【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
【机 构】
：
South China Sea Institute of Oceanology,Faculty of Architectural Engineering and Environment of Ning
【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
论文部分内容阅读
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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