Seasonal Variation of Anammox and Denitrification in Sediments of Two Eutrophic Urban Lakes

Zhao, Jin; Zhu, Duanwei; Fan, Junnan; Yue, Hua; Zhou, Wenbing

doi:10.15244/pjoes/59237

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…Our measured rates are comparable with the activities of anammox bacteria in the Yincungang and Henangeng river sediments of the Taihu Lake region (0.1 to 6.8μmol N m ) (Zhao et al, 2013), and are within the range of reported rates in other freshwater environments, ranged from 0 to 137±77 μmol N m -2 h -1 (e.g., Hamersley et al, 2009;Xu et al, 2009;Zhao et al, 2015b). In the present study, the relative contribution of anammox activity to the total N2 production ranged from 2.0±0.8% to 29.9±0.7%, whereby the remainder would be due to denitrification activity.…”

Section: Spatial Variability In Potential Anammox Ratessupporting

confidence: 88%

Nitrogen removal by denitrification and annamox processes in freshwater rivers of high nitrogen loading region of China

2017

Issue 4

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The importance of anaerobic ammonium oxidation (anammox) -a metabolic pathway that can generate dinitrogen -remains poorly understood in freshwater river system. Using the 15 N-isotope pairing technique ( 15 N IPT) combined with membrane inlet mass spectrometry (MIMS), the potential rates of denitrification, anammox and total N removal, and their respective contributions to total N2 production were evaluated in 11 rivers in the Taihu Lake region of China. The measured potential rates of denitrification, total N removal and anammox varied from 18.9±0.3 to 70.0±11.4, 26.3±0.4 to 71.3±11.1 and 1.3±0.3 to 11.0±2.5 μmol N m -2 h -1 , respectively. The relative contribution of anammox to total N2 production (ra%) ranged from 2.0±0.8% to 29.9±0.7%. The mean potential denitrification and the total N removal rates varied spatially in these 11 rivers, with the highest rates occurring in the western rivers of the region, while the mean potential anammox rates and ra% displayed the opposite trend with the highest values occurring in the southern rivers of the region. The contents of nitrate and dissolved organic carbon in sediments appeared to be the primary controlling factors for denitrification and anammox in these studied rivers. Our results indicated that the potential rates of N removal varied spatially, and denitrification is the dominant activity for removing fixed N but the role of anammox is not negligible in freshwater rivers.

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Section: Spatial Variability In Potential Anammox Ratessupporting

confidence: 88%

Nitrogen removal by denitrification and annamox processes in freshwater rivers of high nitrogen loading region of China

2017

Issue 4

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“…A number of studies have focused on the ability and mechanism of lake ecosystems to remove N and indicated that sediment denitrification, anaerobic ammonium oxidation, biological uptake and sedimentation are the main processes for N retention and removal (van Luijn et al, 1996;Saunder and Kalff, 2001; McCrackin and Elser 2010). It has been evidenced that sediment denitrification is the dominant process of N removal in freshwater lakes (e.g., Rissanen et al, 2013;Zhao et al, 2015). Sediment denitrification processes occur under anoxic or anaerobic conditions, resulting in the permanent removal of N through the conversion of nitrate (NO3 -) to nitrous oxide (N2O) and dinitrogen (N2) gases.…”

Section: Introductionmentioning

confidence: 99%

Within-lake variability and environmental controls of sediment denitrification and associated N2O production in a shallow eutrophic lake

