Recovery of methanogenic community and its activity in long-term drained peatlands after rewetting

Urbanová, Zuzana; Bárta, Jiří

doi:10.1016/j.ecoleng.2020.105852

Cited by 20 publications

(19 citation statements)

References 47 publications

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“…Plant community composition controls litterfall quality. Long-term water saturation caused by rewetting promotes gradual changes in plant communities (Urbanová and Bárta, 2020). Peat soils characterized by high mineral nutrient, medium pH, low soil oxygen content and high soil water content promote plant communities dominated by specialized vascular plants such as wetland sedges (Carex spp.)…”

Section: Soil Oxygen Soil Ph Nutrient Contents and Litterfall Qualitymentioning

confidence: 99%

“…Both acetogenic and fermentative bacteria respond positively to decreases in soil oxygen associated with rewetting (Galand et al, 2005;Bräuer et al, 2020). Methanogenic activity is enhanced by organic substrate availability, therefore is highly dependent of plant community through litterfall quantity and quality (Putkinen et al, 2018;Urbanová and Bárta, 2020).…”

Section: Carbon Mineralization Pathwaysmentioning

confidence: 99%

“…However, some hydrogenotrophic methanogens respond better to nutrient poor and acidic conditions which explain their importance in bogs (Galand et al, 2005;Bräuer et al, 2020). Furthermore, some hydrogenotrophic methanogens seem to be more tolerant to oxygen giving them an advantage in drained or not fully restored peatlands (Urbanová and Bárta, 2020).…”

Section: Carbon Mineralization Pathwaysmentioning

confidence: 99%

See 2 more Smart Citations

Back to the Future: Restoring Northern Drained Forested Peatlands for Climate Change Mitigation

Escobar

Belyazid

Manzoni

2022

Front. Environ. Sci.

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Draining peatlands for forestry in the northern hemisphere turns their soils from carbon sinks to substantial sources of greenhouse gases (GHGs). To reverse this trend, rewetting has been proposed as a climate change mitigation strategy. We performed a literature review to assess the empirical evidence supporting the hypothesis that rewetting drained forested peatlands can turn them back into carbon sinks. We also used causal loop diagrams (CLDs) to synthesize the current knowledge of how water table management affects GHG emissions in organic soils. We found an increasing number of studies from the last decade comparing GHG emissions from rewetted, previously forested peatlands, with forested or pristine peatlands. However, comparative field studies usually report relatively short time series following rewetting experiments (e.g., 3 years of measurements and around 10 years after rewetting). Empirical evidence shows that rewetting leads to lower GHG emissions from soils. However, reports of carbon sinks in rewetted systems are scarce in the reviewed literature. Moreover, CH4 emissions in rewetted peatlands are commonly reported to be higher than in pristine peatlands. Long-term water table changes associated with rewetting lead to a cascade of effects in different processes regulating GHG emissions. The water table level affects litterfall quantity and quality by altering the plant community; it also affects organic matter breakdown rates, carbon and nitrogen mineralization pathways and rates, as well as gas transport mechanisms. Finally, we conceptualized three phases of restoration following the rewetting of previously drained and forested peatlands, we described the time dependent responses of soil, vegetation and GHG emissions to rewetting, concluding that while short-term gains in the GHG balance can be minimal, the long-term potential of restoring drained peatlands through rewetting remains promising.

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Section: Soil Oxygen Soil Ph Nutrient Contents and Litterfall Qualitymentioning

confidence: 99%

Section: Carbon Mineralization Pathwaysmentioning

confidence: 99%

Section: Carbon Mineralization Pathwaysmentioning

confidence: 99%

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Back to the Future: Restoring Northern Drained Forested Peatlands for Climate Change Mitigation

Escobar

Belyazid

Manzoni

2022

Front. Environ. Sci.

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“…In addition to abiotic properties, biotic properties, such as the microbial population, also change. The methanogen community, for example, increased in the rewetted peatland, while the methanotroph community decreased [21]. Likewise, in the rewetted condition, the vegetation composition becomes more adaptable to the rewetted condition [22][23][24].…”

