Sediment methane dynamics along the Elbe River

Bednařík, Adam; Blaser, Martin; Matoušů, Anna; Tušer, Michal; Chaudhary, Prem Prashant; Šimek, Karel; Rulı́k, Martin

doi:10.1016/j.limno.2019.125716

Cited by 9 publications

(5 citation statements)

References 78 publications

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“…S4). This finding is also consistent with previous reports from stream sediment incubations (Bodmer et al, 2020;Romeijn et al, 2019;Bednařík et al, 2019).…”

Section: Concentration Profiles Show Steep Geochemical Gradients and ...supporting

confidence: 94%

“…Here, δ 13 C-CH 4 values in the methanogenic zone were consistently lower than −60 ‰, which is characteristic for hydrogenotrophic methanogenesis (Whiticar, 1999). This fits well to findings of Bednařík et al (2019) and Mach et al (2015), who found that hydrogenotrophic methanogenesis was the dominant CH 4 production pathway in the HZ of the Elbe and Sitka rivers.…”

Section: Stable Carbon Isotopes Of Ch 4 Reveal the Importance Of Hydr...supporting

confidence: 89%

“…This is in line with findings by Shelley et al (2015) and Bodmer et al (2020), who measured increasing CH 4 production and oxidation capacity with decreasing grain diameter. Other parameters stimulating CH 4 production and oxidation in streams are high organic carbon contents (Bodmer et al, 2020;Romeijn et al, 2019;Bednařík et al, 2019) and shading (Shelley et al, 2017). Further, methanogenic and methanotrophic activity in river sediments has been found to increase with rising temperature (Shelley et al, 2015;Comer-Warner et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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High-resolution vertical biogeochemical profiles in the hyporheic zone reveal insights into microbial methane cycling

et al. 2022

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Abstract. Facing the challenges of climate change, policy making relies on sound greenhouse gas (GHG) budgets. Rivers and streams emit large quantities of the potent GHG methane (CH4), but their global impact on atmospheric CH4 concentrations is highly uncertain. In situ data from the hyporheic zone (HZ), where most CH4 is produced and some of it can be oxidized to CO2, are lacking for an accurate description of CH4 production and consumption in streams. To address this, we recorded high-resolution depth-resolved geochemical profiles at five different locations in the stream bed of the river Moosach, southern Germany. Specifically, we measured pore-water concentrations and stable carbon isotopes (δ13C) of dissolved CH4 as well as relevant electron acceptors for oxidation with a 1 cm vertical depth resolution. Findings were interpreted with the help of a numerical model, and 16S rRNA gene analyses added information on the microbial community at one of the locations. Our data confirm with pore-water CH4 concentrations of up to 1000 µmol L−1 that large quantities of CH4 are produced in the HZ. Stable isotope measurements of CH4 suggest that hydrogenotrophic methanogenesis represents a dominant pathway for CH4 production in the HZ of the river Moosach, while a relatively high abundance of a novel group of methanogenic archaea, the Candidatus “Methanomethyliales” (phylum Candidatus “Verstraetearchaeota”), indicate that CH4 production through H2-dependent methylotrophic methanogenesis might also be an important CH4 source. Combined isotopic and modeling results clearly implied CH4 oxidation processes at one of the sampled locations, but due to the steep chemical gradients and the close proximity of the oxygen and nitrate reduction zones, no single electron acceptor for this process could be identified. Nevertheless, the numerical modeling results showed potential not only for aerobic CH4 oxidation but also for anaerobic oxidation of CH4 coupled to denitrification. In addition, the nitrate–methane transition zone was characterized by an increased relative abundance of microbial groups (Crenothrix, NC10) known to mediate nitrate and nitrite-dependent methane oxidation in the hyporheic zone. This study demonstrates substantial CH4 production in hyporheic sediments, a potential for aerobic and anaerobic CH4 oxidation, and underlines the high spatiotemporal variability in this habitat.

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“…S4). This finding is also consistent with previous reports from stream sediment incubations (Bodmer et al, 2020;Romeijn et al, 2019;Bednařík et al, 2019).…”

Section: Concentration Profiles Show Steep Geochemical Gradients and ...supporting

confidence: 94%

Section: Stable Carbon Isotopes Of Ch 4 Reveal the Importance Of Hydr...supporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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High-resolution vertical biogeochemical profiles in the hyporheic zone reveal insights into microbial methane cycling

et al. 2022

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“…Also, methane could be transported from the southern Lena catchment towards our study area, as is suggested for particulate organic matter (Winterfeld et al, 2015). At least during the warm season, methane production from (temperate) river sediments is possible (Bednařík et al, 2019). About the river-ice on the Lena there is no information yet available.…”