Yao

Jiang

Chen

et al. 2016

Ecological Engineering

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Excess nitrogen (N) in lakes may lead to eutrophication and many attendant environmental problems such as water quality decline and loss of aquatic biodiversity. Denitrification in lake sediments can alleviate the effects of eutrophication through removal of N to the atmosphere as N2O and N2. However, N2O contributes to the greenhouse effect and global warming. In this study, we measured three denitrification parameters (i.e., potential denitrification rate, unamended denitrification rate and net N2O production rate) in surface sediments which were collected from 7 sub-lakes of the Lake Donghu, one of the most eutrophic lakes in China. The results showed that a range of water quality and sediment characteristics (e.g., total N and total phosphorus) varied significantly among sub-lakes. The unamended denitrification rate varied between 0.51 and 26.0 ng N g-1 h-1 , while the N2O production rate ranged from less than 0 to 1.68 ng N g-1 h-1. However, there was no significant difference among the sub-lakes in these denitrification parameters. The unamended denitrification rate was positively related to the water NO3concentration and sediment moisture and bulk density. The findings of the present study suggest that sediments in eutrophic lakes can remove large quantities of N through denitrification and may become a significant source of N2O if the N input is maintained or to increase.

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“…For example, Iris pseudacorus and Typha orientalis have been found to support higher diversity of anaerobic ammonium oxidizing bacteria in rhizosphere sediments than in Thalia dealbata ( Chu et al, 2015 ). Nitrogen cycling microbes are the main drivers of denitrification in lakes ( Zhao et al, 2015 ) and therefore understanding microbial diversity in rhizosphere sediments could assist with enhancing remediation of lake eutrophication.…”

Section: Introductionmentioning

confidence: 99%

Diversity of NC10 bacteria associated with sediments of submergedPotamogeton crispus(Alismatales: Potmogetonaceae)

Wang

Huang

Zhang

et al. 2018

PeerJ

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BackgroundThe nitrite-dependent anaerobic methane oxidation (N-DAMO) pathway, which plays an important role in carbon and nitrogen cycling in aquatic ecosystems, is mediated by “Candidatus Methylomirabilis oxyfera” (M. oxyfera) of the NC10 phylum. M. oxyfera-like bacteria are widespread in nature, however, the presence, spatial heterogeneity and genetic diversity of M. oxyfera in the rhizosphere of aquatic plants has not been widely reported.MethodIn order to simulate the rhizosphere microenvironment of submerged plants, Potamogeton crispus was cultivated using the rhizobox approach. Sediments from three compartments of the rhizobox: root (R), near-rhizosphere (including five sub-compartments of one mm width, N1–N5) and non-rhizosphere (>5 mm, Non), were sampled. The 16S rRNA gene library was used to investigate the diversity of M. oxyfera-like bacteria in these sediments.ResultsMethylomirabilis oxyfera-like bacteria were found in all three sections, with all 16S rRNA gene sequences belonging to 16 operational taxonomic units (OTUs). A maximum of six OTUs was found in the N1 sub-compartment of the near-rhizosphere compartment and a minimum of four in the root compartment (R) and N5 near-rhizosphere sub-compartment. Indices of bacterial community diversity (Shannon) and richness (Chao1) were 0.73–1.16 and 4–9, respectively. Phylogenetic analysis showed that OTU1-11 were classified into group b, while OTU12 was in a new cluster of NC10.DiscussionOur results confirmed the existence of M. oxyfera-like bacteria in the rhizosphere microenvironment of the submerged plant P. crispus. Group b of M. oxyfera-like bacteria was the dominant group in this study as opposed to previous findings that both group a and b coexist in most other environments. Our results indicate that understanding the ecophysiology of M. oxyfera-like bacteria group b may help to explain their existence in the rhizosphere sediment of aquatic plant.

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Seasonal Variation of Anammox and Denitrification in Sediments of Two Eutrophic Urban Lakes

Cited by 15 publications

References 22 publications

Nitrogen removal by denitrification and annamox processes in freshwater rivers of high nitrogen loading region of China

Nitrogen removal by denitrification and annamox processes in freshwater rivers of high nitrogen loading region of China

Within-lake variability and environmental controls of sediment denitrification and associated N2O production in a shallow eutrophic lake

Diversity of NC10 bacteria associated with sediments of submergedPotamogeton crispus(Alismatales: Potmogetonaceae)

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