Annual follow-up of gross diffusive carbon dioxide and methane emissions from a boreal reservoir and two nearby lakes in Québec, Canada

Demarty, M.; Bastien, Julie; Tremblay, Alain

doi:10.5194/bg-8-41-2011

Cited by 58 publications

(43 citation statements)

References 46 publications

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“…Under‐ice accumulation of biogenic gases during winter in boreal lakes has been reported to generate significant gas fluxes during the brief period of the spring thaw [ Demarty et al ., ; Kortelainen et al ., ], but this process has rarely been documented in flowing waters [ Dyson et al ., ]. We observed that the average end of winter p CO 2 and p CH 4 were both significantly higher than the ice‐free season concentrations (Figures a and b).…”

Section: Discussionmentioning

confidence: 99%

Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec

Campeau

Lapierre

Vachon

et al. 2014

Global Biogeochemical Cycles

102

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Boreal rivers and streams are known as hot spots of CO 2 emissions, yet their contribution to CH 4 emissions has traditionally been assumed to be negligible, due to the spatially fragmented data and lack of regional studies addressing both gases simultaneously. Here we explore the regional patterns in river CO 2 and CH 4 concentrations (pCO 2 and pCH 4 ), gas exchange coefficient (k), and the resulting emissions in a lowland boreal region of Northern Québec. Rivers and streams were systematically supersaturated in both gases, with both pCO 2 and pCH 4 declining along the river continuum. The k was on average low and increased with stream order, consistent with the hydrology of this flat landscape. The smallest streams (order 1), which represent < 20% of the total river surface, contributed over 35% of the total fluvial greenhouse gas (GHG) emissions. The end of winter and the spring thaw periods, which are rarely included in annual emission budgets, contributed on average 21% of the annual GHG emissions. As a whole, the fluvial network acted as significant source of both CO 2 and CH 4 , releasing on average 1.5 tons of C (CO 2 eq) yr À1 km À2 of landscape, of which CH 4 emissions contributed approximately 34%. We estimate that fluvial CH 4 emissions represent 41% of the regional aquatic (lakes, reservoirs, and rivers) CH 4 emissions, despite the relatively small riverine surface (4.3% of the total aquatic surface). We conclude that these fluvial networks in boreal lowlands play a disproportionately large role as hot spots for CO 2 and more unexpectedly for CH 4 emissions.

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Section: Discussionmentioning

confidence: 99%

Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec

Campeau

Lapierre

Vachon

et al. 2014

Global Biogeochemical Cycles

102

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“…The low emissions from open water are similar to those from reservoirs at higher or lower latitudes, but in those cases the littoral zone has not been investigated [29], [30]. Reservoirs differ enormously in the percentage of their area that can be deemed ‘littoral’.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Seasonal CH4 Flux in the Littoral Zone of Miyun Reservoir near Beijing: The Effects of Water Level and Its Fluctuation

et al. 2014

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Wetlands, and especially their littoral zones, are considered to be CH4 emissions hotspots. The recent creation of reservoirs has caused a rapid increase in the area of the world’s littoral zones. To investigate the effects of water depth and water level fluctuation on CH4 fluxes, and how these are coupled with vegetation and nutrients, we used static closed chamber and gas chromatography techniques to measure CH4 fluxes in the littoral zone of a large reservoir near Beijing, China, from November 2011 to October 2012. We found that CH4 flux decreased significantly along a transect from open water to dry land, from 3.1 mg m−2 h−1 at the deep water site to approximately 1.3 mg m−2 h−1 at the shallow water site, and less than 0.01 mg m−2 h−1 in the non-flooded area. Water level influenced CH4 flux by affecting soil properties including soil redox potential, soil carbon and nitrogen, and bulk density. The largest emission of all was from the seasonally flooded site after a flooding event (up to 21.1 mg m−2 h−1), which may have been caused by vegetation decomposition. Submerged sites had greater emissions, while the driest site had lower emissions. Immediately after the monthly measurements had been made, we removed the aboveground vegetation to enable an assessment of the gas transportation per unit of biomass. Removal of biomass decreased emissions by up to 53%. These results indicated the dominant effect of water depth on CH4 flux through effects of soil conditions, plant species composition and distribution. This study suggests that temporally flooded wetlands, including littoral zones, contribute significantly to the global CH4 burden. However, the current challenge is to capture their spatial extent and temporal variation in the fluxes.

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“…Hence, several studies have compared the amount of CO 2 emitted by these ecosystems to those from natural lakes (see e.g. Tremblay et al ., ; and references therein, Demarty et al ., ) to evaluate their warming potential, among other objectives. However, comparative analyses, in particular cross‐ecosystem comparisons, of lakes and reservoirs with respect to factors driving variation in CO 2 emissions are exceedingly scarce.…”

Section: Introductionmentioning

confidence: 98%

Assessing factors underlying variation of CO2 emissions in boreal lakes vs. reservoirs

Tadonléké

Marty

Planas

2011

FEMS Microbiol Ecol

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Reservoirs and lakes were compared to test the hypothesis that they are similar with respect to factors driving the variation in CO(2) emissions to the atmosphere. Understanding this variation is necessary for the assessment of the contribution of these freshwater ecosystems to the global carbon cycle. This study, in contrast to previous ones, included analyses of the relationships between CO(2) emissions and microbial communities. Pooled data (lakes and reservoirs) showed that variations in CO(2) emissions were strongly related to variations in temperature, dissolved organic matter (DOM) quality, and bacterial production (BP). Results also showed that lakes were characterized by higher water temperature, lower DOM quality, larger size of Daphnia, and enriched δ(13) C zooplankton compared to reservoirs. Moreover, interactions within plankton communities and relationships between CO(2) emissions and zooplankton δ(13) C signatures differed in lakes vs. reservoirs, indicating among-system type differences in food web structure and carbon cycling. As a result of these ecosystem-type characteristics, CO(2) emission variation was mainly explained by temperature and BP in lakes, and by DOM quality and the ratio of phytoplankton biomass to microheterotroph biomass in reservoirs. These results showed that differences in temperature and DOM quality between lakes and reservoirs translate into differences in microbial interactions and ultimately in the importance of factors driving CO(2) emissions to the atmosphere. They indicated that considering microbial communities and environmental variables such as temperature and DOM quality can help improve our understanding of the variation in CO(2) emissions from freshwater ecosystems.

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Annual follow-up of gross diffusive carbon dioxide and methane emissions from a boreal reservoir and two nearby lakes in Québec, Canada

Cited by 58 publications

References 46 publications

Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec

Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec

Spatial and Seasonal CH4 Flux in the Littoral Zone of Miyun Reservoir near Beijing: The Effects of Water Level and Its Fluctuation

Assessing factors underlying variation of CO2 emissions in boreal lakes vs. reservoirs

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Annual follow-up of gross diffusive carbon dioxide and methane emissions from a boreal reservoir and two nearby lakes in Québec, Canada

Cited by 58 publications

References 46 publications

Regional contribution of CO2 and CH4 fluxes from the fluvial network in a lowland boreal landscape of Québec

Regional contribution of CO2 and CH4 fluxes from the fluvial network in a lowland boreal landscape of Québec

Spatial and Seasonal CH4 Flux in the Littoral Zone of Miyun Reservoir near Beijing: The Effects of Water Level and Its Fluctuation

Assessing factors underlying variation of CO2 emissions in boreal lakes vs. reservoirs

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Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec

Regional contribution of CO₂ and CH₄ fluxes from the fluvial network in a lowland boreal landscape of Québec