Section: Temperature Influence On Moxmentioning

confidence: 74%

Seasonal methane dynamics in three different Siberian water bodies

Bussmann

Fedorova

Juhls

et al. 2020

Preprint

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Abstract. Arctic regions and their water bodies are being affected by the most rapid climate warming on Earth. Arctic lakes and small ponds are known to act as an important source of atmospheric methane. However, not much is known about other types of water bodies in permafrost regions, which include major rivers and coastal bays as a transition type between freshwater and marine environments. We monitored dissolved methane concentrations in three different water bodies (Lena River, Tiksi Bay and Lake Golzovoye, Siberia, Russia) over a period of two years. Sampling was carried out under ice cover (April) and in open water (July/August). The methane oxidation (MOX) rate in water and melted ice samples from the late winter of 2017 was also investigated. In the Lena River winter methane concentrations were a quarter of the summer concentrations (8 vs 31 nmol L−1) and mean winter MOX rate was low (0.023 nmol L−1 d−1). In contrast, Tiksi Bay winter methane concentrations were 10-times higher than in summer (103 vs 13 nmol L−1). Winter MOX rates showed a median of 0.305 nmol L−1 d−1. In Lake Golzovoye, median methane concentrations in winter were 40-times higher than in summer (1957 vs 49 nmol L−1). However, MOX was much higher in the lake (2.95 nmol L−1 d−1) than in either the river or bay. The temperature had a strong influence on the MOX, (Q10 = 2.72 ± 0.69) compared to temperate environments. In the ice cores a median methane concentration of 9 nM was observed, with no gradient between the ice surface and the bottom layer at the ice-water-interface. MOX in the (melted) ice cores was mostly below the detection limit. Comparing methane concentrations in the ice with the underlaying water column revealed 100 – 1000-times higher methane concentration in the water column. The winter situation seemed to favor a methane accumulation under ice, especially in the lake with a stagnant water body. While on the other hand, in the Lena River with its flowing water no methane accumulation under ice was observed. Methane oxidation rate was not able to counteract this winter time accumulation.

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“…The prediction of potential functional pathways of microbial communities revealed that the abundance of pathways related to S, N, and CH 4 metabolism was lower in V. natansassociated sediments in May as compared to that of the control, indicating lower activities of the associated microorganisms. Previous studies have shown that methanogenic archaea are common in sediments [52], and CH 4 cycling processes are subject to large spatiotemporal heterogeneity [53], with high fluctuations in the abundance of methanotrophs [52]. Moreover, CH 4 dynamics have significant positive correlations with sediment total organic carbon, Fe(II), and Fe(III) contents [54], in addition to total phosphorus and soluble reactive phosphorus contents [55].…”

Section: Discussionmentioning

confidence: 98%

Mitigation of Eutrophication in a Shallow Lake: The Influences of Submerged Macrophytes on Phosphorus and Bacterial Community Structure in Sediments

et al. 2021

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Remediating water eutrophication is critical for maintaining healthy and sustainable development of lakes. The aim of this study was to explore the seasonal variation in phosphorus (P) speciation and bacterial community structure in sediments of Qin Lake (Taizhou, Jiangsu Province, China) associated with the growth of submerged macrophyte Vallisneria natans. The differences in sediment bacterial diversity and community structure between V. natans growing and control areas were analyzed over a period of one year. The results showed that V. natans growth reduced the total P and organic matter contents of the sediments and increased the bioavailable iron (Fe) and Fe-bound P contents. The α-diversity of sediment bacteria was significantly higher in the presence of V. natans than in the controls during the vigorous plant growth stage. In the presence of V. natans, there was a higher relative abundance of Proteobacteria and lower relative abundances of Chloroflexi and Acidobacteria. The Fe(II) content in the sediment had a larger influence on the spatial distribution of bacterial communities than sediment Fe-bound P, organic matter, and Fe(II) contents. V. natans growth could reshape sediment bacterial community structure in the shallow lake, which, in turn, enhanced P immobilization in the sediments and thereby improved the water quality.

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Sediment methane dynamics along the Elbe River

Cited by 9 publications

References 78 publications

High-resolution vertical biogeochemical profiles in the hyporheic zone reveal insights into microbial methane cycling

High-resolution vertical biogeochemical profiles in the hyporheic zone reveal insights into microbial methane cycling

Seasonal methane dynamics in three different Siberian water bodies

Mitigation of Eutrophication in a Shallow Lake: The Influences of Submerged Macrophytes on Phosphorus and Bacterial Community Structure in Sediments

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