The impact of long-term water level draw-down on microbial biomass: A comparative study from two peatland sites with different nutrient status

Mpamah, Promise; Taipale, Sami J.; Rissanen, Antti J.; Biasi, Christina; Nykänen, Hannu

doi:10.1016/j.ejsobi.2017.04.005

Cited by 22 publications

(15 citation statements)

References 49 publications

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“…Total lipids of the freeze-dried samples were extracted and fractionated into neutral, glyco-, and phospholipids, and the phospholipid fraction was analyzed as explained before (Bligh and Dyer 1959; Mpamah et al . 2017). The amount (µg fatty acids g −1 dw) of BrFA (sum of i14:0, i15:0, a15:0, i16:0, i17:0, a17:0 and i18:0) was used as a biomarker of living bacterial biomass.…”

Section: Methodsmentioning

confidence: 99%

Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake

Rissanen

Peura

Mpamah

et al. 2019

FEMS Microbiology Letters

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Although sediments of small boreal humic lakes are important carbon stores and greenhouse gas sources, the composition and structuring mechanisms of their microbial communities have remained understudied. We analyzed the vertical profiles of microbial biomass indicators (PLFAs, DNA and RNA) and the bacterial and archaeal community composition (sequencing of 16S rRNA gene amplicons and qPCR of mcrA ) in sediment cores collected from a typical small boreal lake. While microbial biomass decreased with sediment depth, viable microbes (RNA and PLFA) were present all through the profiles. The vertical stratification patterns of the bacterial and archaeal communities resembled those in marine sediments with well-characterized groups (e.g. Methanomicrobia , Proteobacteria , Cyanobacteria , Bacteroidetes ) dominating in the surface sediment and being replaced by poorly-known groups (e.g. Bathyarchaeota , Aminicenantes and Caldiserica ) in the deeper layers. The results also suggested that, similar to marine systems, the deep bacterial and archaeal communities were predominantly assembled by selective survival of taxa able to persist in the low energy conditions. Methanotrophs were rare, further corroborating the role of these methanogen-rich sediments as important methane emitters. Based on their taxonomy, the deep-dwelling groups were putatively organo-heterotrophic, organo-autotrophic and/or acetogenic and thus may contribute to changes in the lake sediment carbon storage.

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Section: Methodsmentioning

confidence: 99%

Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake

Rissanen

Peura

Mpamah

et al. 2019

FEMS Microbiology Letters

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“…In fens, members of the phyla Proteobacteria and Bacteroidetes have been shown to be particularly sensitive to drought, as well as protists of the phylum Rhizaria and ectomycorrhizal fungi (Peltoniemi et al, 2012;Potter et al, 2017). Drainage of fens has been shown to increase microbial activity and modify the active microbial community (Strakova et al, 2011;Mpamah et al, 2017); this is driven by a change in litter type (Peltoniemi et al, 2012) and exhibits a nonlinear response to water-table drawdown (Jassey et al, 2018). Peltoniemi et al (2015) examined the interaction of warming and drainage status on microbial activity in two boreal fens.…”

Section: Wider Microbial Communitymentioning

confidence: 99%

The Response of Microbial Communities to Peatland Drainage and Rewetting. A Review

Kitson

Bell

2020

Front. Microbiol.

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Peatlands are significant global carbon stores and play an important role in mediating the flux of greenhouse gasses into the atmosphere. During the 20th century substantial areas of northern peatlands were drained to repurpose the land for industrial or agricultural use. Drained peatlands have dysfunctional microbial communities, which can lead to net carbon emissions. Rewetting of drained peatlands is therefore an environmental priority, yet our understanding of the effects of peatland drainage and rewetting on microbial communities is still incomplete. Here we summarize the last decade of research into the response of the wider microbial community, methanecycling microorganisms, and micro-fauna to drainage and rewetting in fens and bogs in Europe and North America. Emphasis is placed on current research methodologies and their limitations. We propose targets for future work including: accounting for timescale of drainage and rewetting events; better vertical and lateral coverage of samples across a peatland; the integration of proteomic and metabolomic datasets into functional community analysis; the use of RNA sequencing to differentiate the active community from legacy DNA; and further study into the response of the viral and micro-faunal communities to peatland drainage and rewetting. This review should benefit researchers embarking on studies in wetland microbiology and non-microbiologists working on peatland drainage and rewetting in general.

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“…Many studies have shown that drainage affects C and N mineralization processes in peatland, helping to shift it between serving as a sink or source (Chen et al, 2012; Chimner et al, 2017; Laine, Makiranta, et al, 2019; Zhang et al, 2020). Fluctuation in the watertable can directly affect soil biogeochemical properties, including soil physical and chemical properties, soil substrate, microbial community, and enzyme activity, ultimately altering GHG emissions (de Vries et al, 2018; Mpamah et al, 2017; Swails et al, 2018; Wen et al, 2019). DOC and TDN concentrations reflect the balance between SOM production and consumption by microbes, which decompose DOC and TDN into GHG (van den Berg et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

How do water table drawdown, duration of drainage, and warming influence greenhouse gas emissions from drained peatlands of the Zoige Plateau?

et al. 2021

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Alpine peatlands on the Qinghai‐Tibet Plateau are an important soil carbon pool and are extremely sensitive to global change. Duration of drainage and water table drawdown accelerate peatland degradation because the soil changes from an anaerobic to aerobic environment, and climate warming exacerbates this shift. The objective of the present study was to evaluate the effects of drainage on microbial characteristics and greenhouse gas (GHG) emissions, as well as identify the factors mediating those effects. This study also analyzed whether warming increases the variability of GHG emissions. Watertable drawdown exerted greater influence on microbial communities than duration of drainage did. Watertable drawdown significantly increased the relative abundances of Proteobacteria, Acidobacteria, Actinobacteria, and Basidiomycota, and changes in soil microbiota correlated with differences in GHG emissions across three water‐table treatments. Longer drainage was associated with lower GHG emission; watertable drawdown decreased emissions of CO2 and CH4, but increased emission of N2O. In addition, high temperature increased CO2 emission by 75% and N2O emission by 42%, without significantly affecting CH4 emission. Structural equation modelling showed that microbes, especially prokaryotes (r = 0.79, p < 0.05 for all), were the primary factor affecting GHG emissions from drained peatlands. Overall, this study indicates that the watertable exerts a greater effect on GHG emissions than duration of drainage, and that warming increases variability of GHG emissions.

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The impact of long-term water level draw-down on microbial biomass: A comparative study from two peatland sites with different nutrient status

Abstract: The impact of long-term water level draw-down on general microbial biomass: a comparative study from two peatland sites with different nutrient status

Cited by 22 publications

References 49 publications

Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake

Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake

The Response of Microbial Communities to Peatland Drainage and Rewetting. A Review

How do water table drawdown, duration of drainage, and warming influence greenhouse gas emissions from drained peatlands of the Zoige Plateau?

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