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Denitrification in tidal flat sediment, Yangtze estuary

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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.

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Authors and Affiliations

  1. School of Resources and Environment Science, East China Normal University, Shanghai, 200062, China

    Wang DongQi, Chen ZhenLou, Xu ShiYuan, Da LiangJun, Bi ChunJuan & Wang Jun

  2. School of Life Science, East China Normal University, Shanghai, 200062, China

    Wang DongQi

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  1. Wang DongQi
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  2. Chen ZhenLou
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  4. Da LiangJun
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Correspondence to Chen ZhenLou.

Additional information

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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Wang, D., Chen, Z., Xu, S. et al. Denitrification in tidal flat sediment, Yangtze estuary. Sci. China Ser. B-Chem. 50, 812–820 (2007). https://doi.org/10.1007/s11426-007-0109-6

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  • DOI: https://doi.org/10.1007/s11426-007-0109-6

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