Carbon Dioxide and Methane Dynamics in a Peatland Headwater Stream: Origins, Processes and Implications

Taillardat, Pierre; Bodmer, Pascal; Deblois, Charles P.; Ponçot, Alex; Prijac, Antonin; Riahi, Khawla; Gandois, Laure; Giorgio, Paul A. del; Baird, A. J.; Tremblay, Alain; Garneau, Michelle

doi:10.1029/2022jg006855

Cited by 17 publications

(36 citation statements)

References 105 publications

(169 reference statements)

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“…3). This notion of transfer limitation echoes the findings from other low-energy systems such as peatland draining streams (Schneider et al 2020;Taillardat et al 2022) and contrasts with high-energy, mountainous streams (Crawford et al 2015;Horgby et al 2019;Clow et al 2021), where evasion tends to be limited by C availability. More generally, our results indicate that CO 2 evasion changes as a function of the interplay between dissolved CO 2 availability and flow turbulence.…”

Section: Internal Metabolism Exceeds Co 2 Evasionsupporting

confidence: 74%

“…Potential contribution of NEP to CO 2 evasion in different streams and rivers, extracted from Abril et al (2014), Bernal et al (2022), Borges et al (2019), Borges et al (2015), Carter et al (2022), Cole and Caraco (2001), Demars (2019), Duvert et al (2019); Ellis et al (2012), Gómez‐Gener et al (2016), Hotchkiss et al (2015), Lupon et al (2019), Lynch et al (2010), Marzolf et al (2022), Moustapha et al (2022), Rasilo et al (2017), Rocher‐Ros et al (2020), Taillardat et al (2022), Teodoru et al (2015), Wang et al (2021), and Winterdahl et al (2016). 1 Estimates for 2005.…”

Section: Discussionmentioning

confidence: 99%

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Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream

Solano

Duvert

Birkel

et al. 2023

Limnology & Oceanography

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Carbon dioxide (CO2) can be either imported to streams through groundwater and subsurface inputs of soil‐respired CO2 or produced internally through stream metabolism. The contribution of each source to the CO2 evasion flux from streams is not well quantified, especially in the tropics, an underrepresented region in carbon (C) cycling studies. We used high‐frequency measurements of dissolved O2 and CO2 concentrations to estimate the potential contribution of stream metabolism to the CO2 evasion flux in a tropical lowland headwater stream. We found that the stream was heterotrophic all year round, with net ecosystem productivity (NEP) values ranging from 0.84 to 4.06 g C m−2 d−1 (median 1.29 g C m−2 d−1; here we expressed gross primary productivity (GPP) as a negative flux and ecosystem respiration (ER) as a positive flux). Positive NEP values were the result of a relatively low and stable GPP through the seasons, compared to a higher and more variable ER favored by the high temperatures and organic matter availability, particularly during the wet season. The CO2 evasion flux was relatively low due to low turbulence (median: 1.09 g C m−2 d−1). As a result, daily NEP rates exceeded the CO2 evasion flux with a potential contribution of 129% (median; 120–175% interquartile range), despite the strong seasonal changes in flow regime and landscape connectivity. The CO2 excess was likely transported downstream, where it was ultimately emitted to the atmosphere. Our results highlight the overwhelming importance of ER to the C cycle of low‐energy, oligotrophic tropical streams.

