Plant-mediated CH4 transport and C gas dynamics quantified in-situ in a Phalaris arundinacea-dominant wetland

Askaer, Louise; Elberling, Bo; Friborg, Thomas; Jørgensen, Christian Juncher; Hansen, Birger Ulf

doi:10.1007/s11104-011-0718-x

Cited by 40 publications

(33 citation statements)

References 37 publications

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“…In contrast, Schimel (1995) found that clipping leaf blades significantly increased CH 4 flux from a Carex aquatilis site, but not from an Eriophorum angustifolium site in a wet meadow of Alaska. However, we did not find significant difference of CH 4 flux rates between shoot clipping and control treatment, which was not consistent with other studies (Ding et al 2005;Askaer et al 2011). CH 4 flux depends on the balance between CH 4 production, oxidation and transport.…”

Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxescontrasting

confidence: 99%

“…Previous studies have suggested that about 3 % to 4 % of net ecosystem production (NEP) is emitted back to the atmosphere as CH 4 (Whiting and Chanton 1993;Bellisario et al 1999). In this study, however, CH 4 emissions during drawdown periods were relatively low and accounted for less than 1 % of the annual carbon assimilation, which was consistent with Askaer et al (2011). This could be partly explained by a strong C sink due to the double growing season of the Carex meadow during drawdown periods (Hu et al 2015).…”

Section: Ch 4 and N 2 O Emissions During Drawdown Periodssupporting

confidence: 70%

“…The effects of clipping on CH 4 emissions have been reported to vary with water table depth and clipping height above the surface, and are largely species dependent (Schimel 1995;Kelker and Chanton 1997;Ding et al 2005;Askaer et al 2011). For example, Askaer et al (2011) found that clipping all above-ground vegetation decreased CH 4 flux by about 70 % as compared to the intact plant system in a Phalaris arundinacea dominated temperate wetland in Denmark.…”

Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxesmentioning

confidence: 99%

“…For example, Askaer et al (2011) found that clipping all above-ground vegetation decreased CH 4 flux by about 70 % as compared to the intact plant system in a Phalaris arundinacea dominated temperate wetland in Denmark. In contrast, Schimel (1995) found that clipping leaf blades significantly increased CH 4 flux from a Carex aquatilis site, but not from an Eriophorum angustifolium site in a wet meadow of Alaska.…”

Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxesmentioning

confidence: 99%

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Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Cai

Yao

et al. 2015

Plant Soil

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Aims Plants have been suggested to have significant effects on methane (CH 4 ) and nitrous oxide (N 2 O) fluxes from littoral wetlands, but it remains unclear in subtropical lakes. Methods We conducted in situ measurement of CH 4 and N 2 O fluxes for two years. To distinguish between the effects of shoots and roots, three treatments (i.e., intact plants as control, shoot clipping, and root exclusion) were used. Effects of plant biomass, temperature, and soil moisture on CH 4 and N 2 O fluxes were analyzed. Results The mean ecosystem CH 4 emission rate was 36 μg CH 4 m −2 h −1 for drying periods, but 8219 μg CH 4 m −2 h −1 for drying-wetting transition periods. CH 4 fluxes were positively correlated with below-ground and total biomass, but not with above-ground biomass. Clipping did not significantly alter CH 4 flux rate, but root exclusion decreased the CH 4 flux by 116 % as compared to the control. N 2 O emissions were similar for both the drying and drying-wetting transition periods, with a mean rate of 20 μg N 2 O m −2 h −1 . Both clipping and root exclusion significantly increased N 2 O fluxes as compared to the control. Conclusions There was no significant correlation between CH 4 and N 2 O fluxes. Roots dominated plantmediated enhancement in CH 4 fluxes, but played almost an equal role as shoots in plant-regulated suppression on N 2 O fluxes in this Carex meadow during drawdown periods.

