g., temperature, oxygen conditions and current speed. All factors are subject to natural and anthropogenic variability, e.g., altering flooding frequency and changing salinity zones due to sea level rise [...] preservation and eventually long-term sequestration (Mcleod et al., 2011). However, the influence of anthropogenic drainage systems by, e.g., the use of artificial ditches in salt marshes of the Wadden Sea, likely [...] the Lower Saxony Wadden Sea National Park: a chance to enhance the blue carbon potential of anthropogenically modified salt marshes 5.1. Policy background Most salt marshes in Germany are part of the Wadden