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| N2O Flux Across Sediments-water Interface and Its Contribution to Dissolved N2O in the Chao Lake Tributaries, China |
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| KeyWord:sediment; dissolved N2O; release flux; denitrification rate |
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| Abstract: |
| An in situ incubation and measurement was conducted in November 2010 in Fengle River and Hangbu River, two major tributaries of Chao Lake, to investigate the impact of sediment on dissolved N2O in water column and the denitrification rate of sediments. Results showed that Fengle River and Hangbu River were both supersaturated with N2O with a mean concentration of 0.26±0.10 μg N-N2O·L-1（186 in percent saturation）and 0.18±0.04（SD）（151 in percent saturation） μg N-N2O·L-1, respectively. This suggested the studied rivers were potential sources of atmospheric N2O. The mean N2O flux across sediment-water interface was 0.39±0.44（SD） μg N-N2O·m-2·h-1 in Fengle River and 0.15±0.16（SD） μg N-N2O·m-2·h-1 in Hangbu River. It was estimated that about 89% of the dissolved N2O in Fengle River and 45% of the dissolved N2O in Hangbu River was contributed by river sediments. Denitrification rate in sediments was estimated through the reduction of nitrate over incubation time. The mean denitrification rate in sediments was 0.12±0.07 mg N·m-2·h-1 in Fengle River and 0.10±0.05 mg N·m-2·h-1 in Hangbu River, which is relatively low than values previously reported for different aquatic ecosystems. |
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