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The litter and the residue of the aquatic plants play an important role in the nutrient cycle and energy flow. Under natural conditions, the sediment was collected in situ at different stages of Eichhornia crassipes, and its changes of the litter and residue were studied. The weight of sediment had an obviously increasing trend from waterhycinth death to its disappearance from water surface. When the litter and residue disappeared completely from water surface, the weight of sediment and the downward fluxes reached the maximum value 579.59g/m2, 7.54g/(m2·d) respectively. Both of them had a significantly positive correlation with the water temperature. When the litter and residue disappeared completely from water surface, the organic carbon, total nitrogen and total phosphorus were low in the growth but high in the floating, and reached the maximum values 40.29%, 3.66%, 0.90% respectively, then they gradually decreased, and tended to be stable.

The litter and residue of <i>Eichhornia crassipes</i>(Mart.) Solms