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| Denitrification in Chongming east tidal flat sediment, Yangtze estuary, China | |
| 摘 要： | From July 2003 to July 2004, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2O) production rate was very low in the water, Chongming east tidal flat (CM) sediment was the N2O source of the water. Sediment N2O natural production rate was between -0.08 and 1.74 μmolN·m-2·h-1. N2O natural production rate was higher in the summer. The difference of the N2O natural production rate in the different tidal flats, the correlation between the N2O natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat sediment denitrification was the main process of the N2O production, while in the low tidal flat sediment, the production of the N2O came from several processes of the nitrogen cycling. Tidal flat sediment denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the sediment denitrification rate was wide, from 1.12 to 33.34 μmolN·m-2·h-1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat sediment denitrification. |
| 收稿时间： | 29 September 2005 |
| 修稿时间： | 27 February 2006 |
Denitrification in Chongming east tidal flat sediment, Yangtze estuary, China |
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| Authors: | WANG Dongqi CHEN Zhenlou XU Shiyuan HU Lingzhen WANG Jun |
| Institution: | 1. College of Resources & Environment,East China Normal University,Shanghai 200062,China;State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics,East China Normal University,Shanghai 200062,China 2. College of Resources & Environment,East China Normal University,Shanghai 200062,China;Key Laboratory of Geographical Information Science of Ministry of Education,East China Normal University,Shanghai 200062,China 3. College of Resources & Environment,East China Normal University,Shanghai 200062,China |
| Abstract: | From July 2003 to July 2004, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2O) production rate was very low in the water, Chongming east tidal flat (CM) sediment was the N2O source of the water. Sediment N2O natural production rate was between −0.08 and 1.74 μmolN·m−2·h−1. N2O natural production rate was higher in the summer. The difference of the N2O natural production rate in the different tidal flats, the correlation between the N2O natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat sediment denitrification was the main process of the N2O production, while in the low tidal flat sediment, the production of the N2O came from several processes of the nitrogen cycling. Tidal flat sediment denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the sediment denitrification rate was wide, from 1.12 to 33.34 μmolN·m−2·h−1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat sediment denitrification. |
| Keywords: | Yangtze estuary tidal flat sediment denitrification nitrous oxide effect factor |
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