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Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxescontrasting

confidence: 99%

Section: Ch 4 and N 2 O Emissions During Drawdown Periodssupporting

confidence: 70%

Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxesmentioning

confidence: 99%

Section: Impact Of Shoot Clipping and Root Exclusion On Ch 4 Fluxesmentioning

confidence: 99%

See 2 more Smart Citations

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Cai

Yao

et al. 2015

Plant Soil

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“…It can be established from seeds as normal agricultural grass (Kandel et al, 2013b), but in some countries it is considered as an invasive species (Maurer et al, 2003). The plants thrive in wet soils due to aerenchyma tissues (Kercher and Zedler, 2004;Askaer et al, 2011) that transport oxygen to the roots in otherwise anaerobic soil compartments. However, cultivating wetland plants like RCG may influence the overall GHG balance by a combination of contrasting effects.…”

Section: Introductionmentioning

confidence: 99%

Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

2015

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Abstract. Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWLs), i.e. 0, −10 and −20 cm below the soil surface in a controlled semi-field facility. Emissions of CO 2 (ecosystem respiration, ER), CH 4 and N 2 O from mesocosms with RCG and bare soil were measured at weekly to fortnightly intervals with static chamber techniques for a period of 1 year. Cultivation of RCG increased both ER and CH 4 emissions, but decreased the N 2 O emissions. The presence of RCG gave rise to 69, 75 and 85 % of total ER at −20, −10 and 0 cm GWL, respectively. However, this difference was due to decreased soil respiration at the rising GWL as the plant-derived CO 2 flux was similar at all three GWLs. For methane, 70-95 % of the total emission was due to presence of RCG, with the highest contribution at −20 cm GWL. In contrast, cultivation of RCG decreased N 2 O emission by 33-86 % with the major reductions at −10 and −20 cm GWL. In terms of global warming potential, the increase in CH 4 emissions due to RCG cultivation was more than offset by the decrease in N 2 O emissions at −10 and −20 cm GWL; at 0 cm GWL the CH 4 emissions was offset only by 23 %. CO 2 emissions from ER were obviously the dominant RCG-derived GHG flux, but aboveground biomass yields, and preliminary measurements of gross photosynthetic production, showed that ER could be more than balanced due to the photosynthetic uptake of CO 2 by RCG. Our results support that RCG cultivation could be a good land use option in terms of mitigating GHG emission from rewetted peatlands, potentially turning these ecosystems into a sink of atmospheric CO 2 .

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Evening methane emission pulses from a boreal wetland correspond to convective mixing in hollows

Godwin

Markfort

2013

JGR Biogeosciences

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[1] Spatial and temporal heterogeneity of methane flux from boreal wetlands makes prediction and up-scaling challenging, both within and among wetland systems. Drivers of methane production and emissions are also highly variable, making empirical model development difficult and leading to uncertainty in methane emissions estimates from wetlands. Previous studies have examined this problem using point-scale (static chamber method) and ecosystem-scale (flux tower methods) measurements, but few studies have investigated whether different processes are observed at these scales. We analyzed methane emissions from a boreal fen, measured by both techniques, using data from the Boreal Ecosystem-Atmosphere Study. We sought to identify driving processes associated with methane emissions at two scales and explain diurnal patterns in emissions measured by the tower. The mean methane emission rates from flux chambers were greater than the daytime, daily mean rates measured by the tower, but the nighttime, daily mean emissions from the tower were often an order of magnitude greater than emissions recorded during the daytime. Thus, daytime measurements from either the tower or chambers would lead to a biased estimate of total methane emissions from the wetland. We found that the timing of nighttime emission events was coincident with the cooling and convective mixing within hollows, which occurred regularly during the growing season. We propose that diurnal thermal stratification in shallow pools traps methane by limiting turbulent transport. This methane stored during daytime heating is later released during evening cooling due to convective turbulent mixing.Citation: Godwin, C. M., P. J. McNamara, and C. D. Markfort (2013), Evening methane emission pulses from a boreal wetland correspond to convective mixing in hollows,

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Plant-mediated CH4 transport and C gas dynamics quantified in-situ in a Phalaris arundinacea-dominant wetland

Cited by 40 publications

References 37 publications

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods

Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

Evening methane emission pulses from a boreal wetland correspond to convective mixing in hollows

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