Continuously submerged and intermittently submerged sediments collected from Shendinghe River estuary of Danjiangkou reservoir,were employed to conduct the dynamic water level( WL) regulation experiments with 3rates of change of water level( 0 cm. d~(- 1),3 cm. d~(- 1)and 6 cm. d~(- 1)). The whole experiments lasted three WL regulating cycles( nearly four months) and each single cycle included four WL dynamic phases: decline,stable,ascend and re-stable. The results show that: WL regulation promotes OM loss ...