Responses of methanogenic and methanotrophic communities to warming in varying moisture regimes of two boreal fens

Peltoniemi, Krista; Laiho, Raija; Juottonen, Heli; Bodrossy, Levente; Kell, Dana K.; Minkkinen, Kari; Mäkiranta, Päivi; Mehtätalo, Lauri; Penttilä, Timo; Siljanen, Henri; Tuittila, Eeva‐Stiina; Tuomivirta, Tero; Fritze, Hannu

doi:10.1016/j.soilbio.2016.03.007

Cited by 91 publications

(62 citation statements)

References 69 publications

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“…The lower BGBP and shoot versus root allocation in the wet areas of the northern fen probably reflect the slightly wetter conditions with a more steady input of relatively nutrient‐rich water than in the southern fen. Generally, the differences in the response patterns of both plant and microbial (Peltoniemi et al., , ) communities in our two boreal fens suggest that no generalizations should be made based on a small number of sites. This makes research on climate change responses quite challenging, since work on multiple sites during multiple years is required.…”

Section: Discussionmentioning

confidence: 77%

“…The lower BGBP and shoot versus root allocation in the wet areas of the northern fen probably reflect the slightly wetter conditions with a more steady input of relatively nutrient-rich water than in the southern fen. Generally, the differences in the response patterns of both plant and microbial (Peltoniemi et al, 2015(Peltoniemi et al, , 2016 (Van Breemen, 1995). The responses of fen vegetation to changing environmental conditions generally differ from those of bog vegetation (e.g., Weltzin et al, 2000Weltzin et al, , 2003.…”

Section: Discussionmentioning

confidence: 99%

“…The sites and the experimental setup (Figure ) that followed a split‐plot design have been described in detail by Peltoniemi et al. (, ). There were two WL regimes (whole plots; not replicated within sites): (1) wet (ambient) and (2) water‐level drawdown (WLD) induced by digging a shallow ditch around the WLD plots.…”

Section: Methodsmentioning

confidence: 99%

“…We further expected the PFT responses and net responses to differ between wet and dry conditions. Both "wet" and "dry" relate to typical conditions in boreal sedge fens, that is, wet means current hydrological conditions where the WL is within The sites and the experimental setup ( Figure 1) that followed a splitplot design have been described in detail by Peltoniemi et al (2015Peltoniemi et al ( , 2016. There were two WL regimes (whole plots; not replicated within sites): (1) wet (ambient) and (2) water-level drawdown (WLD) induced by digging a shallow ditch around the WLD plots.…”

Section: Introductionmentioning

confidence: 99%

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Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Mäkiranta

Laiho

Mehtätalo

et al. 2017

Global Change Biology

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Climate change affects peatlands directly through increased air temperatures and indirectly through changes in water-table level (WL). The interactions of these two still remain poorly known. We determined experimentally the separate and interactive effects of temperature and WL regime on factors of relevance for the inputs to the carbon cycle: plant community composition, phenology, biomass production, and shoot:root allocation in two wet boreal sedge-dominated fens, "southern" at 62°N and "northern" at 68°Ν. Warming (1.5°C higher average daily air temperature) was induced with open-top chambers and WL drawdown (WLD; 3-7 cm on average) by shallow ditches. Total biomass production varied from 250 to 520 g/m , with belowground production comprising 25%-63%. Warming was associated with minor effects on phenology and negligible effects on community composition, biomass production, and allocation. WLD clearly affected the contribution of different plant functional types (PFTs) in the community and the biomass they produced: shrubs benefited while forbs and mosses suffered. These responses did not depend on the warming treatment. Following WLD, aboveground biomass production decreased mainly due to reduced growth of mosses in the southern fen. Aboveground vascular plant biomass production remained unchanged but the contribution of different PFTs changed. The observed changes were also reflected in plant phenology, with different PFTs showing different responses. Belowground production increased following WLD in the northern fen only, but an increase in the contributions of shrubs and forbs was observed in both sites, while sedge contribution decreased. Moderate warming alone seems not able to drive significant changes in plant productivity or community composition in these wet ecosystems. However, if warming is accompanied by even modest WL drawdown, changes should be expected in the relative contribution of PFTs, which could lead to profound changes in the function of fens. Consequently, hydrological scenarios are of utmost importance when estimating their future function.

