Review and assessment of methane emissions from wetlands

Bartlett, Karen B.; Harriss, Robert C.

doi:10.1016/0045-6535(93)90427-7

Cited by 667 publications

(430 citation statements)

References 78 publications

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“…While this estimate is derived from only three wetlands, these sites represent three distinct biogeographical provinces that were sampled multiple times across different seasons. Limiting the comparison to temperate wetlands 60 (0.6-1.1 Â 10 12 m 2 ), AOM may consume between 20 and 40 Tg methane per year, or 1-30 times the estimated annual methane flux from these environments 60,61 . In a direct comparison, atmospheric methane flux measurements 21 were roughly twice the magnitude of areally-integrated AOM rates in Georgia in August 2008.…”

Section: Discussionmentioning

confidence: 99%

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

et al. 2015

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The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of atmospheric methane, is poorly constrained. Here we report rates of microbially mediated AOM (average rate ¼ 20 nmol cm À 3 per day) in three freshwater wetlands that span multiple biogeographical provinces. The observed AOM rates rival those in marine environments. Most AOM activity may have been coupled to sulphate reduction, but other electron acceptors remain feasible. Lipid biomarkers typically associated with anaerobic methane-oxidizing archaea were more enriched in 13 C than those characteristic of marine systems, potentially due to distinct microbial metabolic pathways or dilution with heterotrophic isotope signals. On the basis of this extensive data set, AOM in freshwater wetlands may consume 200 Tg methane per year, reducing their potential methane emissions by over 50%. These findings challenge precepts surrounding wetland carbon cycling and demonstrate the environmental relevance of an anaerobic methane sink in ecosystems traditionally considered strong methane sources.

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Section: Discussionmentioning

confidence: 99%

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

et al. 2015

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“…rushes and sedges) increases emissions (Shannon et al, 1996;Yu et al, 1997;Greenup et al, 2000), a similar result to that observed here was found in an earlier study with mesocosms collected from Auchencorth Moss (Dinsmore et al, in press). As well as providing a source of readily available organic substrate, plants containing aerenchymous tissue can provide a direct pathway for many greenhouse gases to the atmosphere, bypassing the aerobic surface horizon and therefore reducing the potential for oxidation (Bartlett and Harriss, 1993;Minkkinen and Laine, 2006). However, studies have also shown that aerenchyma can transport O 2 into the rhizosphere and can significantly alter the redox state of the surrounding peat (Visser et al, 2000;Wiebner et al, 2002).…”

Section: Controls On Spatial Variationmentioning

confidence: 99%

“…MacDonald et al, 1998;Whalen and Reeburgh, 2000;Laine et al, 2007;Roulet et al, 2007). However, with many studies repeatedly reporting high variability in fluxes both within and between sites (Bartlett and Harriss, 1993;Bubier et al, 1993;Waddington and Roulet, 1996), the uncertainty associated with up-scaling chamber measurements to annual catchment budget estimates is often extremely large. Furthermore, such high uncertainty leads to difficulties in identifying the primary drivers of temporal variability and hence predicting future emissions under different climate change scenarios or management regimes.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the prevalence of waterlogged conditions, they represent a significant net source of CH 4 (Bartlett and Harriss, 1993;Huttunen et al, 2003) and in some cases a net source of N 2 O (Regina et al, 1996;Huttunen et al, 2002). In order to calculate a realistic global warming potential for peatland systems, all three of the aforementioned gases need to be accurately quantified and upscaled.…”

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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“…Flooded rice soil has been recognized as a relatively important source of atmospheric Ž methane Khalil and Rasmussen, 1983;Bartlett . and Harriss, 1993;Wang, 1999 because it provides the suitable conditions for methanogenesis and large areas of land are given over to rice production due to increasing food demands Ž .…”

Section: Introductionmentioning

confidence: 99%

Methane emission from a simulated rice field ecosystem as influenced by hydroquinone and dicyandiamide

Wang

Zheng

et al. 2000

Science of The Total Environment

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A simple apparatus for collecting methane emission from a simulated rice field ecosystem was formed. With no Ž . wheat straw powder amended all treatments with inhibitor s had so much lower methane emission during rice Ž . growth than the treatment with urea alone control , which was contrary to methane emission from the cut rice᎐soil Ž . Ž . system. Especially for treatments with dicyandiamide DCD and with DCD plus hydroquinone HQ , the total amount of methane emission from the soil system and intact rice᎐soil system was 68.25᎐46.64% and 46.89᎐41.78% of the control, respectively. Hence, DCD, especially in combination with HQ, not only increased methane oxidation in the floodwater᎐soil interface following application of urea, but also significantly enhanced methane oxidation in rice root rhizosphere, particularly from its tillering to booting stage. Wheat straw powder incorporated into flooded surface layer soil significantly weakened the above-mentioned simulating effects. Regression analysis indicated that methane emission from the rice field ecosystem was related to the turnover of ammonium-N in flooded surface layer soil. Diminishing methane emissions from the rice field ecosystem was significantly beneficial to the growth of rice. ᮊ 2000 Elsevier Science B.V. All rights reserved.

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Review and assessment of methane emissions from wetlands

Cited by 667 publications

References 78 publications

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

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

Methane emission from a simulated rice field ecosystem as influenced by hydroquinone and dicyandiamide

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