Changes in microbial community composition, activity, and greenhouse gas production upon inundation of drained iron-rich peat soils

A, de Jong; Guererro-Cruz, Simon; Diggelen, J.M.H. van; Vaksmaa, Annika; Lamers, Leon P. M.; Jetten, Mike S. M.; Smolders, Alfons J. P.; Rasigraf, Olivia

doi:10.1016/j.soilbio.2020.107862

Cited by 13 publications

(8 citation statements)

References 107 publications

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“…We found few samples with Eh values within the Eh range of breakpoints detected for NO 3 and Mn(II) (366 and 685 mV, Fig. S4c), which can be explained by a high rate of NO 3 consumption (Bougon et al, 2011;de Jong et al, 2020) and the low amount of available Mn(II) (< 100 µmol/L) in most soils. Therefore, and because of overlapping breakpoint estimations for NO 3 − and Mn(II), we decided to merge these two metabolic processes in our further analyses.…”

Section: Eh and Metabolic Processesmentioning

confidence: 83%

“…As Eh is dependent on electron acceptor availability, it re ects inundation time, water lled pore space, microbial activity and the availability of reactive organic matter (Cogger et al, 1992;Tokarz and Urban, 2015). Furthermore, redox potential can be linked to the production of greenhouse gasses and soil nutrient leaching to surface waters (Koerselman et al, 1993;Yu et al, 2007;Boomer and Bedford, 2008;Knorr et al, 2009;Kjaergaard et al, 2012;Rubol et al, 2012;de Jong et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Peatland porewater chemistry reveals field redox ranges for specific decomposition processes

Boonman

Harpenslager²,

Dijk³

et al. 2023

Preprint

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Peat decomposition, driven by soil metabolic processes, was responsible for 2% of the anthropogenic greenhouse gas emissions in 2019. The peat soil redox potential (Eh) and pH reflect the chemical state of the soil and the (biogeo)chemical processes that occur and are therefore linked to the rate of peat decomposition and greenhouse gas production. We related porewater chemistry (pH, NO3-, SO42-, Mn(II), Fe(II), S2- and CH4, >2000 samples) to continuous Eh measurements (2020-2022) from five agricultural drained peatland sites in the Netherlands that consist of measuring plots with and without subsoil irrigation and drainage (SSI) in order to establish Eh ranges that identify specific metabolic processes. We found that methanogenesis, reduction of SO42-, Fe(III), NO3-/ Mn(IV) and O2 occurred at Eh (at pH 5.5) of < -49 mV, -49 – 104 mV, 104- 364 mV, 364- 700 mV and >700mV respectively. Eh over depth and time closely followed temporal and spatial fluctuations in groundwater level and porewater chemistry, and revealed the extent of O2 intrusion and the occurrence of methanogenesis. Higher and more constant groundwater levels year-round tended to deplete porewater Fe(II) and SO42-, which led to more reducing Eh and higher porewater CH4 concentrations. These mechanistic insights help to optimize GHG mitigation strategies for drained peat regions.

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Section: Eh and Metabolic Processesmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Peatland porewater chemistry reveals field redox ranges for specific decomposition processes

Boonman

Harpenslager²,

Dijk³

et al. 2023

Preprint

Self Cite

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“…N addition may also stimulate methanogenesis in deeper soil. However, inhibition of methanogenesis by N in various wet ecosystems has been demonstrated , and development of the nutritional effects of added N on slow-growing methanogens would take longer than the direct inhibitory effects on methanotrophs, suggesting that reduced CH 4 oxidation in surface soil is primarily responsible for the enhanced emission of CH 4 in fertilized treatment.…”

Section: Discussionmentioning

confidence: 99%

Attenuation of Methane Oxidation by Nitrogen Availability in Arctic Tundra Soils

Lee

Yun

Yang

et al. 2023

Environ. Sci. Technol.

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CH4 emission in the Arctic has large uncertainty due to the lack of mechanistic understanding of the processes. CH4 oxidation in Arctic soil plays a critical role in the process, whereby removal of up to 90% of CH4 produced in soils by methanotrophs can occur before it reaches the atmosphere. Previous studies have reported on the importance of rising temperatures in CH4 oxidation, but because the Arctic is typically an N-limited system, fewer studies on the effects of inorganic nitrogen (N) have been reported. However, climate change and an increase of available N caused by anthropogenic activities have recently been reported, which may cause a drastic change in CH4 oxidation in Arctic soils. In this study, we demonstrate that excessive levels of available N in soil cause an increase in net CH4 emissions via the reduction of CH4 oxidation in surface soil in the Arctic tundra. In vitro experiments suggested that N in the form of NO3 – is responsible for the decrease in CH4 oxidation via influencing soil bacterial and methanotrophic communities. The findings of our meta-analysis suggest that CH4 oxidation in the boreal biome is more susceptible to the addition of N than in other biomes. We provide evidence that CH4 emissions in Arctic tundra can be enhanced by an increase of available N, with profound implications for modeling CH4 dynamics in Arctic regions.

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“…The rise in the water table that results from these management actions leads to an exclusion of oxygen from the peat below the water surface (Estop‐Aragones et al, 2012 ), which in turn inhibits the activity of aerobic microorganisms (Rydin & Jeglum, 2006 ), thereby reducing CO 2 production. Conversely, the anoxic conditions provide suitable conditions for methanogenic activity (de Jong et al, 2020 ; Wen et al, 2018 ) and CH 4 emissions generally increase after rewetting (IPCC, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Carbon and climate implications of rewetting a raised bog in Ireland

Wilson

Mackin²,

Tuovinen

et al. 2022

Global Change Biology

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Peatland rewetting has been proposed as a vital climate change mitigation tool to reduce greenhouse gas emissions and to generate suitable conditions for the return of carbon (C) sequestration. In this study, we present annual C balances for a 5-year period at a rewetted peatland in Ireland (rewetted at the start of the study) and compare the results with an adjacent drained area (represents business-as-usual). Hydrological modelling of the 230-hectare site was carried out to determine the likely ecotopes (vegetation communities) that will develop post-rewetting and was used to inform a radiative forcing modelling exercise to determine the climate impacts of rewetting this peatland under five high-priority scenarios (SSP1-1.9, SS1-2.6, SSP2-4.5, SSP3-7.0 and SSP5-8.5). The drained area (marginal ecotope) was a net C source throughout the study and emitted 157 ± 25.5 g C m −2 year −1 . In contrast, the rewetted area (sub-central ecotope) was a net C sink of 78.0 ± 37.6 g C m −2 year −1 , despite relatively large annual methane emissions post-rewetting (average 19.3 ± 5.2 g C m −2 year −1 ). Hydrological modelling predicted the development of three key ecotopes at the site, with the subcentral ecotope predicted to cover 24% of the site, the sub-marginal predicted to cover 59% and the marginal predicted to cover 16%. Using these areal estimates, our radiative forcing modelling projects that under the SSP1-1.9 scenario, the site will have a warming effect on the climate until 2085 but will then have a strong cooling impact. In contrast, our modelling exercise shows that the site will never have a cooling impact under the SSP5-8.5 scenario. Our results confirm the importance of rapid rewetting of drained peatland sites to (a) achieve strong C emissions reductions, (b) establish optimal conditions for C sequestration and (c) set the site on a climate cooling trajectory.

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Changes in microbial community composition, activity, and greenhouse gas production upon inundation of drained iron-rich peat soils

Cited by 13 publications

References 107 publications

Peatland porewater chemistry reveals field redox ranges for specific decomposition processes

Peatland porewater chemistry reveals field redox ranges for specific decomposition processes

Attenuation of Methane Oxidation by Nitrogen Availability in Arctic Tundra Soils

Carbon and climate implications of rewetting a raised bog in Ireland

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