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OMDY: a new model of organic matter decomposition based on biomolecular content as assessed by 13C-CPMAS-NMR

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Abstract

Background and Aims

Modelling organic matter decomposition is fundamental to understand biogeochemical cycling in terrestrial ecosystems. Current models use C/N or Lignin/N ratios to describe susceptibility to decomposition, or implement separate C pools decaying with different rates, disregarding biomolecular transformations and interactions and their effect on decomposition dynamics. We present a new process-based model of decomposition including a description of biomolecular dynamics obtained by 13C-CPMAS NMR spectroscopy.

Methods

Baseline decay rates for relevant molecular classes and intermolecular protection were calibrated by best fitting of experimental data from leaves of 20 plant species decomposing for 180 days in controlled optimal conditions. The model was validated against field data from leaves of 32 plant species decomposing for 1-year at four sites in Mediterranean ecosystems.

Results

Simulations correctly reproduced mass loss data and variations of selected molecular classes both in controlled conditions and in the field, for a wide range of plant molecular composition and environmental conditions.

Conclusions

Our innovative approach accurately predicted decomposition of a wide range of litters across different climates. Prediction accuracy emerged from the species-specific partitioning of molecular types and from the representation of intermolecular interactions. Further application should be planned in other ecosystems based on long-term decomposition datasets.

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Acknowledgments

This work was funded by the Italian Ministry of Scientific Research and University (MIUR) within the FISR program (project MESCOSAGR, coordinator prof. A. Piccolo).

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Authors and Affiliations

  1. Dipartimento di Agraria, Università di Napoli Federico II, via Università 100, 80055, Portici, NA, Italy

    Guido Incerti, Giuliano Bonanomi, Francesco Giannino, Fabrizio Cartenì, Riccardo Spaccini, Alessandro Piccolo & Stefano Mazzoleni

  2. Centro Interdipartimentale di Ricerca CERMANU, Università di Napoli Federico II, via Università 100, 80055, Portici, NA, Italy

    Riccardo Spaccini, Pierluigi Mazzei & Alessandro Piccolo

Authors
  1. Guido Incerti
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  2. Giuliano Bonanomi
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  3. Francesco Giannino
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  4. Fabrizio Cartenì
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  5. Riccardo Spaccini
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  6. Pierluigi Mazzei
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  7. Alessandro Piccolo
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  8. Stefano Mazzoleni
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Correspondence to Stefano Mazzoleni.

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Incerti, G., Bonanomi, G., Giannino, F. et al. OMDY: a new model of organic matter decomposition based on biomolecular content as assessed by 13C-CPMAS-NMR. Plant Soil 411, 377–394 (2017). https://doi.org/10.1007/s11104-016-3039-2

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