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Ecosystem engineering by large grazers enhances carbon stocks in a tidal salt marsh

Elschot, K., Bakker, J. P., Temmerman, S., van de Koppel, J. & Bouma, T. J., 14-Oct-2015, In : Marine Ecology Progress Series. 537, p. 9-21 13 p.

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  • Ecosystem engineering by large grazers enhances carbon stocks in a tidal salt marsh

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DOI

Grazers can have a large impact on ecosystem processes and are known to change vegetation composition. However, knowledge of how the long-term presence of grazers affects soil carbon sequestration is limited. In this study, we estimated total accumulated organic carbon in soils of a back-barrier salt marsh and determined how this is affected by long-term grazing by both small and large grazers in relation to age of the ecosystem. In young marshes, where small grazers predominate, hare and geese have a limited effect on total accumulated organic carbon. In older, mature marshes, where large grazers predominate, cattle substantially enhanced carbon content in the marsh soil. We ascribe this to a shift in biomass distribution in the local vegetation towards the roots in combination with trampling effects on the soil chemistry. These large grazers thus act as ecosystem engineers: their known effect on soil compaction (based on a previous study) enhances anoxic conditions in the marsh soil, thereby reducing the oxygen available for organic carbon decomposition by the local microbial community. This study showed that the indirect effects of grazing can significantly enhance soil carbon storage through changing soil abiotic conditions. This process should be taken into account when estimating the role of ecosystems in reducing carbon dioxide concentration in the atmosphere. Ultimately, we propose a testable conceptual framework that includes 3 pathways by which grazers can alter carbon storage: (1) through above-ground biomass removal, (2) through alteration of biomass distribution towards the roots and/or (3) by changing soil abiotic conditions that affect decomposition.

Original languageEnglish
Pages (from-to)9-21
Number of pages13
JournalMarine Ecology Progress Series
Volume537
Publication statusPublished - 14-Oct-2015

    Keywords

  • Carbon sequestration, Climate change, Coastal wetland, Grazing, Redox potential, Soil compaction, Succession, SEA-LEVEL RISE, CLIMATE-CHANGE, PRODUCTIVITY GRADIENT, VEGETATION SUCCESSION, REDOX OSCILLATION, ORGANIC-MATTER, WETLAND SOILS, WADDEN SEA, NORTH-SEA, IMPACT

ID: 32418877