Response of C and N cycles to N fertilization in Sphagnum and Molinia-dominated peat mesocosms

Leroy, Fabien; Gogo, Sébastien; Guimbaud, Christophe; Francez, André-Jean; Zocatelli, Renata; Défarge, Christian; Bernard-Jannin, Léonard; Hu, Zhen; Laggoun‐Défarge, Fatima

doi:10.1016/j.jes.2018.08.003

Cited by 13 publications

(12 citation statements)

References 29 publications

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“…where i (µmol CO 2 µmol −1 per photon) is the initial slope of the hyperbola, GPP max is the maximum GPP (µmol m −2 s −1 ) and PPFD is the photosynthetic photon flux density (µmol m −2 s −1 ). This approach was modified by Mahadevan et al (2008) and Kandel et al (2013) to include the effect of temperature and vegetation on the GPP model. The vegetation index was implemented (Mc leaves ) in the models after studying the relationship between GPP and photosynthetic photon flux density at different vegetation stages (described in Results; Figs.…”

Section: Gross Primary Productionmentioning

confidence: 99%

CO2 and CH4 budgets and global warming potential modifications in Sphagnum-dominated peat mesocosms invaded by Molinia caerulea

et al. 2019

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Plant communities play a key role in regulating greenhouse gas (GHG) emissions in peatland ecosystems and therefore in their ability to act as carbon (C) sinks. However, in response to global change, a shift from Sphagnumdominated to vascular-plant-dominated peatlands may occur, with a potential alteration in their C-sink function. To investigate how the main GHG fluxes (CO 2 and CH 4 ) are affected by a plant community change (shift from dominance of Sphagnum mosses to vascular plants, i.e., Molinia caerulea), a mesocosm experiment was set up. Gross primary production (GPP), ecosystem respiration (ER) and CH 4 emission models were used to estimate the annual C balance and global warming potential under both vegetation covers. While the ER and CH 4 emission models estimated an output of, respectively, 376 ± 108 and 7 ± 4 g C m −2 yr −1 in Sphagnum mesocosms, this reached 1018 ± 362 and 33 ± 8 g C m −2 yr −1 in mesocosms with Sphagnum rubellum and Molinia caerulea. Annual modeled GPP was estimated at −414±122 and −1273±482 g C m −2 yr −1 in Sphagnum and Sphagnum + Molinia plots, respectively, leading to an annual CO 2 and CH 4 budget of −30 g C m −2 yr −1 in Sphagnum plots and of −223 g C m −2 yr −1 in Sphagnum + Molinia ones (i.e., a C sink). Even if CH 4 emissions accounted for a small part of the gaseous C efflux (ca. 3 %), their global warming potential value makes both plant communities have a climate warming effect. The shift of vegetation from Sphagnum mosses to Molinia caerulea seems beneficial for C sequestra-tion at a gaseous level. However, roots and litter of Molinia caerulea could provide substrates for C emissions that were not taken into account in the short measurement period studied here.

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Section: Gross Primary Productionmentioning

confidence: 99%

CO2 and CH4 budgets and global warming potential modifications in Sphagnum-dominated peat mesocosms invaded by Molinia caerulea

et al. 2019

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“…To date, many peatlands have encountered degradation through anthropogenic activities such as grazing, draining, burning, and conversion to agriculture, industries, and urban areas, which reduce carbon uptake from the atmosphere (Waddington et al, 2010). Therefore, CH4 emissions from peatlands have taken interest from many researchers all over the world recently (Leroy et al, 2017;Huang et al, 2020;Saraswati and Strack, 2019).…”

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

Atmospheric Methane Condition over the South Sumatera Peatland during the COVID-19 Pandemic

Rendana

Idris

Rahim

2021

Aerosol Air Qual. Res.

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The degradation of peatlands through anthropogenic activities recently has contributed to low carbon uptake from the air. Peatlands are one of the largest sources of CH 4 (methane) emissions in terrestrial ecosystems, but during the COVID-19 pandemic with restriction policy was applied, it can affect the atmospheric CH4 concentration and change the atmospheric greenhouse gases. In Indonesia, the lockdown policy was known as the Large-Scale Social Restriction (LSSR) that was implemented in high COVID-19 case areas. In this study, the atmospheric CH4 concentration over the tropical peatlands in the South Sumatera Province of Indonesia was examined at three different periods such as before the COVID-19 pandemic (March and May 2019), before LSSR (March 2020), and during LSSR (May 2020). The CH4 concentration was measured using Atmospheric Infrared Sounder (AIRS) on NASA's Aqua Satellite, while the Gross Primary Production (GPP) was measured by the NASA's Moderate-resolution Imaging Spectroradiometer (MODIS) aboard the Terra Satellite. The results of the study revealed the average atmospheric CH4 concentration over the South Sumatera Peatland was about 1.73 ppm, which decreased by 5.5% during the LSSR period. Furthermore, GPP values were observed ranging from 53.3 to 63.9 g C m -2 day -1 during the LSSR which indicated high carbon uptake from the atmosphere. In conclusion, the LSSR application has significantly influenced the atmospheric CH4 over the peatlands through restriction of human activities such as land-use conversion, biomass burning, forest fire and etc.

