Maxwell, Tania L., Spalding, Mark D., Friess, Daniel A., Murray, Nicholas J., Rogers, Kerrylee, Rovai, Andre S., Smart, Lindsey, Weilguny, Lukas, Adame, Maria Fernanda, Adams, Janine B., Austin, William E.N., Copertino, Margareth S., Cott, Grace M., Duarte de Paula Costa, Micheli, Holmquist, James R., Ladd, Cai J.T., Lovelock, Catherine, Ludwig, Marvin, Moritsch, Monica M., Navarro Otero, Alejandro, Raw, Jacqueline L., Ruiz-Fernández, Ana-Carolina, Serrano, Oscar, Smeaton, Craig, Van de Broek, Marijn, Windham-Myers, Lisamarie, Landis, Emily, and Worthington, Thomas A. (2024) Soil carbon in the world’s tidal marshes. Nature Communications, 15. 10265.

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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.

Item ID:	84877
Item Type:	Article (Research - C1)
ISSN:	2041-1723
Copyright Information:	This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Date Deposited:	13 Mar 2025 00:47
FoR Codes:	31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 30% 41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410101 Carbon sequestration science @ 70%
SEO Codes:	19 ENVIRONMENTAL POLICY, CLIMATE CHANGE AND NATURAL HAZARDS > 1903 Mitigation of climate change > 190301 Climate change mitigation strategies @ 60% 18 ENVIRONMENTAL MANAGEMENT > 1802 Coastal and estuarine systems and management > 180201 Assessment and management of coastal and estuarine ecosystems @ 40%
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