Two methods including tillage

sand and soil mulching were applied to reduce surface compaction of dredged sediment.The combining effects of submerged plant restoration and surface covering were tested in terms of controlling the release of the inner-loaded nutritional salts from contaminated lake sediment.The results show that different sand and soil coverage notably reduced nitrogen and phosphate release rates at the beginning of the experiments

but the release rates bounced back after a extended time period.With comparison of the control

the treatment of combining surface covering and plant restoration(growingPotamogeton crispus) significantly retarded release rates of nitrogen and phosphate.However

the treatment of combining tillage and plant restoration provided the superb release rate of inner-loaded nutrients.