Aim: Coastal wetlands provide critical ecosystem functions and services, e.g. coastal protection, nutrient retention and C sequestration. Despite the important roles in global C, N and P cycling, the global variation in leaf stoichiometry across coastal wetlands remains unclear. Location: Global. Time period: 1980-2018. Major taxa studied: Vascular plants. Methods: By compiling a global dataset of 698 data records in 205 sites, we systematically analysed the world-wide trends and their determinants in leaf element contents...