Carbon Balance and Spatial Variability of CO2 and CH4 Fluxes in a Sphagnum-Dominated Peatland in a Temperate Climate

D'Angelo, Benoît; Leroy, Fabien; Guimbaud, Christophe; Jacotot, Adrien; Zocatelli, Renata; Gogo, Sébastien; Laggoun‐Défarge, Fatima

doi:10.1007/s13157-021-01411-y

Cited by 6 publications

(8 citation statements)

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“…The La Guette peatland also acted as a C source with an output of 220 gC m −2 yr −1 between 2013 and 2014. The stronger C source in the field than our mesocosms was linked to the repeated droughts in the previous years (D'Angelo et al, 2021). However, in the study of Leroy et al (2019), both Sphagnum and Molinia caerulea dominated mesocosms collected from this peatland acted as gaseous C sink.…”

Section: Temperature and Water Table Depth Modulate The Peatland Functioningmentioning

confidence: 65%

Response of Peatland CO2 and CH4 Fluxes to Experimental Warming and the Carbon Balance

Gogo

Leroy

et al. 2021

Front. Earth Sci.

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The function of peatlands as a large carbon (C) reservoir results from the net C uptake under cold, wet, and acid environments. However, in the context of global warming, the balance between C input and release is expected to change, which may further alter the C sink of peatlands. To examine the response to climate warming of a temperate Sphagnum peatland which has been invaded by vascular plants, a mesocosm experiment was conducted with open top chambers (OTCs) to simulate a moderate temperature increase. Gross primary production (GPP), ecosystem respiration (ER), and methane (CH4) emissions were monitored for 2 years. The CO2 and CH4 fluxes were modeled by relating to abiotic and biotic factors, including temperature, water table depth (WTD), and vegetation, in order to calculate the annual C budget. Results showed that the annual cumulated GPP was significantly enhanced by the simulated warming (−602 compared to −501 gC m−2 yr−1 in OTC and control plots, respectively), mainly due to the increase of graminoid biomass by warming, while experimental warming had no significant effect on the annual ER and CH4 emissions (an output of 615 and 500 gC m−2 yr−1 for ER; 21 and 16 gC m−2 yr−1 for CH4 emissions in OTC and control plots, respectively). The annual NEE and C budget were not affected by the short-term experimental warming. The mesocosms under both treatments acted as a gaseous C source with 34 and 14 gC m−2 yr−1 output under OTC and control treatment, respectively. This C source was driven by the strong net carbon dioxide (CO2) release during a low WTD period in summer, as CH4 emissions only accounted for 0.9–2.2% of the total C fluxes. Our study identified the effect of moderate warming on the C fluxes, even on a short-term basis. Also, our findings highlighted that the response of C fluxes to warming largely depends on the WTD and vegetation composition. Thus, long-term monitoring of hydrology and vegetation change under climate warming is essential to examine their interactions in determining the C fluxes in peatlands.

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Section: Temperature and Water Table Depth Modulate The Peatland Functioningmentioning

confidence: 65%

Response of Peatland CO2 and CH4 Fluxes to Experimental Warming and the Carbon Balance

Gogo

Leroy

et al. 2021

Front. Earth Sci.

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“…The probe is inserted into the chamber and left between 2 and 5 min. Flux is calculated from the slope of the CO 2 concentration against time (D'Angelo et al, 2021).…”

Section: Sensor Characteristics and Data Acquisitionmentioning

confidence: 99%

“…Although peatlands function as a global C sink, they have switched locally to source systems (D'Angelo et al, 2021). This can have dramatic effects on climate change as a large amount of greenhouse gases (GHG) can be released into the atmosphere, thereby generating a positive feedback on temperature increase.…”

Section: Introductionmentioning

confidence: 99%

“…Peatlands are wetlands that cover only 3% of continental surfaces, but that contain between 17 and 27% of the world soil C stock (Jackson et al, 2017; Yu et al, 2010). Although peatlands function as a global C sink, they have switched locally to source systems (D'Angelo et al, 2021). This can have dramatic effects on climate change as a large amount of greenhouse gases (GHG) can be released into the atmosphere, thereby generating a positive feedback on temperature increase.…”

