Climatic modifiers of the response to nitrogen deposition in peat-forming Sphagnum mosses: a meta-analysis
2011
Limpens, Juul | Granath, Goran | Gunnarsson, Urban | Aerts, Rien | Bayley, Stephan | Bragazza, Luca | Bubier, J. | Buttler, Alexandre | van den Berg, Leon Jl | Francez, Andre-Jean | Gerdol, Renato | Grosvernier, Philippe | Heijmans, Monique M.P.D. | Hoosbeek, M. R. | Hotes, Stephan | Ilomets, Mati | Leith, Ian | Mitchell, Edward A. D. | Moore, T. | Nilsson, Marcus | Nordbakken, Jorn-Frode | Rochefort, Line | Rydin, H. | Sheppard, L. J. | Thormann, Markus N. | Wiedermann, Magdalena M. | Williams, B.L. | Xu, B. | Nature Conservation and Plant Ecology group ; Nature Conservation and Plant Ecology Group | Dept of Systems Ecology ; University of Amsterdam [Amsterdam] = Universiteit van Amsterdam (UvA) | Laboratoire des systèmes écologiques (ECOS) ; Ecole Polytechnique Fédérale de Lausanne (EPFL) | WSL Lausanne ; WSL | Università degli Studi di Ferrara = University of Ferrara (UniFE) | Laboratoire Chrono-environnement (UMR 6249) (LCE) ; Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) ; Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC) | Aquatic Ecology and Environmental Biology ; Radboud University [Nijmegen] | Environment ; University of York [York, UK] | Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) ; Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des sciences de l'environnement de Rennes (OSERen) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | LIN'eco ; LIN'eco | Wageningen University and Research [Wageningen] (WUR) | Wetlands Research Group ; Swiss Federal Institute for Forest, Snow and Landscape Research WSL | Uppsala University | Centre de Recherches Nordiques ; Université Laval [Québec] (ULaval) | Department of Plant Ecology and Evolution ; Uppsala University | Centre for Ecology & Hydrology - Bush Estate ; Natural Environment Research Council (NERC) | Northern Forestry Centre ; Canadian Forest Service - CFS (CANADA) | Soils Group ; Macaulay Institute
International audience
显示更多 [+] 显示较少 [-]英语. Peatlands in the northern hemisphere have accumulated more atmospheric carbon (C) during the Holocene than any other terrestrial ecosystem, making peatlands long-term C sinks of global importance. Projected increases in nitrogen (N) deposition and temperature make future accumulation rates uncertain. * Here, we assessed the impact of N deposition on peatland C sequestration potential by investigating the effects of experimental N addition on Sphagnum moss. We employed meta-regressions to the results of 107 field experiments, accounting for sampling dependence in the data. * We found that high N loading (comprising N application rate, experiment duration, background N deposition) depressed Sphagnum production relative to untreated controls. The interactive effects of presence of competitive vascular plants and high tissue N concentrations indicated intensified biotic interactions and altered nutrient stochiometry as mechanisms underlying the detrimental N effects. Importantly, a higher summer temperature (mean for July) and increased annual precipitation intensified the negative effects of N. The temperature effect was comparable to an experimental application of almost 4 g N m)2 yr)1 for each 1°C increase. * Our results indicate that current rates of N deposition in a warmer environment will strongly inhibit C sequestration by Sphagnum-dominated vegetation.
显示更多 [+] 显示较少 [-]