Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change

Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change Francisco Ruiz, Angelo Bernardino, Hermano Queiroz, Xosé Luis Otero, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4650556/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 30 Nov, 2024 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Abstract Mangroves are coastal hotspots for carbon storage and yet face multiple threats from anthropogenic activities. Here we explore the role of Fe-mediated organomineral interactions (FeOMI) in soil organic carbon (SOC) stabilization and its sensitivity to land use change (LUC) in Amazonian mangroves. First, we show that the poorly crystalline Fe oxides represent the most effective Fe phase for retaining SOC in pristine mangroves. Contrary to prevailing assumptions about high stability induced by FeOMI, thermal analysis revealed an increase in organic matter stability after Fe removal from samples. The results thus indicate that Fe protects more labile SOC fractions, otherwise vulnerable to biological degradation. Despite the fragile equilibrium of FeOMI under dynamic redox conditions in mangroves, this balance sustains a substantial pool of labile SOC (approximately 8% of total SOC). The studied LUC scenario led to massive loss of Fe-bound OC as less crystalline phases were either degraded or transformed into more crystalline ones, losing the efficiency in retaining SOC. We show that the conversion of mangroves to pastures and shrimp ponds, which are pervasive globally, trigger important biogeochemical changes driving SOC persistence, and therefore have major implications for the intended restoration and carbon capture in mangroves areas formerly disturbed. Earth and environmental sciences/Biogeochemistry/Carbon cycle Earth and environmental sciences/Environmental sciences/Environmental chemistry/Geochemistry Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementarymaterialFeOMI.docx Cite Share Download PDF Status: Published Journal Publication published 30 Nov, 2024 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4650556","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":320325998,"identity":"4936e219-59ea-48de-85a1-cc8f7dfd02cd","order_by":0,"name":"Francisco Ruiz","email":"","orcid":"https://orcid.org/0000-0002-2651-9033","institution":"ESALQ - University of São Paulo","correspondingAuthor":false,"prefix":"","firstName":"Francisco","middleName":"","lastName":"Ruiz","suffix":""},{"id":320325999,"identity":"44d00465-7db8-4fe5-81ce-dbbe6492e854","order_by":1,"name":"Angelo 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