| XU Jirong,WANG Youshao,WANG Qinji,YIN Jianping. 2005. Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China. Acta Oceanologica Sinica, (3):122－130 |
| Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China |
| Nitrous oxide concentration and nitrification and denitrification in Zhujiang River Estuary, China |
| Received:August 08, 2004 Revised:January 26, 2005 |
| DOI： |
| Key words:nitrous oxide nitrification denitrification nitrate reduction acetylene inhibition technique bacterial activities Zhujiang River Estuary |
| 中文关键词: nitrous oxide nitrification denitrification nitrate reduction acetylene inhibition technique bacterial activities Zhujiang River Estuary |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XU Jirong | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Faculty of Architectural Engineering and Environment of Ningbo University, Zhejiang 315211, China | jirongxu@sina.com | | WANG Youshao | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | WANG Qinji | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | YIN Jianping | 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,denitrification and nitrate reduction rates ranges from 0.32 to 2.43,0.03 to 0.84 and 4.17 to 13.06 mmol/(m2·h),respectively.The vertical 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. |
| 中文摘要: |
| 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,denitrification and nitrate reduction rates ranges from 0.32 to 2.43,0.03 to 0.84 and 4.17 to 13.06 mmol/(m2·h),respectively.The vertical 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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