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Denitrification and Nitrate Reduction to Ammoniumin Taihu Lake and Yellow Sea Inter-Tidal MarineSedimentsEnglish Full Text

YIN SHIXUE;CHENG LIMING;SHEN QIRONG(1Agronomg Department, Agricultural College, Yangzhou University, Yangzhou 225009 (China))(2Collage 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 marinesediments 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 differentratios of glucose-C to nitrate-N. Acetylene inhibition technique was applied to measure denitrification in theslumes. All samples were incubated anaerobically under argon atmosphere. Data showed that Taihu Lakesediment produced more N2O than marine sediment. Denitrification potential was higher in Taihu Lakesediment than in marne one. Glucose added increased denitrification activity but not the denitrification po-tential 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 poteatial, as indicated by maximum N2O production by acetylene blockage, was lower than that treatedwith no or 2.5 mmol L-l glucose. Acetylene was suspected to have inhibitory effect on dissimilatory nitratereduction to ammonium.
  • Series:

    (D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy

  • Subject:

    Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy

  • Classification Code:

    S156.43

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