b6e25e76-9f10-4e98-8ebd-5b528b2fd3e8 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-11-17T13:02:11 creation ISO 19115 2016 Tracing blue carbon flows across diverse seascapes b6e25e76-9f10-4e98-8ebd-5b528b2fd3e8 Abstract: Plants occupying coastal ecosystems draw in carbon dioxide (CO2) from the air and water around them during photosynthesis. A fraction of this CO2 becomes fixed into plant biomass and can eventually contribute to the blue carbon pool—organic carbon (Corg) sequestered in slow-turnover sinks. An important step in protecting and enhancing this natural carbon sequestration pathway is determining the relative contributions of different coastal plants to this blue carbon pool in durable sinks. We compiled a global dataset of coastal soil carbon measurements and used a Bayesian hierarchical meta-regression model to explore the relative contribution of local (autochthonous) versus external (allochthonous) sources of Corg in the soils beneath tidal saltmarsh, mangrove, and seagrass wetlands. We found most soil Corg in coastal wetlands came from allochthonous sources, rather than the habitat-forming plants. Managing climate-resilient blue carbon seascapes, therefore, requires an awareness of this portfolio of contributors to soil carbon sequestration. However, study design aspects such as soil sampling depth, levels of sample replication, and the modelling approach used to trace Corg can have pronounced effects on the estimated contributions of different carbon sources. We outline a roadmap for improving how we track the various drivers of soil carbon sequestration in diverse mosaics of coastal vegetation. {"type": "Polygon", "coordinates": [[[-142.31250643730166, -48.017059049132236], [197.2968685626984, -48.017059049132236], [197.2968685626984, 56.47306127513769], [-142.31250643730166, 56.47306127513769], [-142.31250643730166, -48.017059049132236]]]} -142.31250643730166 197.2968685626984 -48.017059049132236 56.47306127513769 Fulton_etal_BlueCarbonTracingSupp2 Data documentDigital Fulton_etal_BlueCarbonTracingSupp2 Data XLSX AIMS Web Site documentDigital HTML AIMS Web Site documentDigital HTML AIMS Web Site documentDigital HTML AIMS Web Site documentDigital HTML Unnamed resource documentDigital License Graphic PNG Unnamed resource documentDigital HTML