Sulfate Mobility in Fen Peat and Its Impact on the Release of Solutes

Gosch, Lennart; Townsend, Heather; Kreuzburg, Matthias; Janssen, Manon; Rezanezhad, Fereidoun; Lennartz, Bernd

doi:10.3389/fenvs.2019.00189

Cited by 8 publications

(8 citation statements)

References 59 publications

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“…(iv) Qipengyuania holds the potential to utilize organosulfur compounds and inorganic phosphates as sulfur and phosphorus sources . Seawater and marine sediments contain a high concentration of sulfate ( 42 ). However, the genes related to assimilatory sulfate reduction were not detected in members of the genus Qipengyuania ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Comparative Genomics Reveals Genetic Diversity and Metabolic Potentials of the Genus Qipengyuania and Suggests Fifteen Novel Species

Liu

Pei

et al. 2022

Microbiol Spectr

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The deciphering of the phylogenetic diversity and metabolic features of the abundant bacterial taxa is critical for exploring their ecological importance and application potential. Qipengyuania is a genus of frequently isolated heterotrophic microorganisms with great industrial application potential. Numerous strains related to the genus Qipengyuania have been isolated from diverse environments, but their genomic diversity and metabolic functions remain unclear.

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Section: Resultsmentioning

confidence: 99%

Comparative Genomics Reveals Genetic Diversity and Metabolic Potentials of the Genus Qipengyuania and Suggests Fifteen Novel Species

Liu

Pei

et al. 2022

Microbiol Spectr

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“…Soil hydraulic parameters were then generated using the neural network prediction "Rosetta" incorporated into the Hydrus software (Schaap et al, 2001). Peat hydraulic parameters were calculated with the pedotransfer functions for sedge bulk density of ≤0.2 g cm −3 proposed by Liu and Lennartz (2019), based on measured bulk density ranging from 0.12 to 0.15 g cm −3 in the peatland (L. Gosch, personal communication, August 23, 2019) and 0.17 g cm −3 in the peat exposed at the coastline (Gosch et al, 2019). The residual water content for peat was assigned a value of 0.2.…”

Section: Soil Hydraulic Parametersmentioning

confidence: 99%

Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

et al. 2021

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Submarine groundwater discharge (SGD) is an important pathway for water and materials within the land-ocean transition zone that can impact coastal environments and marine life. Although research from sandy shorelines has rapidly advanced in recent years, there is very little understanding of coastal areas characterized by a low hydraulic conductivity, such as carbon-rich coastal peatlands. The objective of this study was to determine the magnitude and location of terrestrial SGD to be expected from a non-tidal low-lying coastal peatland located along the Baltic Sea and to understand the controlling factors using numerical modeling. We employed the HYDRUS-2D modeling package to simulate water movement under steady-state conditions in a transect that extends from the dune dike-separated rewetted fen to the shallow sea. Soil physical properties, hydraulic gradients, geological stratifications, and topography were varied to depict the range of properties encountered in coastal peatlands. Our results show that terrestrial SGD occurs at the study site at a flux of 0.080 m2 d−1, with seepage rates of 1.05 cm d−1 (upper discharge region) and 0.16 cm d−1 (lower discharge region above submerged peat layer). These calculated seepage rates compare to observations from other wetland environments and SGD sites in the Baltic Sea. The groundwater originates mainly from the dune dike—recharged by precipitation and infiltration from ponded peatland surface water—and to a lesser extent from the sand aquifer. The scenario simulations yielded a range of potential SGD fluxes of 0.008–0.293 m2 d−1. They revealed that the location of terrestrial SGD is determined by the barrier function of the peat layer extending under the sea. However, it has little impact on volume flux as most SGD occurs near the shoreline. Magnitude of SGD is mainly driven by hydraulic gradient and the hydraulic conductivity of peat and beach/dune sands. Anisotropy in the horizontal direction, aquifer and peat thickness, and peatland elevation have little impacts on SGD. We conclude that SGD is most probable from coastal peatlands with high water levels, large Ks and/or a dune dike or belt, which could be an essential source for carbon and other materials via the SGD pathway.