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“…According to IPCC estimates (Ciais et al 2013) the contribution of natural mires into total natural methane emissions ranged between 61 and 82%. The intensity of GHG fluxes is controlled by different factors including the hydrological and thermal regime of the peat deposit (Naumov 2009;Sasakawa et al 2012;Helfter et al 2015;Molchanov 2015;Walker et al 2016;Glagolev et al 2017;Veretennikova and Dyukarev 2017;Leroy et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The study of the hydrological and ecological mechanisms controlling peatland response to climate changes is critical to predict potential feedbacks on the global C cycle (Baird et al 2012; The second assessment report… 2014). Recent field studies indicated that the peatland C balance represents a net C sink in intact peatlands in Canada (Wu et al 2010;Munir et al 2014;Webster et al 2018), China (zhu et al 2015zhou et al 2009), Finland (Laine et al 2019;Minkkinen et al 2018), Ireland (Swenson et al 2019), Scotland (Helfter et al 2015), Germany (Günther et al 2017), France (Leroy et al 2017), Poland (Acosta et al 2017), New zealand (Campbell et al 2014), East (Runkle et al 2013;Fleischer et al 2016;Eckhardt et al 2018;Davydov et al 2018) and Western part of Russia Kurganova et al 2011;Molchanov 2015;Ivanov et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Net Ecosystem Exchange, Gross Primary Production And Ecosystem Respiration In Ridge-Hollow Complex At Mukhrino Bog

Dyukarev

Godovnikov²,

Karpov³

et al. 2019

GES

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The continuous field measurements of net ecosystem exchange (NEE) of CO 2 were provided at ridge-hollow oligotrophic bog in the Middle Taiga zone of West Siberia, Russia in 2017-2018. The model of net ecosystem exchange of CO 2 was suggested to describe the influence of different environmental factors on NEE and to estimate the total carbon budget of the bog over the growing season. The model uses air and soil temperature, incoming photosynthetically active radiation (PAR) and water table depth, as the key factors influencing gross primary production (GPP) and ecosystem respiration (ER). The model coefficients were calibrated using the data collected by automated soil CO 2 flux system with two transparent long-term chambers placed at large hollow and small ridge sites. Experimental and modeling results showed that the Mukhrino bog acted over the study period as a carbon sink, with an average NEE of-87.7 gC m-2 at the hollow site and-50.2 gC m-2 at the ridge site. GPP was-344.8 and-228.5 gC m-2 whereas ER was 287.6 and 140.9 gC m-2 at ridge and hollow sites, respectively. Despite of a large difference in NEE estimates between 2017 and 2018 the growing season variability of NEE were quite similar.

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Response of C and N cycles to N fertilization in Sphagnum and Molinia-dominated peat mesocosms

Cited by 13 publications

References 29 publications

CO<sub>2</sub> and CH<sub>4</sub> budgets and global warming potential modifications in <i>Sphagnum</i>-dominated peat mesocosms invaded by <i>Molinia caerulea</i>

CO<sub>2</sub> and CH<sub>4</sub> budgets and global warming potential modifications in <i>Sphagnum</i>-dominated peat mesocosms invaded by <i>Molinia caerulea</i>

Atmospheric Methane Condition over the South Sumatera Peatland during the COVID-19 Pandemic

Net Ecosystem Exchange, Gross Primary Production And Ecosystem Respiration In Ridge-Hollow Complex At Mukhrino Bog

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Response of C and N cycles to N fertilization in Sphagnum and Molinia-dominated peat mesocosms

Cited by 13 publications

References 29 publications

CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; budgets and global warming potential modifications in &lt;i&gt;Sphagnum&lt;/i&gt;-dominated peat mesocosms invaded by &lt;i&gt;Molinia caerulea&lt;/i&gt;

CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; budgets and global warming potential modifications in &lt;i&gt;Sphagnum&lt;/i&gt;-dominated peat mesocosms invaded by &lt;i&gt;Molinia caerulea&lt;/i&gt;

Atmospheric Methane Condition over the South Sumatera Peatland during the COVID-19 Pandemic

Net Ecosystem Exchange, Gross Primary Production And Ecosystem Respiration In Ridge-Hollow Complex At Mukhrino Bog

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CO<sub>2</sub> and CH<sub>4</sub> budgets and global warming potential modifications in <i>Sphagnum</i>-dominated peat mesocosms invaded by <i>Molinia caerulea</i>

CO<sub>2</sub> and CH<sub>4</sub> budgets and global warming potential modifications in <i>Sphagnum</i>-dominated peat mesocosms invaded by <i>Molinia caerulea</i>