TY - JOUR T1 - Soil Organic Carbon Development and Turnover in Natural and Disturbed Salt Marsh Environments JF - Geophysical Research Letters Y1 - 2021 A1 - Luk, Sheron Y. A1 - Todd‐Brown, Katherine A1 - Eagle, Meagan A1 - McNichol, Ann P. A1 - Sanderman, Jonathan A1 - Gosselin, Kelsey A1 - Spivak, Amanda C. AB - Salt marsh survival with sea-level rise (SLR) increasingly relies on soil organic carbon (SOC) accumulation and preservation. Using a novel combination of geochemical approaches, we characterized fine SOC (≤1 mm) supporting marsh elevation maintenance. Overlaying thermal reactivity, source (δ13C), and age (F14C) information demonstrates several processes contributing to soil development: marsh grass production, redeposition of eroded material, and microbial reworking. Redeposition of old carbon, likely from creekbanks, represented ∼9%–17% of shallow SOC (≤26 cm). Soils stored marsh grass-derived compounds with a range of reactivities that were reworked over centuries-to-millennia. Decomposition decreases SOC thermal reactivity throughout the soil column while the decades-long disturbance of ponding accelerated this shift in surface horizons. Empirically derived estimates of SOC turnover based on geochemical composition spanned a wide range (640–9,951 years) and have the potential to inform predictions of marsh ecosystem evolution. VL - 48 UR - https://onlinelibrary.wiley.com/doi/10.1029/2020GL090287 IS - 2 ER -