Wetlands are large reservoirs of soil organic carbon (SOC), storing one‐third of global SOC within 6% of the land surface. However, the feedback direction and magnitude of wetland SOC storage to climate warming remain unclear. Here we present results from an 8‐year (2014–2022) wetland warming experiment in the Yellow River Delta, revealing that wetland SOC storage responds to warming in a phase‐dependent manner. We found that...