The relationship between anammox and denitrification in the sediment of an inland river

Zhou, Sheng; Borjigin, Sodbilig; Riya, Shohei; Terada, Akihiko; Hosomi, Masaaki

doi:10.1016/j.scitotenv.2014.05.096

Cited by 96 publications

(53 citation statements)

References 41 publications

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“…The relative contribution of anammox to total N 2 production ranged from 5.9 to 20.5 % in the examined vegetable fields. Both the potential anammox rates and the relative contribution of anammox to N 2 production are within the same ranges reported in most coastal marine (Risgaard-Petersen et al 2004;Schmid et al 2007;Dale et al 2009) and freshwater systems (Yoshinaga et al 2011;Zhao et al 2013;Zhou et al 2014). It should be noted that the ammonium or nitrate availability may limit the anammox Fig.…”

Section: Discussionsupporting

confidence: 79%

“…In addition, a significantly positive correlation between the potential anammox rates and the denitrification rates was also observed in the examined soil cores (R 2 =0.700, p<0.01). This finding suggests that the NO 2 − for anammox process may be mainly dependent on anaerobic NO 3 − reduction from denitrifying bacteria in the examined vegetable fields as previously described in marine sediments (Risgaard-Petersen et al 2004;Nicholls and Trimmer 2009;Hou et al 2013) and freshwater sediments (Zhao et al 2013;Zhou et al 2014). …”

Section: Discussionsupporting

confidence: 73%

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Occurrence and importance of anaerobic ammonium-oxidising bacteria in vegetable soils

Shen

Gao

et al. 2015

Appl Microbiol Biotechnol

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The quantitative importance of anaerobic ammonium oxidation (anammox) has been described in paddy fields, while the presence and importance of anammox in subsurface soil from vegetable fields have not been determined yet. Here, we investigated the occurrence and activity of anammox bacteria in five different types of vegetable fields located in Jiangsu Province, China. Stable isotope experiments confirmed the anammox activity in the examined soils, with the potential rates of 2.1 and 23.2 nmol N2 g(-1) dry soil day(-1), and the anammox accounted for 5.9-20.5% of total soil dinitrogen gas production. It is estimated that a total loss of 7.1-78.2 g N m(-2) year(-1) could be linked to the anammox process in the examined vegetable fields. Phylogenetic analyses showed that multiple co-occurring anammox genera were present in the examined soils, including Candidatus Brocadia, Candidatus Kuenenia, Candidatus Anammoxoglobus and Candidatus Jettenia, and Candidatus Brocadia appeared to be the most common anammox genus. Quantitative PCR further confirmed the presence of anammox bacteria in the examined soils, with the abundance varying from 2.8 × 10(5) to 3.0 × 10(6) copies g(-1) dry soil. Correlation analyses suggested that the soil ammonium concentration had significant influence on the activity and abundance of anammox bacteria in the examined soils. The results of our study showed the presence of diverse anammox bacteria and indicated that the anammox process could serve as an important nitrogen loss pathway in vegetable fields.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 73%

Occurrence and importance of anaerobic ammonium-oxidising bacteria in vegetable soils

Shen

Gao

et al. 2015

Appl Microbiol Biotechnol

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“…Our results suggest that in the Mincio River sediments anammox accounts on average for \2 % of the total N 2 production. This is in agreement with similar measurements in eutrophic freshwater environments where anammox represents a negligible fraction of N 2 fluxes (Trimmer et al 2003;Schubert et al 2006;Zhou et al 2014). We thus considered the IPT as an accurate method for denitrification measurement in the sediments employed in this study.…”

Section: Measurements Of Gas and Nutrient Fluxessupporting

confidence: 87%

Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads

et al. 2015

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Organic enrichment may deeply affect benthic nitrogen (N) cycling in macrophyte meadows, either promoting N loss or its recycling. This depends upon the plasticity of plants and of the associated microbial communities, as those surrounding the rhizosphere. Rates of denitrification, dissolved inorganic N fluxes and N uptake were measured in sediments vegetated by the submerged macrophyte Vallisneria spiralis L. under increasing organic matter loads. The aim was to investigate how the combined N assimilation and denitrification, which subtract N via temporary retention and permanent removal, respectively, do vary along the gradient. Results showed that V. spiralis meadows act as regulators of benthic N cycling even in organic enriched sediments, with negative feedbacks for eutrophication. A moderate organic load stimulates N uptake and denitrification coupled to nitrification in the rhizosphere. This is due to a combination of weakened competition between macrophytes and N cycling bacteria and enhanced radial oxygen loss by roots. An elevated organic enrichment affects N uptake due to hostile conditions in pore water and plant stress and impairs N mineralisation and its removal via denitrification coupled to nitrification. However, the loss of plant performance is almost completely compensated by increased denitrification ofwater column nitrate, resulting in a shift between the relative relevance of temporary and permanent N removal processes

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“…Denitrification has received most attention and is usually considered the dominant mode of reduction (Seitzinger 1988) but that may in part be due to the techniques applied that couldn't distinguish between all three modes (Lansdown et al 2014(Lansdown et al , 2016. Anaerobic ammonium oxidation (anammox) is less widely reported in freshwater environments but has recently been shown to play a significant role in N 2 production in permeable sediments (Lansdown et al 2016;Zhou et al 2014). Anammox is performed by obligate anaerobic bacteria which use nitrite to oxidise ammonia to produce di-nitrogen gas (Van de Graaf et al 1996), the stoichiometry of which actually makes it a more efficient sink for reactive nitrogen over denitrification (Lansdown et al 2016;Thamdrup et al 2006).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Enhanced hyporheic exchange flow around woody debris does not increase nitrate reduction in a sandy streambed

et al. 2017

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Anthropogenic nitrogen pollution is a critical problem in freshwaters. Although riverbeds are known to attenuate nitrate, it is not known if large woody debris (LWD) can increase this ecosystem service through enhanced hyporheic exchange and streambed residence time. Over a year, we monitored the surface water and pore water chemistry at 200 points along a * 50 m reach of a lowland sandy stream with three natural LWD structures. We directly injected 15 N-nitrate at 108 locations within the top 1.5 m of the streambed to quantify in situ denitrification, anammox and dissimilatory nitrate reduction to ammonia, which, on average, contributed 85, 10 and 5% of total nitrate reduction, respectively. Total nitrate reducing activity ranged from 0 to 16 lM h -1 and was highest in the top 30 cm of the stream bed. Depth, ambient nitrate and water residence time explained 44% of the observed variation in nitrate reduction; fastest rates were associated with slow flow and shallow depths. In autumn, when the river was in spate, nitrate reduction (in situ and laboratory measures) was enhanced around the LWD compared with non-woody areas, but this was not seen in the spring and summer. Overall, there was no significant effect of LWD on nitrate reduction rates in surrounding streambed sediments, but higher pore water nitrate concentrations and shorter residence times, close to LWD, indicated enhanced delivery of surface water into the streambed under high flow. When hyporheic exchange is too strong, overall nitrate reduction is inhibited due to short flow-paths and associated high oxygen concentrations.

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The relationship between anammox and denitrification in the sediment of an inland river

Cited by 96 publications

References 41 publications

Occurrence and importance of anaerobic ammonium-oxidising bacteria in vegetable soils

Occurrence and importance of anaerobic ammonium-oxidising bacteria in vegetable soils

Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads

Enhanced hyporheic exchange flow around woody debris does not increase nitrate reduction in a sandy streambed

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