Quantifying the effects of water table and soil temperature on the emission of methane from peat wetland at the field scale

Hargreaves, K. J.; Fowler, D.

doi:10.1016/s1352-2310(98)00082-x

Cited by 91 publications

(78 citation statements)

References 32 publications

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“…In particular, one of the chambers, which was also in the top 3 highest CH 4 emitters on 94% of sampling occasions, had the highest water table on 89% of Among the variables included in the CH 4 flux spatial variation models (Table 3) were pH, DOC, water table depth and soil moisture. The correlation with water table depth has been well documented in previous studies (Moore and Dalva, 1993;Aerts and Ludwig, 1997;Hargreaves and Fowler, 1998;MacDonald et al, 1998;Dinsmore et al, in press). Soil moisture is strongly linked to water table depth and may act as an indication of not only current but also antecedent water levels.…”

Section: Controls On Spatial Variationsupporting

confidence: 68%

“…Although soil temperature alone was not significant, its exclusion from the model increased the overall model P-value above 0.05 and was therefore included. (Regina et al, 1996;MacDonald et al, 1997;Hargreaves and Fowler, 1998;Laine et al, 2007;McNamara et al, 2008). This is most likely due to the relatively shallow peat layer underlying the chambers limiting CH 4 production and low nitrate availability restricting denitrification.…”

Section: Temporal Variability (Site 2)mentioning

confidence: 99%

“…Although both temperature and water table have repeatedly been shown to be strong drivers of temporal variability in surface CH 4 and N 2 O fluxes, studies often disagree as to their relative importance (Daulat and Clymo, 1998;Hargreaves and Fowler, 1998;Updegraff et al, 2001). It is likely, given the degree of within-site variability often observed, that the primary drivers of temporal variability are not consistent across typical peatland sites.…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal variability in CH4 and N2O fluxes from a Scottish ombrotrophic peatland: Implications for modelling and up-scaling

Dinsmore

Skiba

Billett

et al. 2009

Soil Biology and Biochemistry

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Peatlands typically exhibit significant spatial heterogeneity which can lead to large uncertainties when catchment scale greenhouse gas fluxes are extrapolated from chamber measurements (generally <1 m 2 ). Here we examined the underlying environmental and vegetation characteristics which led to within-site variability in both CH 4 and N 2 O emissions and the importance of such variability in up-scaling. We also consider within-site variation in the controls of temporal dynamics. Net annual emissions (and coefficients of variation) for CH 4 and N 2 O were 1.06 kg ha -1 y -1 (300%) and 0.02 kg ha -1 y -1 (410%), respectively. The riparian zone was a significant CH 4 hotspot contributing ~12% of the total catchment emissions whilst covering only ~0.5% of the catchment area. In contrast to many other studies we found smaller CH 4 emissions and greater uptake in chambers containing either sedges or rushes. We also found clear differences in the drivers of temporal CH 4 dynamics across the site, e.g.water table was important only in chambers which did not contain aerenchymous plants. We suggest that depending on the heterogeneity of the site, flux models could be improved by incorporating a number of spatially distinct sub-models, rather than a single model parameterized using whole-catchment averages.

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Section: Controls On Spatial Variationsupporting

confidence: 68%

Section: Temporal Variability (Site 2)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal variability in CH4 and N2O fluxes from a Scottish ombrotrophic peatland: Implications for modelling and up-scaling

Dinsmore

Skiba

Billett

et al. 2009

Soil Biology and Biochemistry

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“…A common approach to the consideration of CH 4 flux is to consider its relation to potential drivers especially depth to the water table (Roulet et al, 1993;Daulet and Clymo, 1998;Hargreaves and Fowler, 1998 …”

Section: Methanementioning

confidence: 99%

The multi-annual carbon budget of a peat-covered catchment

Worrall

Burt

Rowson

et al. 2009

Science of The Total Environment

107

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This study estimates the complete carbon budget of an 11.4 km 2 peat-covered catchment in Northern England. The budget considers both fluvial and gaseous carbon fluxes and includes estimates of particulate organic carbon (POC); dissolved organic carbon (DOC); excess dissolved CO 2 ; release of methane (CH 4 ); net ecosystem respiration of CO 2 ; and uptake of CO 2 by primary productivity. All components except CH 4 were measured directly in the catchment and annual carbon budgets were calculated for the catchment between 1993 and 2005 using both extrapolation and interpolation methods. The study shows that: Over the 13 year study period the total carbon balance varied between a net sink of − 20 to − 91 Mg C/km 2 /yr. The biggest component of this budget is the uptake of carbon by primary productivity (− 178 Mg C/km 2 /yr) and in most years the second largest component is the loss of DOC from the peat profile (+39 Mg C/km 2 /yr). Direct exchanges of C with the atmosphere average − 89 Mg C/km 2 /yr in the catchment. Extrapolating the general findings of the carbon budget across all UK peatlands results in an approximate carbon balance of − 1.2 Tg C/ yr (±0.4 Pg C/yr) which is larger than previously reported values. Carbon budgets should always be reported with a clear statement of the techniques used and errors involved as this is significant when comparing results across studies.

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“…Northern peatlands are significant sources of CH 4 , and are estimated to emit between 20 and 50 Tg yr −1 (Mikaloff Fletcher et al 2004a, b). In northern oligotrophic and eutrophic managed peatland systems, net uptake and emission rates of CH 4 have been found to depend on groundwater level, soil moisture content, temperature, and grassland management (Van den Pol-van Dasselaar et al 1998a;Hargreaves and Fowler 1998;Christensen et al 2003;Blodau and Moore 2003;Hendriks et al 2007;Pelletier et al 2007). CH 4 emissions are difficult to estimate because of their large spatial and temporal variability (e.g.…”

Section: Introductionmentioning

confidence: 99%

Methane emissions in two drained peat agro-ecosystems with high and low agricultural intensity

Schrier-Uijl

Kroon

Leffelaar³

et al. 2009

Plant Soil

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Methane (CH 4 ) emissions were compared for an intensively and extensively managed agricultural area on peat soils in the Netherlands to evaluate the effect of reduced management on the CH 4 balance. Chamber measurements (photoacoustic methods) for CH 4 were performed for a period of three years in the contributing landscape elements in the research sites. Various factors influencing CH 4 emissions were evaluated and temperature of water and soil was found to be the main driver in both sites. For upscaling of CH 4 fluxes to landscape scale, regression models were used which were specific for each of the contributing landforms. Ditches and bordering edges were emission hotspots and emitted together between 60% and 70% of the total terrestrial CH 4 emissions. To further evaluate the effect of agricultural activity on the CH 4 balance, the annual CH 4 fluxes of the two managed sites were also compared to the emissions of a natural peat site with no management and high ground water levels. By comparing the terrestrial and additional farm based emissions of the three sites, we finally concluded that transformation of intensively managed agricultural land to nature development will lead to an increase in terrestrial CH 4 emission, but will not by definition lead to a significant increase in CH 4 emission when farm based emissions are included.

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Quantifying the effects of water table and soil temperature on the emission of methane from peat wetland at the field scale

Cited by 91 publications

References 32 publications

Spatial and temporal variability in CH4 and N2O fluxes from a Scottish ombrotrophic peatland: Implications for modelling and up-scaling

Spatial and temporal variability in CH4 and N2O fluxes from a Scottish ombrotrophic peatland: Implications for modelling and up-scaling

The multi-annual carbon budget of a peat-covered catchment

Methane emissions in two drained peat agro-ecosystems with high and low agricultural intensity

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