傀儡湖沉积物-水界面硝酸盐异养还原过程研究

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Abstract Denitrification (DNF) and dissimilatory nitrate reduction to ammonium (DNRA) are two major processes of dissimilatory nitrate reduction in aquatic ecosystems. The competition between DNF and DNRA controls the dissimilatory reduction pattern and the final fate of nitrate in aquatic ecosystems. In this study, DNF and DNRA processes at the sediment-water interface (SWI) in Lake Kuilei (a shallow freshwater lake in Lake Taihu basin) were studied by using the stable nitrogen isotope tracing method. DNF and DNRA rates at the SWI and potential contributions to the total dissimilatory nitrate reduction from both processes were quantitatively estimated. Results showed that sediments served as the source of NH₄⁺-N and the sink of NO₃^--N in Lake Kuilei. DNF and DNRA rates at the SWI were 18.88~54.00 μmol/(kg·h) (mean value of 36.39±3.86 μmol/(kg·h)) and 1.02~5.88 μmol/(kg·h) (mean values of 36.39±3.86, 3.21±1.15 μmol/(kg·h)), respectively. The DNF rate was significantly correlated with the sediment organic matter and the water content, while the DNRA rate was correlated with the sediment oxygen demand (SOD). Moreover, DNF was confirmed as the predominant process of dissimilatory nitrate reduction process in Lake Kuilei, which contributed 84.23~96.90% to the total dissimilatory nitrate reduction compared with only 3.10%~15.77% from DNRA. Compared with marine and estuarine areas, lower DNRA rates and fewer DNRA contributions to the total nitrate reduction were observed in freshwater lake ecosystems.

Key words： Lake Kuilei sediment-water interface denitrification dissimilatory nitrate reduction to ammonium (DNRA)

Received: 20 November 2017

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Corresponding Authors: 张路,研究员,luzhang@niglas.ac.cn E-mail: luzhang@niglas.ac.cn

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	XUE Jing-ya
	JIANG Xing-yu
	YAO Xiao-long
	LI Min
	ZHANG Lu

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XUE Jing-ya,JIANG Xing-yu,YAO Xiao-long等. Dissimilatory nitrate reduction processes at the sediment-water interface in Lake Kuilei[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2289-2296.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I6/2289

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