Denitrification in Chongming east tidal flat sediment, Yangtze estuary, China

作     者：WANG Dongqi1,2, CHEN Zhenlou1,3, XU Shiyuan1,2, HU Lingzhen1 & WANG Jun1,2 1. College of Resources & Environment, East China Normal University, Shanghai 200062, China 2. State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics, East China Normal University, Shanghai 200062, China 3. Key Laboratory of Geographical Information Science of Ministry of Education,East China Normal University,Shanghai 200062, China 

作者机构：College of Resources & Environment East China Normal University Shanghai China State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics East China Normal University Shanghai China Key Laboratory of Geographical Information Science of Ministry of Education East China Normal University Shanghai China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2006年第49卷第10期

页      面：1090-1097页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.40131020 and 40173030) the Science&Technology Department of Shanghai(Grant Nos.05DZ120007 05JC14059) the Environment Protection Department of Shanghai and the PhD Program Scholarship Fund of ECNU 2005 

主　　题：Yangtze estuary, tidal flat sediment, denitrification, nitrous oxide, effect factor. 

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.