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Decomposition dynamics of two aquatic macrophytes: response of litter interaction with temperature and dissolved oxygen availability

  • Ecology & Biogeography - Original Article
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Abstract

The decomposition of a single macrophytes species may not represent entirely the carbon cycling in aquatic ecosystems, as in the freshwater macrophyte-dominant environments several species grow and decay concomitantly. To assess the interaction of the two species in the decomposition process, the temporal variation of particulate organic carbon (POC) of Hedychium coronarium J. König, Typha domingensis Persoon and the mixed sample (50% of each species) was mathematically modeled. Kinetic models were used to verify the temperature and the availability of dissolved oxygen, as regulating factors in decomposition. The aerobic processes favored a faster decay when compared to anaerobic processes. The occurrence of two phases in decomposition was observed: (1) with a rapid mass loss (POCLS) and (2) with a slow degradation (POCR). During the aerobic decomposition, independently of variation in temperature, the effect was always antagonistic. However, under anaerobic conditions, the three types were observed (antagonistic, additive and synergic). The mixed detritus always displayed the highest Q10 coefficient. Modeling mixed detritus decomposition was a reliable predictive framework of litter decomposition at a ecosystemic scale, improving ecosystem response of carbon cycling feedback under an increasing temperature.

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Acknowledgements

The authors would like to thank the research funding agencies CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the scholarships granted in the postgraduate student participating in the study and FAPESP (Fundação de Amparo a Pesquisa do Estado de São Paulo; Process Number 13/22901-0) for financial support.

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All authors contributed to the study conception and design. YCP did the material preparation, investigation, collected data, and wrote the manuscript. IB and MBCS provided funding, supervised the project, and wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Irineu Bianchini Jr. or Marcela Bianchessi da Cunha-Santino.

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Paccagnella, Y.C., Bianchini, I. & da Cunha-Santino, M.B. Decomposition dynamics of two aquatic macrophytes: response of litter interaction with temperature and dissolved oxygen availability. Braz. J. Bot 43, 1047–1059 (2020). https://doi.org/10.1007/s40415-020-00643-2

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  • DOI: https://doi.org/10.1007/s40415-020-00643-2

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