Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period
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 s...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.1082768/full |
| _version_ | 1811205269706768384 |
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| author | Dongyao Sun Dongyao Sun Jiafang Huang Min Luo Cheng Chen Xue Lan Weifang Hu |
| author_facet | Dongyao Sun Dongyao Sun Jiafang Huang Min Luo Cheng Chen Xue Lan Weifang Hu |
| author_sort | Dongyao Sun |
| collection | DOAJ |
| description | 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 15N 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. |
| first_indexed | 2024-04-12T03:29:09Z |
| format | Article |
| id | doaj.art-0c99a9e8c63f4f52bfc57f429b95d6e6 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-12T03:29:09Z |
| publishDate | 2022-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-0c99a9e8c63f4f52bfc57f429b95d6e62022-12-22T03:49:36ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-12-01910.3389/fmars.2022.10827681082768Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture periodDongyao Sun0Dongyao Sun1Jiafang Huang2Min Luo3Cheng Chen4Xue Lan5Weifang Hu6School of Geography Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou, ChinaResearch Center of Geography and Ecological Environment, Fuzhou University, Fuzhou, ChinaKey Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai, ChinaSchool of Geographical Sciences, Fujian Normal University, Fuzhou, ChinaResearch Center of Geography and Ecological Environment, Fuzhou University, Fuzhou, ChinaCollege of Marine Sciences, South China Agricultural University, Guangzhou, ChinaInstitute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou, ChinaIntensive 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 15N 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.https://www.frontiersin.org/articles/10.3389/fmars.2022.1082768/fulldenitrificationanammoxDNRAshrimp pondssediment |
| spellingShingle | Dongyao Sun Dongyao Sun Jiafang Huang Min Luo Cheng Chen Xue Lan Weifang Hu Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period Frontiers in Marine Science denitrification anammox DNRA shrimp ponds sediment |
| title | Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| title_full | Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| title_fullStr | Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| title_full_unstemmed | Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| title_short | Dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| title_sort | dissimilatory nitrate reduction processes in surface sediments of shrimp ponds during the culture period |
| topic | denitrification anammox DNRA shrimp ponds sediment |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.1082768/full |
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