Section: Introductionmentioning

confidence: 99%

“…The probe is inserted into the chamber and left between 2 and 5 min. Flux is calculated from the slope of the CO 2 concentration against time(D'Angelo et al, 2021).4 | DATA FLOWFrom acquisition to accessibility, the data of the SNO Tourbières go through four stages (Figure2): (a) collection/storage; (b) processing;(c) integration into a database; (d) dissemination. The underlying principle of the SNO Tourbières information system is the findable, accessible, interoperable, re-usable (FAIR,Wilkinson et al, 2016) approach.1.…”

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The information system of the French Peatland Observation Service: Service National d'Observation Tourbières – A valuable tool to assess the impact of global changes on the hydrology and biogeochemistry of temperate peatlands through long term monitoring

Gogo

Paroissien

Laggoun‐Défarge

et al. 2021

Hydrological Processes

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Mitigating and adapting to global changes requires a better understanding of the response of the Biosphere to these environmental variations. Human disturbances and their effects act in the long term (decades to centuries) and consequently, a similar time frame is needed to fully understand the hydrological and biogeochemical functioning of a natural system. To this end, the ‘Centre National de la Recherche Scientifique’ (CNRS) promotes and certifies long‐term monitoring tools called national observation services or ‘Service National d'Observation’ (SNO) in a large range of hydrological and biogeochemical systems (e.g., cryosphere, catchments, aquifers). The SNO investigating peatlands, the SNO ‘Tourbières’, was certified in 2011 (https://www.sno-tourbieres.cnrs.fr/). Peatlands are mostly found in the high latitudes of the northern hemisphere and French peatlands are located in the southern part of this area. Thus, they are located in environmental conditions that will occur in northern peatlands in coming decades or centuries and can be considered as sentinels. The SNO Tourbières is composed of four peatlands: La Guette (lowland central France), Landemarais (lowland oceanic western France), Frasne (upland continental eastern France) and Bernadouze (upland southern France). Thirty target variables are monitored to study the hydrological and biogeochemical functioning of the sites. They are grouped into four datasets: hydrology, fluvial export of organic matter, greenhouse gas fluxes and meteorology/soil physics. The data from all sites follow a common processing chain from the sensors to the public repository. The raw data are stored on an FTP server. After operator or automatic processing, data are stored in a database, from which a web application extracts the data to make them available (https://data-snot.cnrs.fr/data-access/). Each year at least, an archive of each dataset is stored in Zenodo, with a digital object identifier (DOI) attribution (https://zenodo.org/communities/sno_tourbieres_data/).

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Interactions and Covariation of Ecological Drivers Control CO2 Fluxes in an Alpine Peatland

2023

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Peatland ecosystems are a highly effective long-term carbon sink. However, the CO2 fluxes could be substantially altered by climate changes and the fate of carbon stored in these ecosystems is still uncertain. Currently, most studies concerning the carbon fluxes in peatlands were performed at high latitude sites, where these ecosystems are more widely distributed compared to temperate regions, where peatlands are less frequent and, in addition to climate pressure, increasingly threatened by human activities. However, the information we have on these peatlands is very scarce. To fill this knowledge gap, we studied CO2 fluxes in an alpine peatland, through light and dark incubations. Using the natural variation in ecological conditions, we identified the main drivers of CO2 fluxes, considering in particular their interactions and covariation. Ecosystem respiration and gross primary production were primarily stimulated by the lowering of the water table and the amount of photosynthetic radiation, respectively, whereas net ecosystem CO2 exchange showed greater variation along the growing season. The influence on CO2 fluxes of the interactions between the drivers investigated, including soil temperature and moisture as well as vegetation type and plant functional diversity, was found to be of pivotal importance. Finally, a substantial part of the variation in CO2 emission and uptake processes was regulated by the joint variation of atmospheric and edaphic factors. To understand and predict the CO2 dynamics of alpine peatlands, it is necessary to consider the interplays among ecological factors, especially in relation to the expected changes in climate and vegetation.

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Carbon Balance and Spatial Variability of CO2 and CH4 Fluxes in a Sphagnum-Dominated Peatland in a Temperate Climate

Cited by 6 publications

References 46 publications

Response of Peatland CO2 and CH4 Fluxes to Experimental Warming and the Carbon Balance

Response of Peatland CO2 and CH4 Fluxes to Experimental Warming and the Carbon Balance

The information system of the French Peatland Observation Service: Service National d'Observation Tourbières – A valuable tool to assess the impact of global changes on the hydrology and biogeochemistry of temperate peatlands through long term monitoring

Interactions and Covariation of Ecological Drivers Control CO2 Fluxes in an Alpine Peatland

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