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

Journal of Environmental Sciences 2019年第3期31卷 264-272页

作者： Fabien Leroy Sébastien Gogo Christophe Guimbaud André-Jean Francez Renata Zocatelli Christian défarge Léonard Bernard-Jannin Zhen Hu fatima laggoun-défarge University of Orleans ISTO CNRS ISTO BRGM ISTO University of Orleans LPC2E CNRS LPC2E UMR CNRS 6553 ECOBIO University of Rennes 1 University of Orleans Cellule R&D CETRAHE School of Environmental Science and Engineering Shandong University

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_2O) 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_2O emissions, which were also controlled by the plant communities with the presence of Molinia caerulea reducing N_2O 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.

关键词： CO2 and CH4 N2O Peatland Plant community composition Sphagnum moss Graminoid

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