A global dataset of soil organic carbon accumulation rate in coastal ecosystems

Coastal ecosystems are increasingly recognized as a vital nature-based climate solution due to their exceptional capacity for carbon sequestration. However, the spatial distribution and quantification of soil organic carbon accumulation rate (OCAR) at the global scale remain limited. Here, we assemble an open global dataset of soil OCAR in coastal ecosystems from a systematic literature review. The dataset has 8,839 field observations reported in 247 peer-reviewed articles, encompassing four ecosystem types (mangroves, salt marshes, seagrasses, and tidal flats) and two measurement methods (Radiometric dating and Surface Elevation Table-Marker Horizon). Furthermore, the inherent information of the articles and the geographical information of the monitoring locations were included in the dataset. The dataset can be used to more accurately quantify and map global coastal soil carbon sequestration capacity, enabling the development of global spatial-temporal prediction models. This dataset serves as a vital scientific foundation for the management strategies of coastal ecosystems and future carbon credit markets.