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| Denitrification in Qi'ao Island coastal zone, the Zhujiang Estuary in China | |
| 作者姓名： | WANG Hu ZHOU Huaiyang PENG Xiaotong YANG Qunhui QIN Chaomei YIN Xijie CHEN Guangqian |
| 作者单位： | WANG Hu(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China);ZHOU Huaiyang,PENG Xiaotong,YANG Qunhui(State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China);QIN Chaomei,CHEN Guangqian(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China);YIN Xijie(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China) |
| 基金项目： | Key Program and General Program of the National Natural Science Foundation of China，COMRA' s 11th Five Year Program，广东省自然科学基金 |
| 摘 要： | Samples of sediments and the overlying water were collected in the Qi'ao Island coastal zone, the Zhujiang (Pearl River) Estuary (ZE). Denitrification rates, sediment oxygen demand (SOD) , and fluxes of inorganic nitrogen compounds were investigated with N2 flux method, using a self-designed continuous flow through and auto-sampling system. The results indicate that the denitrification rates varied between 222 and 908 μmol/(m2·h) with an average of 499 μmol/(m2·h). During incubation, the sediments absorbed dissolved oxygen in the overlying water with SOD ranging from 300 to 2 363 μmol/(m2·h). The denitrification rates were highly correlated with the SOD (r2 =0.77) regardless of the NO3- + NO2- concentrations in the overlying water, organ- ic carbon contents in sediments and water temperature, suggesting that the SOD was probably the main environ-mental factor controlling the denitrification in the Qi'ao Island coastal zone. There was a net flux of NO3- + NO2-into the sediments from the overlying water. The NH4+ flux from sediments into water as the result of mineraliza-tion was between 12. 3 and 210. 3 μmol/(m2·h) ,which seems limited by both organic carbon content in sedi-ment and dissolved oxygen concentration in the overlying water. |
| 关 键 词： | 淇澳岛 珠江口 反硝化 超氧化物歧化酶 海区 溶解氧浓度 有机碳含量 自动取样系统 |
| 收稿时间： | 2007/8/23 0:00:00 |
| 修稿时间： | 2008/2/22 0:00:00 |
Denitrification in Qi'ao Island coastal zone, the Zhujiang Estuary in China |
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| WANG Hu,ZHOU Huaiyang,PENG Xiaotong,YANG Qunhui,QIN Chaomei,YIN Xijie,CHEN Guangqian.Denitrification in Qi''ao Island coastal zone, the Zhujiang Estuary in China[J].Acta Oceanologica Sinica,2009,28(1):37-46. | |
| Authors: | WANG Hu ZHOU Huaiyang PENG Xiaotong YANG Qunhui QIN Chaomei YIN Xijie and CHEN Guangqian |
| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China 2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 4. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Samples of sediments and the overlying water were collected in the Qi'ao Island coastal zone, the Zhujiang (Pearl River) Estuary (ZE). Denitrification rates, sediment oxygen demand (SOD) , and fluxes of inorganic nitrogen compounds were investigated with N2 flux method, using a self-designed continuous flow through and auto-sampling system. The results indicate that the denitrification rates varied between 222 and 908 μmol/(m2·h) with an average of 499 μmol/(m2·h). During incubation, the sediments absorbed dissolved oxygen in the overlying water with SOD ranging from 300 to 2 363 μmol/(m2·h). The denitrification rates were highly correlated with the SOD (r2 =0.77) regardless of the NO3- + NO2- concentrations in the overlying water, organ- ic carbon contents in sediments and water temperature, suggesting that the SOD was probably the main environ-mental factor controlling the denitrification in the Qi'ao Island coastal zone. There was a net flux of NO3- + NO2-into the sediments from the overlying water. The NH4+ flux from sediments into water as the result of mineraliza-tion was between 12. 3 and 210. 3 μmol/(m2·h) ,which seems limited by both organic carbon content in sedi-ment and dissolved oxygen concentration in the overlying water. |
| Keywords: | denitrification N2 flux SOD inorganic nitrogen compound Qi'ao Island coastal zone Zhu-jiang Estuary |
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