Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period
文献类型： 外文期刊
作者： Sun, Dongyao 1 ; Huang, Jiafang 2 ; Luo, Min 3 ; Chen, Cheng 4 ; Lan, Xue 5 ; Hu, Weifang 6 ;
作者机构： 1.Suzhou Univ Sci & Technol, Sch Geog Sci & Geomatics Engn, Suzhou, Peoples R China
2.East China Normal Univ, Sch Geog Sci, Key Lab Geog Informat Sci, Minist Educ, Shanghai, Peoples R China
3.Fujian Normal Univ, Sch Geog Sci, Fuzhou, Peoples R China
4.Fuzhou Univ, Res Ctr Geog & Ecol Environm, Fuzhou, Peoples R China
5.South China Agr Univ, Coll Marine Sci, Guangzhou, Peoples R China
6.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou, Peoples R China
关键词： denitrification; anammox; DNRA; shrimp ponds; sediment
期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：5.247； 五年影响因子：5.72 ）
ISSN：
年卷期： 2022 年 9 卷
页码：
收录情况： SCI
摘要： Intensive aquaculture in estuaries and coasts has resulted in several ecological and environmental problems. Among various nitrogen transformation pathway, dissimilatory nitrate (NO3-) reduction is considered to be highly important in regulating reactive nitrogen. However, there are relatively few studies on the processes and contribution of NOx- reduction in sediment during the shrimp pond culture period. Three sediment NO3- reduction processes, denitrification (DNF), anaerobic ammonium oxidation (ANA), and dissimilatory NO3- reduction to ammonium (DNRA), were surveyed in eight shrimp ponds across three subtropical estuaries using N-15 isotope tracing experiments. The rates of DNF, ANA and DNRA ranged from 2.87-18.11, 0.10-1.92, and 0.21-1.25 nmol N g (-1) h (-1), respectively. DNF was responsible for 64.2-91.6% of the total NO3- reduction. Regarding environmental factors, C and N substrates, as well as salinity, significantly affected NO3- reduction. In general, the N losses were approximately 32.43-131.64 g N m(-2) yr(-1) for DNF and 2.38-15.85 g N m(-2) yr(-1) for ANA in this study, indicating that coastal reclamation is a nonnegligible way to remove nitrogen. Our results provide a scientific foundation for understanding the mechanism of nitrogen cycling in the artificial aquatic environment of shrimp ponds.
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