Abstract
The nitrification rate, ammonia oxidation and nitrite oxidation potential in surface water, and sediment of Lianhua Stream were studied. Laboratory microenvironment experiments show that the nitrification rate at the interface between sediment and overlying water is much higher than that in surface water, with the nitrification rate 0.08834-0.1591mg(L.d)−1 and 0.0001 - 0.0025 mg(L.d)−1 respectively. The potential of ammonia oxidation and nitrite oxidation of sediment in Lianhua Stream is also significantly higher than that of surface water. The total ammonia oxidation potential of sediment in Lianhua Stream is 8.396 - 13.247 mg.(L.d)−1, while the total nitrate oxidation potential is 3.522 - 9.322 mg.(L.d)−1. The high concentration of ammonia nitrogen promotes the activity of ammonia oxidative bacteria, which leads to the potential for high ammonia oxidation. Meanwhile, the high rate of ammonia oxidation and low rate of nitrite oxidation in the water body contribute to the accumulation of nitrites in the water.
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