 301-313.
    2. Schultz, Patrick & Urban, Noel R., 2008. "Effects of bacterial dynamics on organic matter decomposition and nutrient release from sediments: A modeling study," Ecological Modelling, Elsevier, vol. 210(1), pages 1-14.
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    Cited by:

    1. Bianchini, Irineu & da Cunha Santino, Marcela Bianchessi, 2011. "Model parameterization for aerobic decomposition of plant resources drowned during man-made lakes formation," Ecological Modelling, Elsevier, vol. 222(7), pages 1263-1271.
    2. Li, Xia & Cui, Baoshan & Yang, Qichun & Lan, Yan & Wang, Tingting & Han, Zhen, 2013. "Effects of plant species on macrophyte decomposition under three nutrient conditions in a eutrophic shallow lake, North China," Ecological Modelling, Elsevier, vol. 252(C), pages 121-128.

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