Soil carbon in the world’s tidal marshes

Tania L. Maxwell (), Mark D. Spalding, Daniel A. Friess, Nicholas J. Murray, Kerrylee Rogers, Andre S. Rovai, Lindsey S. Smart, Lukas Weilguny, Maria Fernanda Adame, Janine B. Adams, William E. N. Austin, Margareth S. Copertino, Grace M. Cott, Micheli Duarte de Paula Costa, James R. Holmquist, Cai J. T. Ladd, Catherine E. Lovelock, Marvin Ludwig, Monica M. Moritsch, Alejandro Navarro, Jacqueline L. Raw, Ana-Carolina Ruiz-Fernández, Oscar Serrano, Craig Smeaton, Marijn Broek, Lisamarie Windham-Myers, Emily Landis and Thomas A. Worthington ()
Additional contact information
Tania L. Maxwell: University of Cambridge
Mark D. Spalding: University of Cambridge
Daniel A. Friess: Tulane University
Nicholas J. Murray: James Cook University
Kerrylee Rogers: University of Wollongong
Andre S. Rovai: U.S. Army Engineer Research and Development Center
Lindsey S. Smart: The Nature Conservancy
Lukas Weilguny: Wellcome Genome Campus
Maria Fernanda Adame: Griffith University
Janine B. Adams: Nelson Mandela University
William E. N. Austin: University of St Andrews
Margareth S. Copertino: Federal University of Rio Grande (FURG)
Grace M. Cott: University College Dublin
Micheli Duarte de Paula Costa: Deakin University
James R. Holmquist: Smithsonian Environmental Research Center
Cai J. T. Ladd: Swansea University
Catherine E. Lovelock: The University of Queensland
Marvin Ludwig: University of Münster
Monica M. Moritsch: Santa Cruz
Alejandro Navarro: James Cook University
Jacqueline L. Raw: Nelson Mandela University
Ana-Carolina Ruiz-Fernández: Unidad Académica Mazatlán
Oscar Serrano: Centro de Estudios Avanzados de Blanes (CEAB)
Craig Smeaton: University of St Andrews
Marijn Broek: Swiss Federal Institute of Technology (ETH Zürich)
Lisamarie Windham-Myers: California Delta Stewardship Council
Emily Landis: The Nature Conservancy
Thomas A. Worthington: University of Cambridge

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract Tidal marshes are threatened coastal ecosystems known for their capacity to store large amounts of carbon in their water-logged soils. Accurate quantification and mapping of global tidal marshes soil organic carbon (SOC) stocks is of considerable value to conservation efforts. Here, we used training data from 3710 unique locations, landscape-level environmental drivers and a global tidal marsh extent map to produce a global, spatially explicit map of SOC storage in tidal marshes at 30 m resolution. Here we show the total global SOC stock to 1 m to be 1.44 Pg C, with a third of this value stored in the United States of America. On average, SOC in tidal marshes’ 0–30 and 30–100 cm soil layers are estimated at 83.1 Mg C ha−1 (average predicted error 44.8 Mg C ha−1) and 185.3 Mg C ha−1 (average predicted error 105.7 Mg C ha−1), respectively.

Date: 2024
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DOI: 10.1038/s41467-024-54572-9

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