Temperate mire fluctuations from carbon sink to carbon source following changes in water table

Fortuniak, Krzysztof; Pawlak, Włodzimierz; Siedlecki, Mariusz; Chambers, Scott; Bednorz, Leszek

doi:10.1016/j.scitotenv.2020.144071

Cited by 19 publications

(10 citation statements)

References 95 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, multi-year measurements in wetlands of northern Finland showed CO 2 uptake at 44-792 g m − 2 yr − 1 with low values during years of drought and high temperatures (Aurela et al 2009). A similar trend was found during a 6-year observation of CO 2 uxes in wetlands in northeastern Poland when in wet years the wetland area absorbed about 270 ± 70 g m − 2 yr − 1 while in drought years CO 2 was found to be 130 ± 70 g m − 2 yr − 1 (Fortuniak et al 2021).…”

supporting

confidence: 86%

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

Siedlecki,

Fortuniak,

Pawlak

2024

Preprint

View full text Add to dashboard Cite

The primary goal of the study is to characterize the evapotranspiration of wetlands against the background of changing meteorological conditions. The relatively long measurement period makes it possible to show the dynamics of this process both under conditions of high precipitation and periods of drought. Moreover, the analyzed period also includes measurements of evapotranspiration under conditions of rapid recovery of wetland vegetation after fire. The accomplishment of the research objectives was based on measurements using the eddy covariance method in the Biebrza National Park in northeastern Poland. The measurement period covers the years 2013–2021. Latent heat flux Qe is characterized by a distinct annual cycle with the highest values in the summer season. Average daily values of Qe from July to August were in the range of 6–10 MJ m− 2 d− 1, which is on average 60–70% of the value of the radiation balance. The relatively long measurement period showed that the evapotranspiration of the wetland surface is characterized by very high stability. The achieved values of daily as well as monthly totals during periods of drought were very close to those recorded in seasons with high precipitation. The high rate of evapotranspiration led to a decrease in groundwater levels and a significant deterioration in the water resources of the wetland environment.

show abstract

supporting

confidence: 86%

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

Siedlecki,

Fortuniak,

Pawlak

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Our study demonstrated that a shallow Boreal Shield peatland displayed tremendous interannual variability in summer ecosystem scale CO 2 fluxes in response to interannual variability in summer water deficit as manifested through the peatland WT position. While several studies conducted in deep peatlands have also observed this strong CO 2 sink in wet summers and a weak CO 2 sink in dry summers function (e.g., Aurela et al., 2007; Bubier et al., 2003; Fortuniak et al., 2021; Moore & Knowles, 1989; Strachan et al., 2016), we argue that shallow peatlands are more sensitive to the same summer water deficit than deep peatlands and, as such, their long‐term carbon sink function is likely more vulnerable to future climate change‐mediated summer drought.…”

Section: Discussionmentioning

confidence: 92%

“…While several studies have observed a decline in net carbon dioxide (CO 2 ) uptake in summers with a low WT (Aurela et al., 2007; Bubier et al., 2003; Fortuniak et al., 2021; Moore & Knowles, 1989; Strachan et al., 2016) due to lower gross primary productivity (GPP) (Lund et al., 2012; Strachan et al., 2016) and increased ecosystem respiration (ER) (Aurela et al., 2007; Lund et al., 2012), peatlands are generally considered resilient to moderately dry periods (Waddington et al., 2015). Peatland ecohydrological resilience to drought is maintained through a suite of negative autogenic ecohydrological feedbacks that act to generally maintain a shallow WT and wet conditions in the near‐surface peat (Nijp et al., 2017; Waddington et al., 2015) thereby limiting the response of ER and GPP to summer water deficits (e.g., Blodau et al., 2004).…”

Section: Introductionmentioning

confidence: 99%

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland

et al. 2023

View full text Add to dashboard Cite

Northern peatlands are globally important ecosystems for long-term carbon storage (Blodau et al., 2004;Clymo, 1987), and have exerted a global climate cooling effect over millennia (Frolking et al., 2006). While only covering ∼3% of the global land area, peatlands store approximately one third of the global organic soil carbon pool (Gorham, 1991;Xu et al., 2018;Yu et al., 2010). This long-term accumulation of peat is generally facilitated by a water table (WT) level near the peatland surface, which limits peat decomposition rates (Benscoter et al., 2005;Clymo, 1984) and maintains high photosynthetic capacity for the key peat-forming Sphagnum mosses (

show abstract

“…The measured and modelled fluxes of CO 2 and CH 4 in 2012 were similar to previously reported rates for peatlands in the Rocky Mountains (Chimner & Cooper, 2003b; Wickland et al, 2001). Modelled NEP was negative for the 2012 growing season at the study site; however, the CO 2 source/sink role for peatlands can vary from year to year as a result of inter‐annual variability in environmental conditions (Fortuniak et al, 2021), including peatlands found in the Rocky Mountains (Millar et al, 2017). Peak SWE and summer precipitation were both below average at the site in 2012 (Millar et al, 2017), indicating that the low NEP for the growing season was due in part to drier conditions resulting in a lower water table.…”

Section: Discussionmentioning

confidence: 95%

Hydrological dynamics and associated greenhouse gas fluxes in a mountain peatland under different climate scenarios

et al. 2023

View full text Add to dashboard Cite

Peatlands have sequestered atmospheric carbon dioxide (CO2) for millennia and can also act as significant sources of atmospheric methane (CH4). Hydrological processes that control water table dynamics, and climatic conditions such as air temperature, play important roles in mediating peatland–atmosphere exchange of these greenhouse gases. These controls are likely to be impacted by climate change, particularly for those peatlands found in cold environments, including mountain regions. In this study, we developed empirical models to simulate hydrological dynamics and ecosystem–atmosphere C exchange in a mountain peatland under three climate scenarios (2012 air temperatures, +2°C and +4°C). Observed water table dynamics and air temperature were used to model ecosystem–atmosphere C exchange during the 2012 growing season. Modelled snowmelt dynamics were used to predict water table position at the beginning of the growing season for warming scenarios, and the subsequent water table dynamics and increased air temperature were used to drive the same C exchange models during the growing seasons. Increased air temperatures led to earlier snowmelt and water table decline, causing water tables to drop by 10 and 19 cm for the +2 and +4°C scenarios, respectively. This led to roughly a two‐fold decrease in growing season net ecosystem production (NEP) in both warming scenarios, as a result of increased ecosystem respiration relative to gross primary production. Methane efflux was positively correlated with NEP and therefore decreased under the warming scenarios, albeit to a lesser degree. These results indicate that reductions in NEP and CH4 efflux are possible in low‐elevation mountain peatlands that are dependent on snowpack‐derived hydrologic inputs. These ecosystems are found at elevations where future winter precipitation will increasingly fall as rain rather than snow and melting of snowpack will occur earlier under warmer conditions.

show abstract

Temperate mire fluctuations from carbon sink to carbon source following changes in water table

Cited by 19 publications

References 95 publications

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland

Hydrological dynamics and associated greenhouse gas fluxes in a mountain peatland under different climate scenarios

Contact Info

Product

Resources

About

Temperate mire fluctuations from carbon sink to carbon source following changes in water table

Cited by 19 publications

References 95 publications

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

A long-term (2012-2021) measurement and modelling evapotranspiration of the Biebrza Valley wetland area (Poland)

Reduced Net CO2 Uptake During Dry Summers in a Boreal Shield Peatland

Hydrological dynamics and associated greenhouse gas fluxes in a mountain peatland under different climate scenarios

Contact Info

Product

Resources

About

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland