Seagrass litter is a crucial autochthonous source of sediment organic carbon (C org ) that contributes to C org storage in coastal ecosystems. However, our understanding of seagrass litter decomposition effects on sediment C org sequestration and the factors influencing the capacity for autochthonous carbon sequestration remains limited. We investigated Zostera marina litter decomposition dynamics in eelgrass meadows along the...