Denitrification in tidal flat sediment, Yangtze estuary |
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基金项目: | 国家自然科学基金;上海市科技研究基金;中国博士后科学基金 |
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摘 要: |
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收稿时间: | 26 September 2006 |
修稿时间: | 19 March 2007 |
Denitrification in tidal flat sediment,Yangtze estuary |
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Authors: | Wang DongQi Chen ZhenLou Xu ShiYuan Da LiangJun Bi ChunJuan Wang Jun |
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Institution: | 1. School of Resources and Environment Science, East China Normal University, Shanghai 200062, China;School of Life Science, East China Normal University, Shanghai 200062, China 2. School of Resources and Environment Science, East China Normal University, Shanghai 200062, China |
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Abstract: | Sediment denitrification rates at six Yangtze River estuary tidal flat locations (mudflats and salt marshes) were measured
from July 2003 to October 2004. In winter and summer, spatial distribution of denitrification rates was not great in the Yangtze
estuary, while in spring and autumn, denitrification rates had a great spatial distribution because of the human activity
effect. The temporal change of denitrification rates was greater. They ranged from 0.2 to 36.4 μmolN·m−2·h−1, and were higher in the summertime. The annual average of sediment denitrification rate was 18.2±12.3 μmolN·m−2·h−1 in the middle tidal flat and 15.1±9.45 μmolN·m−2·h−1 in the low tidal flat in the Yangtze estuary. Data analysis indicated that the temperature was the primary factor controlling
the process of denitrification (significant positive correlation, P<0.01); at the same time, the content of sediment total nitrogen (TN) and the molar ratio of sediment carbon and nitrogen
(C/N) had significant positive correlation (P<0.05) and negative correlation (P<0.05) with denitrification rates, respectively. In the Yangtze estuary, increasing of water salinity had no significant inhibition
of denitrification because of the wide change range of water salinity.
Supported by the National Natural Science Foundation of China (Grant Nos. 40173030, 40571006 and 40131020), the Science &
Technology Department of Shanghai (Grant Nos. 05DZ120007 and 05JC14059) and China Postdoctoral Science Foundation. |
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Keywords: | Yangtze estuary tidal flat sediment denitrification effect factors |
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