Contrasting rates and diurnal patterns of methane emission from emergent aquatic macrophytes

Chanton, Jeffrey P.; Whiting, Gary J.; Happell, James D.; Gerard, Ghislan

doi:10.1016/0304-3770(93)90040-4

Cited by 180 publications

(116 citation statements)

References 45 publications

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“…One minor peak was just 1 h after sunrise and the major peak was 3 h before sunset. The observed pattern is consistent with those from some vegetated wetlands (Chanton et al 1993;Whiting and Chanton 1996;Chanton et al 1997;Van Der Nat et al 1998), but different from some others, either vegetated or non-vegetated (Chanton et al 1993;Van Der Nat et al 1998;Kaki et al 2001;Ding et al 2004;Wang and Han 2005), which reported the unique peak of methane emission in daytime. Key influencing factors on diurnal pattern of methane emission Correlation analysis showed that there did not exist any significant relationship between CH 4 emissions and water temperature (R = 0.556; p > 0.05) or 5 and 10 cm soil temperatures (R = 0.213, 0.197; p > 0.05), indicating that temperature did not, or, at best, only weakly affected the diurnal emission variation.…”

Section: Temperature( C)supporting

confidence: 82%

“…Based on the ratio, we suggest that the plants here employed the diffusive transport in the dark and additional convective transport under light condition. The sunrise emission peak observed here is similar to the sunrise peaks observed for other emergent plants exploiting diffusive transport during periods of darkness and additional (pressurized) convective transport during periods of sunshine (Chanton et al 1993;Whiting and Chanton 1996;Van Der Nat et al 1998). The emission peaks following sunrise are likely caused by initial ventilation of the enhanced lacunal methane concentrations that have accumulated during darker periods when diffusion dominated gas transport.…”

Section: Temperature( C)supporting

confidence: 78%

“…In other regions of China, consistently, no significant relationship between temperatures and CH 4 emission was found in a diurnal cycle (Ding et al 2004;Duan et al 2005;Wang and Han 2005). Chanton et al (1993) and Kaki et al (2001) observed that CH 4 emission was associated with irradiance, thus factors related to irradiance rather than temperature may control CH 4 emissions. However, due to limited data in our research, more measurements and a longer time of study are needed to clarify if and how the temperature influences the CH 4 diurnal variations from alpine wetlands.…”

Section: Temperature( C)mentioning

confidence: 96%

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Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Chen

Yao

et al. 2009

Environ Monit Assess

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Alpine wetland is a source for CH 4 , but little is known about methane emission from such wetland, especially about its diurnal pattern. In this study we tried to probe the diurnal variation in methane emission from alpine wetland vegetation. The average methane emission rate was 9.6 ± 3.4 mg CH 4 m −2 h −1 . There was an apparent diurnal variation pattern in methane emission with one minor peak at 06:00 and a major one at 15:00. The sunrise peak was consistent with a two-way transport mechanism for plants (convective at daytime and diffusive at night-time). CH 4 emission was found significantly correlated with redox potentials. The afternoon peak could not be explained by diurnal variation in soil temperature, but could be attributable to changes in CH 4 oxidation and production driven by plant gas transport mechanism. The results have important implications for sampling and scaling strategies for estimating methane emission from alpine wetlands.

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Section: Temperature( C)supporting

confidence: 82%

Section: Temperature( C)supporting

confidence: 78%

Section: Temperature( C)mentioning

confidence: 96%

See 1 more Smart Citation

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Chen

Yao

et al. 2009

Environ Monit Assess

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“…There is evidence that pressure-driven flow can also occur, but we did not include that mechanism in the current model. Pressure-driven flow may have a relatively small effect on O 2 and CH 4 fluxes (Wania et al, 2010), although some studies contend the opposite (e.g., Chanton et al, 1993;Chanton and Whiting, 1996;Whiting and Chanton, 1996;Ding and Cai, 2007). The diffusive transport through aerenchyma (A, mol m −2 s −1 ) from each soil layer is represented in the model as:…”

Section: Aerenchyma Transportmentioning

confidence: 99%

“…Many field studies have concluded that the presence of vascular plants with aerenchyma leads to increased net CH 4 emissions (Morrissey et al, 1993;Schimel, 1995;Chanton et al, 1993;Bartlett et al, 1992;Frenzel and Karofeld, 2000;Grunfeld and Brix, 1999;Torn and Chapin, 1993) by providing an efficient escape mechanism for CH 4 . However, in large-scale CH 4 biogeochemical models, separate representations of aerenchyma area (and the attendant diffusive pathway) and methanogenesis substrate inputs are required.…”