Section: Introductionmentioning

confidence: 96%

Carbon Dynamics in Rewetted Tropical Peat Swamp Forests

Darusman

Murdiyarso

Impron

et al. 2022

Climate

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Degraded and drained peat swamp forests (PSFs) are major sources of carbon emissions in the forestry sector. Rewetting interventions aim to reduce carbon loss and to enhance the carbon stock. However, studies of rewetting interventions in tropical PSFs are still limited. This study examined the effect of rewetting interventions on carbon dynamics at a rewetted site and an undrained site. We measured aboveground carbon (AGC), belowground carbon (BGC), litterfall, heterotrophic components of soil respiration (Rh), methane emissions (CH4), and dissolved organic carbon (DOC) concentration at both sites. We found that the total carbon stock at the rewetted site was slightly lower than at the undrained site (1886.73 ± 87.69 and 2106.23 ± 214.33 Mg C ha−1, respectively). The soil organic carbon (SOC) was 1685 ± 61 Mg C ha−1 and 1912 ± 190 Mg C ha−1 at the rewetted and undrained sites, respectively, and the carbon from litterfall was 4.68 ± 0.30 and 3.92 ± 0.34 Mg C ha−1 year−1, respectively. The annual average Rh was 4.06 ± 0.02 Mg C ha−1 year−1 at the rewetted site and was 3.96 ± 0.16 Mg C ha−1 year−1 at the undrained site. In contrast, the annual average CH4 emissions were −0.0015 ± 0.00 Mg C ha−1 year−1 at the rewetted site and 0.056 ± 0.000 Mg C ha−1 year−1 at the undrained site. In the rewetted condition, carbon from litter may become stable over a longer period. Consequently, carbon loss and gain mainly depend on the magnitude of peat decomposition (Rh) and CH4 emissions.

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“…The composition of prokaryotic microbiomes in general were significantly shaped by rewetting (Emsens et al, 2020; Weil et al, 2020), associated with an increased relative abundance of anerobic microbial groups in rewetted fens (Weil et al, 2020). Studies on rewetted peatlands also focus on the methane emissions and associated methanogens (Urbanová and Bárta 2020; Wen et al, 2018), as increased methane emissions are a major concern after rewetting. Despite of the rise in the research interest on peat microbiomes, the majority of the ecological roles of microbiomes still remains under-characterized in rewetted peatlands, especially in fen peatlands whose pristine states are not even well understood (Jurasinski et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

Eukaryotic rather than prokaryotic microbiomes change over seasons in rewetted fen peatlands

Wang

Weil

Dumack

et al. 2020

Preprint

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23Background: Drainage of high-organic peatlands for agricultural purposes has led to increased greenhouse 24 gas emissions and loss of biodiversity. In the last decades, rewetting of peatlands is on the rise worldwide, 25 to mitigate these negative impacts. However, it remains still questionable how rewetting would influence 26 peat microbiota as important drivers of nutrient cycles and ecosystem restoration. Here, we investigate the 27 spatial and temporal dynamics of the diversity, community composition and network interactions of 28 prokaryotes and eukaryotes, and the influence of rewetting on these microbial features in formerly long-29 term drained and agriculturally used fens. Peat-soils were sampled seasonally from three drained and three 30 rewetted sites representing the dominating fen peatland types of glacial landscapes in Northern Germany, 31 namely alder forest, costal fen and percolation fen. 32Results: Costal fens as salt-water impacted systems showed a lower microbial diversity and their microbial 33 community composition showed the strongest distinction from the other two peatland types. Prokaryotic 34 and eukaryotic community compositions showed a congruent pattern which was mostly driven by peatland 35 type and rewetting. Rewetting decreased the abundances of fungi and prokaryotic decomposers, while the 36 abundance of potential methanogens was significantly higher in the rewetted sites. Rewetting also 37 influenced the abundance of ecological clusters in the microbial communities identified from the co-38 occurrence network. The microbial communities changed only slightly with depth and over time. According 39 to structural equation models rewetted conditions affected the microbial communities through different 40 mechanisms across the three studied peatland types. 41 Conclusions:Our results suggest that rewetting strongly impacts the structure of microbial communities 42 and, thus, important biogeochemical processes, which may explain the high variation in greenhouse gas 43 emissions upon rewetting of peatlands. The improved understanding of functional mechanisms of rewetting 44 in different peatland types lays the foundation for securing best practices to fulfil multiple restoration goals 45 including those targeting on climate, water, and species protection. 46

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Recovery of methanogenic community and its activity in long-term drained peatlands after rewetting

Cited by 20 publications

References 47 publications

Back to the Future: Restoring Northern Drained Forested Peatlands for Climate Change Mitigation

Back to the Future: Restoring Northern Drained Forested Peatlands for Climate Change Mitigation

Carbon Dynamics in Rewetted Tropical Peat Swamp Forests

Eukaryotic rather than prokaryotic microbiomes change over seasons in rewetted fen peatlands

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