Pedosphere 9(4): 305--309, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Denitrification and nitrate reduction to ammonium in Taihu Lake and Yellow Sea inter-tidal marine sediments |
| YIN Shi-Xue1, CHENG Li-Ming1 and SHEN Qi-Rong2 |
1 Agronomg Department, Agricultural College, Yangzhou University, Yangzhou 225009 (China)
2 Collage of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 21O095 (China) |
| ABSTRACT |
| Denitrification and nitrate reduction to ammonium in Taihu Lake and Yellow Sea inter-tidal marine sediments were studied. The sediment samples were made into slurry containing 150 g dry matter per liter. Various amounts of glucose and 5 mmol L-1 of potassium nitrate were added in order to achieve different ratios of glucose-C to nitrate-N. Acetylene inhibition technique was applied to measure denitrification in the slurries. All samples were incubated anaerobically under argon atmosphere. Data showed that Taihu Lake sediment produced more N2O than marine sediment. Denitrification potential was higher in Taihu Lake sediment than in marine one. Glucose added increased denitrification activity but not the denitrification potential of the sediments. Dissimilatory nitrate reduction to ammonium seemed to occur in marine sediment, but not in freshwater one. When the marine sediment was treated with 25 mmol L-1 glucose, its denitrification potential, as indicated by maximum N2O production by acetylene blockage, was lower than that treated with no or 2.5 mmol L-1 glucose. Acetylene was suspected to have inhibitory effect on dissimilatory nitrate reduction to ammonium. |
| Key Words: denitrification, dissimilatory nitrate reduction to ammonium, marine sediment, Taihu Lake sediment |
| Citation: Yin, S. X., Cheng, L. M. and Shen, Q. R. 1999. Denitrification and nitrate reduction to ammonium in Taihu Lake and Yellow Sea inter-tidal marine sediments. Pedosphere. 9(4): 305-309. |
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