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Section: Discussionmentioning

confidence: 77%

“…The lower BGBP and shoot versus root allocation in the wet areas of the northern fen probably reflect the slightly wetter conditions with a more steady input of relatively nutrient-rich water than in the southern fen. Generally, the differences in the response patterns of both plant and microbial (Peltoniemi et al, 2015(Peltoniemi et al, , 2016 (Van Breemen, 1995). The responses of fen vegetation to changing environmental conditions generally differ from those of bog vegetation (e.g., Weltzin et al, 2000Weltzin et al, , 2003.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Mäkiranta

Laiho

Mehtätalo

et al. 2017

Global Change Biology

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123

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“…Thus, the lack of a significant temperature effect on CH 4 emissions in our study may be partly explained by the assumed (but not measured) minimal effect of warming on water table level in this ecosystem that received continuous supply of water from snowdrifts. A study from a Finnish peatland showed concurrently that changes in water table affected CH 4 emissions more than a 0.8°C soil temperature increase induced by OTCs [Peltoniemi et al, 2016]. That study also found that the warming treatment decreased ecosystem CH 4 emissions, possibly due to decreased methanogen abundance and CH 4 production potential.…”

Section: Wsr Treatment Effectsmentioning

confidence: 88%

Correlations between substrate availability, dissolved CH₄, and CH₄ emissions in an arctic wetland subject to warming and plant removal

et al. 2017

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The Arctic is warming which may potentially affect substrate availability, organic matter decomposition, plant growth, and plant species composition. This may lead to changes in the exchange of methane (CH4) and carbon dioxide (CO2) between the soil system and the atmosphere. Yet the correlations among substrate availability, CH4 production, and net emissions of CH4 have been scarcely studied in arctic wetlands. Presently, the impact of increasing temperatures on CH4 exchange is uncertain as the two existing reports on field warming in arctic wetlands present opposite results. We here report results on how summer warming and shrub removal affect soil water substrate (acetate, formate, oxalate, and dissolved organic carbon) concentrations as well as dissolved CH4 and CH4 emissions in a fen at Disko Island (West Greenland). The peak in dissolved CH4 followed the peak in acetate concentration, and appeared after the peak in CH4 emissions, which indicates a lack of correlation between CH4 production and emissions. The peak in CH4 emissions coincided with maximum gross ecosystem production suggesting that CH4 emissions are closely linked to photosynthesis. This was supported by an experiment with removal of the sedge Carex aquatilis ssp. stans which contributed with up to 77% of the CH4 emitted from the ecosystem. By contrast, shrub removal and summer warming did not significantly affect CH4 emissions, possibly due to the treatments impacting CH4 production more than emissions. This implies that such wetlands may be less sensitive to moderate warming and changes in shrub cover than previously assumed.

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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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Responses of methanogenic and methanotrophic communities to warming in varying moisture regimes of two boreal fens

Cited by 91 publications

References 69 publications

Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Correlations between substrate availability, dissolved CH₄, and CH₄ emissions in an arctic wetland subject to warming and plant removal

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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Responses of methanogenic and methanotrophic communities to warming in varying moisture regimes of two boreal fens

Cited by 91 publications

References 69 publications

Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Responses of phenology and biomass production of boreal fens to climate warming under different water‐table level regimes

Correlations between substrate availability, dissolved CH4, and CH4 emissions in an arctic wetland subject to warming and plant removal

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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Product

Resources

About

Correlations between substrate availability, dissolved CH₄, and CH₄ emissions in an arctic wetland subject to warming and plant removal