Temporal and spatial variation in methane emissions from a flooded transgression shore of a boreal lake

Kankaala, Paula; Ojala, Anne; Käki, Tiina

doi:10.1023/b:biog.0000031030.77498.1f

Cited by 77 publications

(74 citation statements)

References 33 publications

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“…Given this negative correlation, the high density of 68 shoots m −2 at our site would suggest that total CH 4 flux would be lower compared to wetlands with lower densities. Our observed yearly CH 4 flux of 30 g m −2 a −1 is in the same range as Kankaala et al (2004), who found similar dense reed vegetation (20-50 g m −2 a −1 ) and indeed almost 3 times lower than the flux measured by Kim et al (1998b) in a reed density of only 35 shoots m −2 . So even though our site has a relative low net CH 4 flux, it is likely that plant-mediated gas transport during the growing season could lead to higher CH 4 emissions compared to winter, if in both seasons the ebullition is reduced due to the plant density.…”

Section: Ch 4 Fluxes and Plant-mediated Gas Transportsupporting

confidence: 85%

“…A high water table and vascular plants showed higher methane emission than the same soil and water table without vascular plants. Kankaala et al (2004) found a higher contribution of ebullition to the CH 4 flux in a less dense Phragmites shore zone (24 shoots m −2 ) than in a dense area (78 shoots m −2 ). The less dense Phragmites zone showed 3-fold higher CH 4 emissions than the denser area.…”

Section: Ch 4 Fluxes and Plant-mediated Gas Transportmentioning

confidence: 79%

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The role of Phragmites in the CH4 and CO2 fluxes in a minerotrophic peatland in southwest Germany

et al. 2016

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Abstract. Peatlands are interesting as a carbon storage option, but are also natural emitters of the greenhouse gas methane (CH 4 ). Phragmites peatlands are particularly interesting due to the global abundance of this wetland plant (Phragmites australis) and the highly efficient internal gas transport mechanism, which is called humidity-induced convection (HIC). The research aims were to (1) clarify how this plant-mediated gas transport influences the CH 4 fluxes, (2) which other environmental variables influence the CO 2 and CH 4 fluxes, and (3) whether Phragmites peatlands are a net source or sink of greenhouse gases. CO 2 and CH 4 fluxes were measured with the eddy covariance technique within a Phragmites-dominated fen in southwest Germany. One year of flux data (March 2013-February 2014 shows very clear diurnal and seasonal patterns for both CO 2 and CH 4 . The diurnal pattern of CH 4 fluxes was only visible when living, green reed was present. In August the diurnal cycle of CH 4 was the most distinct, with 11 times higher midday fluxes (15.7 mg CH 4 m −2 h −1 ) than night fluxes (1.41 mg CH 4 m −2 h −1 ). This diurnal cycle has the highest correlation with global radiation, which suggests a high influence of the plants on the CH 4 flux. But if the cause were the HIC, it would be expected that relative humidity would correlate stronger with CH 4 flux. Therefore, we conclude that in addition to HIC, at least one additional mechanism must be involved in the creation of the convective flow within the Phragmites plants. Overall, the fen was a sink for carbon and greenhouse gases in the measured year, with a total carbon uptake of 221 g C m −2 yr −1 (26 % of the total assimilated carbon). The net uptake of greenhouse gases was 52 g CO 2 eq. m −2 yr −1 , which is obtained from an uptake of CO 2 of 894 g CO 2 eq. m −2 yr −1 and a release of CH 4 of 842 g CO 2 eq. m −2 yr −1 .

