Abstract
Denitrification is an important N removal process in aquatic systems but is also implicated as a potential source of global N2O emissions. However, the key factors controlling this process as well as N2O emissions remain unclear. In this study, we identified the main factors that regulate the production of net N2 and N2O in sediments collected from rivers with a large amount of sewage input in the Taihu Lake region. Net N2 and N2O production were strongly associated with the addition of NO3 −-N and NH4 +-N. Specifically, NO3 −-N controlled net N2 production following Michaelis–Menten kinetics. The maximum rate of net N2 production (V max) was 116.3 μmol N2-N m−2 h−1, and the apparent half-saturation concentration (k m) was 0.65 mg N L−1. N2O to N2 ratios increased from 0.18 ± 0.03 to 0.68 ± 0.16 with the addition of NO3 −-N, suggesting that increasing NO3 −-N concentrations favored the production of N2O more than N2. The addition of acetate enhanced net N2 production and N2O to N2 ratios, but the ratios decreased by about 59.5 % when acetate concentrations increased from 50 to 100 mg C L−1, suggesting that the increase of N2O to N2 ratios had more to do with the net N2 production rate rather than acetate addition in this experiment. The addition of Cl− did not affect the net N2 production rates, but significantly enhanced N2O to N2 ratios (the ratios increased from 0.02 ± 0.00 to 0.10 ± 0.00), demonstrating that the high salinity effect might have a significant regional effect on N2O production. Our results suggest that the presence of N-enriching sewage discharges appear to stimulate N removal but also increase N2O to N2 ratios.
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This work was financially supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KZCX2-YW-GJ01) and the Natural Science Foundation of China (Nos. 41071196 and 41061140515).
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Zhao, Y., Xia, Y., Li, B. et al. Influence of environmental factors on net N2 and N2O production in sediment of freshwater rivers. Environ Sci Pollut Res 21, 9973–9982 (2014). https://doi.org/10.1007/s11356-014-2908-6
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DOI: https://doi.org/10.1007/s11356-014-2908-6