Depth-specific distribution and importance of nitrite-dependent anaerobic ammonium and methane-oxidising bacteria in an urban wetland |
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| Institution: | 1. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China;2. State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), Tsinghua University, Beijing 100084, China;1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China;2. Department of Agricultural Resource and Environment, College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, China;1. Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China;2. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China;3. Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia;4. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing, 10038, China;5. Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing, 10038, China;1. CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, Anhui, 230026, People''s Republic of China;2. Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, Jiangsu, 215123, People''s Republic of China;3. Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, Jiangsu, 215123, People''s Republic of China;4. Department of Food Technology, School of Agricultural Technology and Food Technology and Nutrition, Alexander Technological Educational Institute of Thessaloniki, GR-57400, Thessaloniki, Greece |
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| Abstract: | Anaerobic ammonium oxidation (anammox) and nitrite-dependent anaerobic methane oxidation (n-damo) are two recently discovered processes in the nitrogen cycle that are catalysed by anammox bacteria and n-damo bacteria, respectively. Here, the depth-specific distribution and importance of anammox bacteria and n-damo bacteria were studied in an urban wetland, Xixi Wetland, Zhejiang Province (China). Anammox bacteria related to Candidatus Brocadia, Candidatus Kuenenia and Candidatus Anammoxoglobus, and n-damo bacteria related to “Candidatus Methylomirabilis oxyfera” were present in the collected soil samples. The abundance of anammox bacteria (2.6–8.6 × 106 copies g?1 dry soil) in the shallow soils (0–10 cm and 20–30 cm) was higher than that (2.5–9.8 × 105 copies g?1 dry soil) in the deep soils, whereas the abundance of n-damo bacteria (0.6–1.3 × 107 copies g?1 dry soil) in the deep soils (50–60 cm and 90–100 cm) was higher than that (3.4–4.5 × 106 copies g?1 dry soil) in the shallow soils. Anammox activity was detected at all depths, and higher potential rates (12.1–21.4 nmol N2 g?1 dry soil d?1) were observed at depths of 0–10 cm and 20–30 cm compared with the rates (3.5–8.7 nmol N2 g?1 dry soil d?1) measured at depths of 50–60 and 90–100 cm. In contrast, n-damo was mainly occurred at depths of 50–60 cm and 90–100 cm with potential rates of 0.7–5.0 nmol CO2 g?1 dry soil d?1. This study suggested the niche segregation of the anammox bacteria and n-damo bacteria in wetland soils, with anammox bacteria being active primarily in deep soils and n-damo bacteria being active primarily in shallow soils. |
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| Keywords: | Anammox n-damo Vertical distribution Niche segregation Importance Wetlands |
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