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“…The beach area has been subject to beach nourishments, wooden groynes were installed to retain the sand and a dyke was constructed after several wash‐over events (Kolp 1957; Voigtländer et al 1996). The shoreline is covered by permeable heterogeneous sediments except for areas with peat deposits (Hübner and Gräff 2013; Kreuzburg et al 2018), which are only low‐permeable substratum (Gosch et al 2019).…”

Section: Study Sitementioning

confidence: 99%

“…Other pathways of methane production results from acetate degradation (e.g., CH 3 COOH → CO 2 + CH 4 ) (Deppenmeier 2002). The production of CH 4 , however, is closely related to

{SO}_{4}^{2 -}

reduction, which is the dominating metabolic process of DOC mineralization in anoxic marine sediments (Zehnder and Mitchell 1978; Gosch et al 2019). Sulfate‐reducing bacteria (SRB) are generally able to successfully outcompete methanogens during organic matter degradation (Whiticar 2002).…”

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confidence: 99%

Carbon release and transformation from coastal peat deposits controlled by submarine groundwater discharge: a column experiment study

Kreuzburg

Rezanezhad

Milojevic

et al. 2020

Limnology & Oceanography

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Although the majority of coastal sediments consist of sandy material, in some areas marine ingression caused the submergence of terrestrial carbon-rich peat soils. This affects the coastal carbon balance, as peat represents a potential carbon source. We performed a column experiment to better understand the coupled flow and biogeochemical processes governing carbon transformations in submerged peat under coastal fresh groundwater (GW) discharge and brackish water intrusion. The columns contained naturally layered sediments with and without peat (organic carbon content in peat 39 AE 14 wt%), alternately supplied with oxygen-rich brackish water from above and oxygen-poor, low-saline GW from below. The low-saline GW discharge through the peat significantly increased the release and ascent of dissolved organic carbon (DOC) from the peat (δ 13 C DOC − 26.9‰ to − 27.7‰), which was accompanied by the production of dissolved inorganic carbon (DIC) and emission of carbon dioxide (CO 2 ), implying DOC mineralization. Oxygen respiration, sulfate (SO 2 − 4 ) reduction, and methane (CH 4 ) formation were differently pronounced in the sediments and were accompanied with higher microbial abundances in peat compared to sand with SO 2 − 4 -reducing bacteria clearly dominating methanogens. With decreasing salinity and SO 2− 4 concentrations, CH 4 emission rates increased from 16.5 to 77.3 μmol m −2 d −1 during a 14-day, low-saline GW discharge phase. In contrast, oxygenated brackish water intrusion resulted in lower DOC and DIC pore water concentrations and significantly lower CH 4 and CO 2 emissions. Our study illustrates the strong dependence of carbon cycling in shallow coastal areas with submerged peat deposits on the flow and mixing dynamics within the subterranean estuary.Sea-level rise is considered to be one of the main impacts of climate change, with significant implications for mineralization processes within coastal wetlands (Nicholls and Cazenave 2010;Neubauer 2013;Plag and Jules-Plag 2013;Hahn et al. 2015;Wang et al. 2016). In particular, coastline retreat may cause submergence of terrestrial, organic carbonrich peat sediments. The extent of submarine peat and the process-based impacts on carbon transformation processes and exchange of trace gases in shallow coastal areas have been poorly addressed. Sediment column experiments are powerful tools to investigate subprocesses and simulate changes of environmental and hydrological conditions. These changes are accelerated by land subsidence of peatland caused by their large-scale drainage for agricultural use. Land subsidence alters the hydrologic exchange processes across the land-sea interface (Nieuwenhuis and Schokking 1997;Hooijer et al. 2012) including changes in surficial runoff, subsurface mixing, and submarine groundwater discharge (SGD).SGD is comprised of all flow of water from the seabed into the coastal ocean, predominantly recirculated seawater (SW), driven by wave action, density gradients, and sea-level dynamics (Robinson et al.

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Sulfate Mobility in Fen Peat and Its Impact on the Release of Solutes

Cited by 8 publications

References 59 publications

Comparative Genomics Reveals Genetic Diversity and Metabolic Potentials of the Genus Qipengyuania and Suggests Fifteen Novel Species

Comparative Genomics Reveals Genetic Diversity and Metabolic Potentials of the Genus Qipengyuania and Suggests Fifteen Novel Species

Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

Carbon release and transformation from coastal peat deposits controlled by submarine groundwater discharge: a column experiment study

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