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Dive into the research topics where Léonard Bernard-Jannin is active.

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Featured researches published by Léonard Bernard-Jannin.


Biogeosciences Discussions | 2017

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

Fabien Leroy; Sébastien Gogo; Christophe Guimbaud; Léonard Bernard-Jannin; Xiaole Yin; Guillaume Belot; Wang Shu-guang; Fatima Laggoun-Défarge

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 (CO2 and CH4) 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 CH4 emission models were used to estimate the annual C balance and global warming potential under both vegetation covers. While the ER and CH4 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 CO2 and CH4 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 CH4 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 sequestration 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.


Ecological Engineering | 2017

Spatio-temporal analysis of factors controlling nitrate dynamics and potential denitrification hot spots and hot moments in groundwater of an alluvial floodplain

Léonard Bernard-Jannin; Xiaoling Sun; Samuel Teissier; Sabine Sauvage; José-Miguel Sánchez-Pérez


Advances in Water Resources | 2016

Spatially distributed modelling of surface water-groundwater exchanges during overbank flood events – a case study at the Garonne River

Léonard Bernard-Jannin; David Brito; Xiaoling Sun; Eduardo Jauch; Ramiro Neves; Sabine Sauvage; José-Miguel Sánchez-Pérez


Ecological Engineering | 2017

Biodiversity and ecosystem purification service in an alluvial wetland

Jingmei Yao; José Miguel Sánchez-Pérez; Sabine Sauvage; Samuel Teissier; Eleonore Attard; Béatrice Lauga; Robert Duran; Frédéric Julien; Léonard Bernard-Jannin; Hashradah Ramburn; Magali Gerino


Soil Biology & Biochemistry | 2017

Vegetation composition controls temperature sensitivity of CO2 and CH4 emissions and DOC concentration in peatlands

Fabien Leroy; Sébastien Gogo; Christophe Guimbaud; Léonard Bernard-Jannin; Zhen Hu; Fatima Laggoun-Défarge


Ecological Engineering | 2017

Assessment of the denitrification process in alluvial wetlands at floodplain scale using the SWAT model

Xiaoling Sun; Léonard Bernard-Jannin; Sabine Sauvage; Cyril Garneau; Jeffrey G. Arnold; Raghavan Srinivasan; José-Miguel Sánchez-Pérez


Water | 2018

Using SWAT-LUD Model to Estimate the Influence of Water Exchange and Shallow Aquifer Denitrification on Water and Nitrate Flux

Xiaoling Sun; Léonard Bernard-Jannin; Youen Grusson; Sabine Sauvage; Jeffrey G. Arnold; Raghavan Srinivasan; José Sánchez Pérez


The EGU General Assembly | 2017

Role of litter decomposition sensitivity to water content in non-additive litter mixture effect: theoretical demonstration and validation with a peatland litter experiment.

Sébastien Gogo; Fabien Leroy; Renata Zocatelli; Léonard Bernard-Jannin; Fatima Laggoun-Défarge


Journal of Environmental Sciences-china | 2018

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

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


Ecological Engineering | 2018

Modelling the role of riverbed compartments in the regulation of water quality as an ecological service

Sabine Sauvage; José-Miguel Sánchez-Pérez; Philippe Vervier; Robert-Joseph Naiman; Hugues Alexandre; Léonard Bernard-Jannin; Stéphanie Boulêtreau; Sébastien Delmotte; Frédéric Julien; Dimitri Peyrard; Xiaoling Sun; Magali Gerino

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Fabien Leroy

Centre national de la recherche scientifique

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Stéphane Binet

University of Franche-Comté

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