[Objective] To study the factors influencing nitrogen and phosphorus release in eutrophication lake sediment in order to provide the scientific significance for eutrophication lake management.[Methods] Taking the urban landscape lake

Cuihu lake

which eutrophication is more serious

in Kunming City

Yunnan Province

as the study area

by controlling the different pH value

temperature and nutrient concentration of overlying water to simulate factors that affect the release of nitrogen and phosphorus in sediment.[Results] (1) Under the same conditions

the release rate of nitrogen and phosphorus in sediment was affected by the pH value of the water

and the release rate of the neutral environment (pH=7.5) was higher than that of acidic and alkaline water. Under conditions of sediment release for 5 hours

10 hours and pH=7.5

the release of phosphorus was 5.88 mg/kg and 8.28 mg/kg respectively

nitrogen emission was 22.8 mg/kg and 38.4 mg/kg. (2) The release of nitrogen and phosphorus increased with the increase of temperature. Under temperature 20℃

the nitrogen and phosphorus release reached 28.62 mg/kg and 3.75 mg/kg. (3) The release rate of nitrogen and phosphorus in sediment decreased with the increase of the concentration of overlying water

while it increased with the extension of storage time. When overlying water with ammonia concentration of 0.31 mg/L placed for 5 hours

the sediment nitrogen emissions reached a maximum of 21.63 mg/kg. When it was placed for 10 hours with ammonia concentration of 2.37 mg/L

the sediment nitrogen emissions reached a maximum of 39.22 mg/kg

when the phosphorus concentration of the overlying water was 0.14 mg/L

sediment total phosphorus release reached to the maximum; When it was placed for 5 hours and 10 hours respectively

the maximum release of phosphorus reached 4.25 mg/kg and 4.91 mg/kg.[Conclusion] The release of nutrients in sediment is very complex

and its release rate is influenced by the pH value

temperature

and nutrient concentration of water.