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Section: Ch 4 Fluxes and Plant-mediated Gas Transportsupporting

confidence: 85%

Section: Ch 4 Fluxes and Plant-mediated Gas Transportmentioning

confidence: 79%

The role of Phragmites in the CH4 and CO2 fluxes in a minerotrophic peatland in southwest Germany

et al. 2016

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“…Typically, maximal CH 4 effluxes in July and August were observed in boreal peatlands, littoral zones of boreal lakes, and alpine wetlands (Alm et al, 1999;Kankaala et al, 2004;Chen et al, 2008). In this study, our samplings were carried in the peak growing season.…”

Section: Discussionmentioning

confidence: 99%

“…Among them wetlands are considered the most important source. However, recent studies on CH 4 effluxes from littoral wetlands, mainly of boreal lakes (Juutinen et al, 2001;Kankaala et al, 2004;Duan et al, 2005;Wang et al, 2006;Bergstrom et al, 2007) suggest that the importance of the littoral zones of the lakes as one of the major natural sources of atmospheric CH 4 may have been underestimated. Therefore, we need more researches on the littoral zones of lakes to get more accurate estimate of CH 4 effluxes.…”

Section: Introductionmentioning

confidence: 99%

“…In dense vegetation stands, 90% of the CH 4 released from the sediment is transported through aerenchymal tissues of plants. However, in sparse stands and non-vegetated areas, bubbling and diffusion are more important mechanisms of CH 4 transport (Chanton and Dacey, 1991;Van Der Nat and Middelburg, 1998;Kankaala et al, 2004). Due to the above-mentioned complicated biogeochemical processes in the littoral zone, CH 4 fluxes from the lake littoral zones may differ considerably with even a short (1-50 m) distance (Juutinen et al, 2001;Kaki et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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High methane emissions from a littoral zone on the Qinghai-Tibetan Plateau

Chen

Yao

et al. 2009

Atmospheric Environment

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Effects of increasing temperatures on methane concentrations and methanogenesis during experimental incubation of sediments from oligotrophic and mesotrophic lakes

et al. 2016

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Global warming is expected to raise temperatures in freshwater lakes, which have been acknowledged to contribute up to 10% of the atmospheric methane concentrations. Increasing temperature enhances methane production and oxidation rates, but few studies have considered the balance between both processes at experimentally higher temperatures within lake sediments. The temperature dependence of methane concentrations, methane production rates, and methanogenic (mcrA) and methanotrophic (pmoA) community size was investigated in intact sediment cores incubated with aerobic hypolimnion water at 4, 8, and 12°C over 3 weeks. Sediment cores of 25 cm length were collected at two temperate lakes—Lake Stechlin (Germany; mesotrophic‐oligotrophic, maximum depth 69.5 m) and Lake Geneva (France/Switzerland; mesotrophic, maximum depth 310 m). While methane production rates in Lake Stechlin sediments did not change with increasing temperatures, methane concentrations decreased significantly. In contrast, methane production rates increased in 20–25 cm in Lake Geneva sediments with increasing temperatures, but methane concentrations did not differ. Real‐time PCR demonstrated the methanogenic and methanotrophic community size remained stable independently of the incubation temperature. Methane concentrations as well as community sizes were 1–2 orders of magnitude higher in Lake Stechlin than in Lake Geneva, while potential methane production rates after 24 h were similar in both lakes, with on average 2.5 and 1.9 nmol g−1 DW h−1, respectively. Our results suggest that at higher temperatures methane oxidation could balance, and even exceed, methane production. This suggests that anaerobic methane oxidation could be involved in the methane balance at a more important rate than previously anticipated.

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Temporal and spatial variation in methane emissions from a flooded transgression shore of a boreal lake

Cited by 77 publications

References 33 publications

The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany

The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany

High methane emissions from a littoral zone on the Qinghai-Tibetan Plateau

Effects of increasing temperatures on methane concentrations and methanogenesis during experimental incubation of sediments from oligotrophic and mesotrophic lakes

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Temporal and spatial variation in methane emissions from a flooded transgression shore of a boreal lake

Cited by 77 publications

References 33 publications

The role of &lt;i&gt;Phragmites&lt;/i&gt; in the CH&lt;sub&gt;4&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; fluxes in a minerotrophic peatland in southwest Germany

The role of &lt;i&gt;Phragmites&lt;/i&gt; in the CH&lt;sub&gt;4&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; fluxes in a minerotrophic peatland in southwest Germany

High methane emissions from a littoral zone on the Qinghai-Tibetan Plateau

Effects of increasing temperatures on methane concentrations and methanogenesis during experimental incubation of sediments from oligotrophic and mesotrophic lakes

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The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany

The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany