%0 Journal Article %T Response of C and N cycles to N fertilization in Sphagnum and Molinia-dominated peat mesocosms %+ Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) %+ Biogéosystèmes Continentaux - UMR7327 %+ Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) %+ Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) %+ CETRAHE %+ School of Environmental Science and Engineering, Shandong University %A Leroy, Fabien %A Gogo, Sébastien %A Guimbaud, Christophe %A Francez, Andre-Jean %A Zocatelli, Renata %A Défarge, Christian %A Bernard-Jannin, Léonard %A Hu, Zhen %A Laggoun-Défarge, Fatima %Z PIVOTS project by the Région centre Val de Loire - ARD 2020 - CPER 2015-2020 %< avec comité de lecture %@ 1001-0742 %J Journal of Environmental Sciences %I Elsevier %V Accepted %P 8 pages %8 2018-08 %D 2018 %R 10.1016/j.jes.2018.08.003 %K CO2 and CH4 %K N2O %K Peatland %K Plant community composition %K Sphagnum moss %K Graminoid %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Continental interfaces, environmentJournal articles %X Plant communities play an important role in the C-sink function of peatlands. However, global change and local perturbations are expected to modify peatland plant communities, leading to a shift from Sphagnum mosses to vascular plants. Most studies have focused on the direct effects of modification in plant communities or of global change (such as climate warming, N fertilization) in peatlands without considering interactions between these disturbances that may alter peatlands' C function. We set up a mesocosm experiment to investigate how Greenhouse Gas (CO 2 , CH 4 , N 2 O) fluxes, and dissolved organic carbon (DOC) and total dissolved N (TN) contents are affected by a shift from Sphagnum mosses to Molinia caerulea dominated peatlands combined with N fertilization. Increasing N deposition did not alter the C fluxes (CO 2 exchanges, CH 4 emissions) or DOC content. The lack of N effect on the C cycle seems due to the capacity of Sphagnum to efficiently immobilize N. Nevertheless, N supply increased the N 2 O emissions, which were also controlled by the plant communities with the presence of Molinia caerulea reducing N 2 O emissions in the Sphagnum mesocosms. Our study highlights the role of the vegetation composition on the C and N fluxes in peatlands and their responses to the N deposition. Future research should now consider the climate change in interaction to plants community modifications due to their controls of peatland sensitivity to environmental conditions. %G English %2 https://insu.hal.science/insu-01864513v1/document %2 https://insu.hal.science/insu-01864513v1/file/1-s2.0-S100107421732260X-main.pdf %L insu-01864513 %U https://insu.hal.science/insu-01864513