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Section: Internal Metabolism Exceeds Co 2 Evasionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream

Solano

Duvert

Birkel

et al. 2023

Limnology & Oceanography

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“…Our calculated areal flux rate of methane emission from the Badas Canal surface (total emission/canal surface area) is also in range of the few canal methane flux observations that exist for SE Asia (Table 2) measured with floating chambers. While no similar studies to ours exist in the tropics, a recent study in a northern peatland estimated that 38%–87% of methane advected into a headwater stream was oxidized in the stream (Taillardat et al., 2022), bracketing our findings (70%). However, they did not find the same spatial patterns in CH 4 and CO 2 , possibly because the natural stream did not have a stagnant upstream area and had more variation in cross section.…”

Section: Resultssupporting

confidence: 72%

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

et al. 2023

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Most peat domes in Southeast Asia are crisscrossed by networks of drainage canals. These canals are a potentially important source of methane to the atmosphere because the groundwater that discharges into them carries high concentrations of dissolved methane that is produced within peat. In this study, we present an isotope‐enabled numerical model that simulates transport, degassing, and oxidation of methane and dissolved inorganic carbon (DIC) along a drainage canal. We then estimate methane fluxes through a 5‐km canal that crosses a disturbed, forested, but undeveloped, peat dome in Brunei Darussalam by applying this model to field data: concentrations and stable carbon isotopic ratios of both methane and dissolved inorganic carbon from both peat porewater and canal water. We estimate that approximately 70% of the methane entering the canal is oxidized within the canal, 26% is degassed to the atmosphere, and 4% is transported toward the ocean, under low to moderate flow conditions. The flux of methane to the atmosphere is lowest at the maximum elevation of the canal, where flow is stagnant and methane concentrations are highest. Downstream, as flow velocity increases, methane emissions plateau even as methane concentrations decrease. The resulting methane emissions from the canal are large compared to emissions from the peat surface and vegetation on a per‐area basis. However, since the canal covers only a small portion of the catchment area, the canal may be a substantial but not dominant source of methane from the peatland.

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“…We see a distinct shift toward higher CH 4 :CO 2 ratios with lower discharge in New Hope Creek (Figure 6). An increase in anaerobic processes with low discharge may be attributed to higher groundwater exchange or porewater seepage (Taillardat et al., 2022), the development of anoxic regions within the channel, or less atmospheric exchange. Geomorphologies that have consistently low water velocities such as pools tend to accumulate fine sediments that settle out of the water column, creating conditions conducive to sediment hypoxia (Stanley et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

Patterns and Drivers of Dissolved Gas Concentrations and Fluxes Along a Low Gradient Stream

2022

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A significant fraction of the carbon fixed in terrestrial ecosystems is exported to streams as dissolved carbon dioxide (CO 2 ), methane (CH 4 ), dissolved organic matter, and particulate organic matter (Aufdenkampe et al., 2011). Rivers represent important landscape control points (sensu Bernhardt et al., 2017) by both actively mineralizing terrestrial organic matter and respiring it as CO 2 and CH 4 (Hotchkiss et al., 2015) and by transporting and degassing CO 2 and CH 4 from the terrestrial environment. Gaseous C emissions from freshwater ecosystems are increasingly recognized as an important component of regional and global carbon cycles, considerably offsetting estimates of terrestrial carbon sequestration (

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Carbon Dioxide and Methane Dynamics in a Peatland Headwater Stream: Origins, Processes and Implications

Abstract: Despite their relatively small surface area at the global scale, the recognition of running waters as biogeochemical hotspots has been growing over the last two decades (

Cited by 17 publications

References 105 publications

Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream

Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

Patterns and Drivers of Dissolved Gas Concentrations and Fluxes Along a Low Gradient Stream

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Carbon Dioxide and Methane Dynamics in a Peatland Headwater Stream: Origins, Processes and Implications

Abstract: Despite their relatively small surface area at the global scale, the recognition of running waters as biogeochemical hotspots has been growing over the last two decades (

Cited by 17 publications

References 105 publications

Stream respiration exceeds CO2 evasion in a low‐energy, oligotrophic tropical stream

Stream respiration exceeds CO2 evasion in a low‐energy, oligotrophic tropical stream

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

Patterns and Drivers of Dissolved Gas Concentrations and Fluxes Along a Low Gradient Stream

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Product

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Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream

Stream respiration exceeds CO₂ evasion in a low‐energy, oligotrophic tropical stream