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Global-change controls on soil-carbon accumulation and loss in coastal vegetated ecosystems

Abstract

Coastal seagrass, mangrove and salt-marsh ecosystems—also termed blue-carbon ecosystems—play an important role in the global carbon cycle. Much of the organic carbon they store rests in soils that have accumulated over thousands of years. Rapidly changing climate and environmental conditions, including sea-level rise, warming, eutrophication and landscape development, will impact decomposition and thus the global reservoir of blue soil organic carbon. Yet, it remains unclear how these disturbances will affect the key biogeochemical mechanisms controlling decomposition—mineral protection, redox zonation, water content and movement, and plant–microbe interactions. We assess the spatial and temporal scales over which decomposition mechanisms operate and how their effectiveness may change following disturbances. We suggest that better integration of decomposition mechanisms into blue-carbon models may improve predictions of soil organic carbon stores and facilitate incorporation of coastal vegetated ecosystems into global budgets and management tools.

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Fig. 1: Four key mechanisms affect blue SOC decomposition.
Fig. 2: Disturbances impact decomposition by changing environmental conditions.

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Acknowledgements

A.C.S. was supported by Woods Hole Sea Grant (NA14OAR4170104) and NOAA NSC (NA14NOS4190145); J.L.B. by a CAREER award from NSF DEB (1350491/1719446); E.A.C. by NSF-DEB 1556554; and C.S.H. by NSF OCE-1238212, NSF-OCE 1637630, NSF-OCE 12-37140 and NSF-OCE18-32178.

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A.C.S. conceived and wrote initial drafts. All authors contributed to idea development and manuscript writing and editing.

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Correspondence to Amanda C. Spivak.

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Spivak, A.C., Sanderman, J., Bowen, J.L. et al. Global-change controls on soil-carbon accumulation and loss in coastal vegetated ecosystems. Nat. Geosci. 12, 685–692 (2019). https://doi.org/10.1038/s41561-019-0435-2

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