| Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China |
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| 作者姓名： | XU Jirong WANG Youshao WANG Qinji YIN Jianping |
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| 作者单位： | XU Jirong1，2*，WANG Youshao1，WANG Qinji1，YIN Jianping1 1. South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China 2. Faculty of Architectural Engineering and Environment of Ningbo University，Zhejiang 315211，China |
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| 基金项目： | supported by the Knowledge Innovation Engineering of Chinese Academy of Sciences under contract，广东省自然科学基金 |
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| 摘 要： | 1 Introduction Estuaries have been subject to intense anthro- pogenic influences over recent decades by inputs of ni- trogen as a consequence of fertilizer usage and sewage/waste input (Howarth et al., 1996). Thus, the capacity of an estuary to buffer or alleviate additional nutrients is of importance in modifying the load of ni- trogen in the marine ecosystem. The role of microor- ganisms in regulating fluxes of nitrogen from land to sea through estuaries has received increased attention (Ni…
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| 关 键 词： | 一氧化二氮 反硝化作用 珠江河口 细菌活性 同化抑制 |
| 收稿时间： | 8/8/2004 12:00:00 AM |
| 修稿时间： | 2005/1/26 0:00:00 |
Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China |
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| XU Jirong,WANG Youshao,WANG Qinji,YIN Jianping.Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China[J].Acta Oceanologica Sinica,2005,24(3):122-130. |
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| Authors: | XU Jirong WANG Youshao WANG Qinji and YIN Jianping |
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| Institution: | 1.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Faculty of Architectural Engineering and Environment of Ningbo University, Zhejiang 315211, China2.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | The concentrations of nitrous oxide varies between 57 and 329 nmol/dm3, saturation is 674%～4 134% in the Zhujiang River Estuary.This suggests that the area is an emissive source of nitrous oxide. The acetylene inhibition technique is employed to evaluate the rates ofnitrification, denitrification and nitrate reduction by bacterial activities in the sediments at three sites. The average of nitrification,tical profiles of the sediments show that the nitrification and denitrification processes mainly take place in the depth from 0 to 4 cm and depend on regional conditions. The rates of nitrification, denitrification and nitrate reduction are dominated by Eh, nitrate and ammonium concentrations in sediments and DO in overlay water. There is a coupling between nitrification and denitrification. |
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| Keywords: | nitrous oxide nitrification denitrification nitrate reduction acetylene inhibition technique bacterial activities Zhujiang River Estuary |
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