杜塘水库春季沉积物氮营养盐释放速率研究

We analysed the the concentration of ammonia and total nitrogen in the surface sediment of the Dutang Reservoir in spring .The results showed that the concentration of ammonia ranged from 173.12±3.12 to 235.61±2.39mg/kg and concentration of total nitrogen ranged from 1569.34±17.84 to 2474.19±55.13mg/kg. The intact sediment cores’ incubation and the pore water diffusive model were used for research of the ammonia releasing flux in the water-sediment interface in Dutang Reservoir in spring. The releasing fluxes of the inlet section, central section and dam section estimated with intact sediment cores’ incubation (R) were 42.39 mg•(m2•d)-1 , 74.95 mg•(m2•d) –1and 127.57 mg•(m2•d)-1 and the molecular diffusive flux (F) were 39.92mg•(m2•d)-1 , 71.19 mg•(m2•d) –1 and 118.01 mg•(m2•d) –1 respectively. The results showed that the sediment existed an obvious ammonia relief capability.