Nitrogen loss from anaerobic ammonium oxidation coupled to Iron(III) reduction in a riparian zone. (December 2017)

• Record Type: Journal Article
• Authors: Ding, Bangjing; Li, Zhengkui; Qin, Yunbin
• Is Part Of: Environmental pollution. Volume 231:Part 1(2017)
• Page Start: 379
• Page End: 386
• Publication Date: 2017-12
• Subjects: Riparian zones -- Nitrogen removal -- Iron reducing bacteria -- Vegetation cover; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2017.08.027
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Anaerobic ammonium oxidation coupled to iron(III) reduction (termed Feammox) is a recently discovered pathway of nitrogen cycling. However, little is known about the pathways of N transformation via Feammox process in riparian zones. In this study, evidence for Feammox in riparian zones with or without vegetation cover was demonstrated using isotope tracing technique and high-throughput sequencing technology. The results showed that Feammox could occur in riparian zones, and demonstrated that N2 directly from Feammox was dominant Feammox pathway. The Feammox rates in vegetated soil samples was 0.32–0.37 mg N kg −1 d −1, which is higher than that in un-vegetated soil samples (0.20 mg N kg −1 d −1 ). Moreover, the growth of vegetation led to a 4.99–6.41% increase in the abundance of iron reducing bacteria ( Anaeromyxobacter, Pseudomonas and Geobacter ) and iron reducing bacteria play an essential role in Feammox process. An estimated loss of 23.7–43.9 kg N ha −1 year −1 was associated with Feammox in the examined riparian zone. Overall, the co-occurrence of ammonium oxidation and iron reduction suggest that Feammox can play an essential role in the pathway of nitrogen removal in riparian zones. Graphical abstract: Highlights: The study evidenced for nitrogen loss from Feammox in riparian zones and showed that N2 directly from Feammox was dominant Feammox pathway. High-throughput 16S rRNA gene amplicon sequencing was used to show the communities of bacteria in riparian zones. The vegetation cover can enhance the abundance of iron reducing bacteria and the potential activities of Feammox. Abstract : The growth of vegetation can enhance anaerobic ammonium oxidation coupled to iron(III) reduction (Feammox) in riparian zones.