Simulated study on phosphorus release of Chao Lake sediment

The sediment phosphorus release study was similated by controlling of DO, pH, temperature and hydrodynamic condition under the lab condition. The results are showed that: (1) Under the anaerobic condition, the sediment phosphorus release to water and the release intensity increased with the increase of pH value and under aerobic condition, the sediment absorbed phosphorus from water and the absorb intensity is keeping with pH value decrease; (2) High temperature profits sediment phosphorus released to water, and the maximum released intensity increased with the increase of temperature; (3) The amount of sediment phosphorus release under the stirring condition was more than the one under still condition. (4) Microbe affected the sediment phosphorus release obviously. Under T =25℃, pH=7\^5 and anaerobic condition, the phosphorus release amount coued increased about 17%.