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.
International audience
Mostrar más [+] Menos [-]Inglés. 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.
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