Seasonal methane dynamics in three temperate grasslands on peat

Schäfer, C.; Elsgaard, Lars; Hoffmann, Carl Christian; Petersen, Søren O.

doi:10.1007/s11104-012-1168-9

Cited by 38 publications

(35 citation statements)

References 52 publications

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“…3). Schäfer et al (2012) likewise found significant CH 4 production potentials both above and below the water table at the Mørke site of the present study, and at a drained bog site used for grazing. The presence of methanogens in these soil layers was later confirmed by molecular characterization of prevailing archaea (Görres et al, 2013).…”

Section: Discussionsupporting

confidence: 80%

“…This maximum was closer to the soil surface than the maxima observed at the two other sites, and well within reach of the roots of J. effusus. In the study of Schäfer et al (2012), the CH 4 accumulation was lower in soils with J. effusus tussocks than in plots without J. effusus, which is consistent with plant-mediated transport of CH 4 (Chanton et al, 1989;Sorrell and Boon, 1994). We hypothesize two different scenarios causing the positive effect of J. effusus on CH 4 emissions at Mørke.…”

Section: Discussionsupporting

confidence: 68%

“…Capillary forces have been shown to largely saturate peat well above the water table (Grünfeld and Brix, 1999). According to Schäfer et al (2012), the peat at Mørke was degraded to H8-H10 on the Von Post scale. In comparison, the peat at Fussingø and Torsager sites were categorized as H8 and H6, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…While the potential of vegetation indexes as indicators of CH 4 emissions has been pursued in wetland ecosystems, this has not to the same extent been considered for drained organic soils where CH 4 emissions are generally low, negligible or even reversed to uptake of atmospheric CH 4 (Flessa et al, 1998;Schäfer et al, 2012). A recent study of greenhouse gas balances for eight organic soils (0.7 to 2.2 m peat depth) managed for agriculture confirmed the low or slightly negative flux of CH 4 from drained organic soils, with reported fluxes between -0.1 and 0.2 mg CH 4 m −2 h −1 .…”

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confidence: 99%

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Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?

et al. 2015

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Abstract. Methane (CH 4 ) emissions from drained organic soils are generally low, but internal gas transport in aerenchymatous plants may result in local emission hotspots. In a paired-sample field study at three different sites we measured fluxes of CH 4 with static chambers from adjacent sampling quadrats with and without Juncus effusus during four field campaigns. At all three sites, CH 4 was observed in the soil at all sampling depths (5 to 100 cm), and in most cases both above and below the groundwater table. During spring, local maxima suggested methanogenesis also took place above the water table at all three sites. We found significant CH 4 emissions at all three sites, but emission controls were clearly different. Across the three sites, average emission rates (±1 SE) for sampling quadrats with and without J. effusus were 1.47 ± 0.28 and 1.37 ± 0.33 mg CH 4 m −2 h −1 , respectively, with no overall effect of J. effusus on CH 4 emissions. However, a significant effect of J. effusus was seen at one of the three sites. At this site, local CH 4 maxima were closer to the soil surface than at the other sites, and the upper soil layers were dryer. This could have affected both root CH 4 accessibility and CH 4 oxidation respectively, and together with limited gas diffusivity in the soil column, cause elevated CH 4 emissions from J. effusus. We conclude that J. effusus has the potential to act as point sources of CH 4 from drained peatlands, but more studies on the specific conditions under which there is an effect, are needed before the results can be used in modelling of CH 4 emissions.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?

et al. 2015

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“…Spatio‐temporal changes in O 2 concentration and dynamics are not well understood, and there is a need for a continuous high‐resolution monitoring of O 2 dynamics in situ. Numerous studies have investigated water table effects on CH 4 emissions (e.g., Macdonald et al, 1998; Daulat and Clymo, 1998; Hargreaves and Fowler, 1998; Kettunen, 2003; Schäfer et al, 2012). Also, the complex interactions of subsurface O 2 concentrations with CH 4 production and consumption have been demonstrated in a laboratory study (Askaer et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

et al. 2013

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Long-term measurements of molecular oxygen (O) dynamics in wetlands are highly relevant for understanding the effects of water level changes on net greenhouse gas budgets in these ecosystems. However, such measurements have been limited due to a lack of suitable measuring equipment. We constructed an O optode sensor array for long-term in situ measurements in soil and sediment. The new device consists of a 1.3-m-long, cylindrical, spear-shaped rod equipped with 10 sensor spots along the shaft. Each spot contains a thermocouple fixed with a robust fiberoptic O optode made by immobilizing a layer of Pt(II) meso-tetra(pentafluorophenyl)porphine in polystyrene at the end of a 2-mm polymethyl methacrylate plastic fiber. Temperature and O optode readings are collected continuously by a data logger and a multichannel fiberoptic O meter. The construction and measuring characteristics of the sensor array system are presented along with a novel approach for temperature compensation of O optodes. During in situ application over several months in a peat bog, we used the new device to document pronounced variations in O distribution after marked shifts in water level. The measurements showed anoxic conditions below the water level but also diel variations in O concentrations in the upper layer presumably due to rhizospheric oxidation by the main vegetation The new field instrument thus enables new and more detailed insights to the in situ O dynamics in wetlands.

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Greenhouse Gas Fluxes of Agricultural Soils in Finland

Regina

Heikkinen

Maljanen

2018

Energy, Environment, and Sustainability

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Seasonal methane dynamics in three temperate grasslands on peat

Cited by 38 publications

References 52 publications

Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?

Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

Greenhouse Gas Fluxes of Agricultural Soils in Finland

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Seasonal methane dynamics in three temperate grasslands on peat

Cited by 38 publications

References 52 publications

Does &lt;i&gt;Juncus effusus&lt;/i&gt; enhance methane emissions from grazed pastures on peat?

Does &lt;i&gt;Juncus effusus&lt;/i&gt; enhance methane emissions from grazed pastures on peat?

An Optode Sensor Array for Long-Term In Situ Oxygen Measurements in Soil and Sediment

Greenhouse Gas Fluxes of Agricultural Soils in Finland

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Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?

Does <i>Juncus effusus</i> enhance methane emissions from grazed pastures on peat?