Salt effects on carbon mineralization in southeastern coastal wetland soils of the United States

Wen, Yongli; Bernhardt, Emily S.; Deng, Wenbo; Liu, Wenjuan; Yan, Jun; Baruch, Ethan M.; Bergemann, Christina M.

doi:10.1016/j.geoderma.2018.12.035

Cited by 24 publications

(11 citation statements)

References 39 publications

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“…Additionally, soil salinity is an especially important factor in salt marsh, which could alter the microbial processes, and change the future carbon sequestration (Wilson et al, 2015;Wen et al, 2019). Salinization causes higher Na þ , Cl À and SO 4 2À concentrations in soils.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, high salinity can reduce soil CH 4 emissions, which probably because sulfate reducing bacteria (desulfovibrio desulfuricans) usually compete with methanogens for use of substrates to inhibit methanogens (Olsson et al, 2015). Therefore, soil salinity is an important environmental factor in affecting the rate of C cycling in coastal wetlands (Wilson et al, 2015;Servais et al, 2019;Wen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

Zhao

Han

et al. 2020

Journal of Cleaner Production

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

Zhao

Han

et al. 2020

Journal of Cleaner Production

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“…The molecular data are mostly dependent on the choice of primers. Although the primers used in this study are well evaluated and have been applied for estimating the abundance of methanogens (Wen et al 2018) and sulfate reducers (Vuillemin et al 2018), the primers used are covering only a small diversity of microorganisms involved in the complex biogeochemical processes. However, the total abundance of microorganisms across the sediment columns has identified the peat as the favorable habitat.…”

Section: Discussionmentioning

confidence: 99%

“…DNA concentrations were quantified with a Nanophotometer P360 (Implen GmbH) and Qubit 2.0 Fluorometer (Thermo Fisher Scientific). Quantitative polymerase chain reaction (qPCR) for the determination of functional gene copy numbers of methanogenic archaea and SRB was performed via SybrGreen assays on a Bio‐Rad CFX instrument (Bio‐Rad) as described elsewhere (Vuillemin et al 2018; Wen et al 2018) with slight modifications. In detail, the methyl coenzyme M reductase alpha subunit ( mcrA ) as the functional methanogenic gene was amplified with the primer combination mlas‐F/mcra‐R ( ggT gTM ggD TTC ACM CAR TA / CgT TCA TBg CgT AgT TVg gRT AgT ) with primer annealing at 60°C.…”

Section: Methodsmentioning

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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“…This may be due to the protection of labile compounds by biochar and/or the removal of biochar compounds, which inhibited microbial activity and thus C-mineralization from compost (see above). Indeed, fresh biochar may contain large amounts of salts, which may inhibit microbial activity when applied to soil [49][50][51]. This could lead to the negative priming effect of biochar on native C often observed immediately after soil addition [52].…”

Section: Effect Of Weathering On the Biological Stabilitymentioning

confidence: 99%

Biochar-Compost Interactions as Affected by Weathering: Effects on Biological Stability and Plant Growth

et al. 2021

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Biochar addition to compost is of growing interest as soil amendment. However, little is known about the evolution of material properties of biochar-compost mixtures and their effect on plants after exposure to physical weathering. This study aimed to investigate the physico-chemical characteristics of fresh and weathered biochar-compost mixtures, their biological stability and their effect on ryegrass growth. To this end, we used the contrasting stable isotope signatures of biochar and compost to follow their behavior in biochar-compost mixtures subjected to artificial weathering during 1-year of incubation. We assessed their impact on ryegrass growth during a 4-week greenhouse pot experiment. Weathering treatment resulted in strong leaching of labile compounds. However, biochar-compost interactions led to reduced mass loss and fixed carbon retention during weathering of mixtures. Moreover, weathering increased carbon mineralization of biochar-compost mixtures, probably due to the protection of labile compounds from compost within biochar structure, as well as leaching of labile biochar compounds inhibiting microbial activity. After soil application, weathered mixtures could have positive effects on biomass production. We conclude that biochar-compost interactions on soil microbial activity and plant growth are evolving after physical weathering depending on biochar production conditions.

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Salt effects on carbon mineralization in southeastern coastal wetland soils of the United States

Cited by 24 publications

References 39 publications

Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

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

Biochar-Compost Interactions as Affected by Weathering: Effects on Biological Stability and Plant Growth

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