Section: Aerenchyma Impacts On Net Ch 4 Emissionsmentioning

confidence: 99%

Barriers to predicting changes in global terrestrial methane fluxes: analyses using CLM4Me, a methane biogeochemistry model integrated in CESM

et al. 2011

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Abstract. Terrestrial net CH 4 surface fluxes often represent the difference between much larger gross production and consumption fluxes and depend on multiple physical, biological, and chemical mechanisms that are poorly understood and represented in regional-and global-scale biogeochemical models. To characterize uncertainties, study feedbacks between CH 4 fluxes and climate, and to guide future model development and experimentation, we developed and tested a new CH 4 biogeochemistry model (CLM4Me) integrated in the land component (Community Land Model; CLM4) of the Community Earth System Model (CESM1). CLM4Me includes representations of CH 4 production, oxidation, aerenchyma transport, ebullition, aqueous and gaseous diffusion, and fractional inundation. As with most global models, CLM4 lacks important features for predicting current and future CH 4 fluxes, including: vertical representation of soil organic matter, accurate subgrid scale hydrology, realistic representation of inundated system vegetation, anaerobic decomposition, thermokarst dynamics, and aqueous chemistry. We compared the seasonality and magnitude of predicted CH 4 emissions to observations from 18 sites and three global atmospheric inversions. Simulated net CH 4 emissions using our baseline parameter set were 270, 160, 50, and 70 Tg CH 4 yr −1 globally, in the tropics, in the temperate zone, and north of 45 • N, respectively; these values are within the range of previous estimates. We then used the model to characterize the sensitivity of regional and global CH 4 emission estimates to uncertainties in model paCorrespondence to: W. J. Riley (wjriley@lbl.gov) rameterizations. Of the parameters we tested, the temperature sensitivity of CH 4 production, oxidation parameters, and aerenchyma properties had the largest impacts on net CH 4 emissions, up to a factor of 4 and 10 at the regional and gridcell scales, respectively. In spite of these uncertainties, we were able to demonstrate that emissions from dissolved CH 4 in the transpiration stream are small (<1 Tg CH 4 yr −1 ) and that uncertainty in CH 4 emissions from anoxic microsite production is significant. In a 21st century scenario, we found that predicted declines in high-latitude inundation may limit increases in high-latitude CH 4 emissions. Due to the high level of remaining uncertainty, we outline observations and experiments that would facilitate improvement of regional and global CH 4 biogeochemical models.

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Investigating carbon flux variability in subtropical peat soils of the Everglades using hydrogeophysical methods

Comas

Wright

2014

J. Geophys. Res. Biogeosci.

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The spatial and temporal variability in accumulation and release of greenhouse gases (mainly methane and carbon dioxide) to the atmosphere from peat soils remains very uncertain. The use of near-surface geophysical methods such as ground penetrating radar (GPR) has proven useful during the last decade to expand scales of measurement as related to in situ gas distribution and dynamics beyond traditional methods (i.e., gas chambers). However, this approach has focused exclusively on boreal peatlands, while no studies in subtropical systems like the Everglades using these techniques exist. In this paper GPR is combined with gas traps, time-lapse cameras, gas chromatography, and surface deformation measurements to explore biogenic gas dynamics (mainly gas buildup and release) in two locations in the Everglades. Similar to previous studies in northern peatlands, our data in the Everglades show a statistically significant correlation between the following: (1) GPR-estimated gas content and gas fluxes, (2) GPR-estimated gas content and surface deformation, and (3) atmospheric pressure and both GPR-estimated gas content and gas flux. From these results several gas-releasing events ranging between 33.8 and 718.8 mg CH 4 m À2 d À1 were detected as identified by the following: (1) decreases in GPR-estimated gas content within the peat matrix, (2) increases in gas fluxes captured by gas traps and time-lapse cameras, and (3) decreases in surface deformation. Furthermore, gas-releasing events corresponded to periods of high atmospheric pressure. Changes in gas accumulation and release were attributed to differences in seasonality and peat soil type between sites. These results suggest that biogenic gas releases in the Everglades are spatially and temporarily variable. For example, flux events measured at hourly scales were up to threefold larger when compared to daily fluxes, therefore suggesting that flux measurements decline when averaged over longer time spans. This research therefore questions what the appropriate spatial and temporal scale of measurement is necessary to properly capture the dynamics of biogenic gas release in subtropical peat soils.

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Contrasting rates and diurnal patterns of methane emission from emergent aquatic macrophytes

Cited by 180 publications

References 45 publications

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Diurnal variation of methane emissions from an alpine wetland on the eastern edge of Qinghai-Tibetan Plateau

Barriers to predicting changes in global terrestrial methane fluxes: analyses using CLM4Me, a methane biogeochemistry model integrated in CESM

Investigating carbon flux variability in subtropical peat soils of the Everglades using hydrogeophysical methods

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