caa a22 4500 467886105 CHVBK 20180406152735.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10021-005-0070-1 doi (NATIONALLICENCE)springer-10.1007/s10021-005-0070-1 Sedge Succession and Peatland Methane Dynamics: A Potential Feedback to Climate Change [Elektronische Daten] [M. Strack, M. Waller, J. Waddington] Under the warmer climate, predicted for the future, northern peatlands are expected to become drier. This drying will lower the water table and likely result in reduced emissions of methane (CH4) from these ecosystems. However, the prediction of declining CH4 fluxes does not consider the potential effects of ecological succession, particularly the invasion of sedges into currently wet sites (open water pools, low lawns). The goal of this study was to characterize the relationship between the presence of sedges in peatlands and CH4 efflux under natural conditions and under a climate change simulation (drained peatland). Methane fluxes, gross ecosystem production, and dissolved pore water CH4 concentrations were measured and a vegetation survey was conducted in a natural and drained peatland near St. Charles-de-Bellechasse, Quebec, Canada, in the summer of 2003. Each peatland also had plots where the sedges had been removed by clipping. Sedges were larger, more dominant, and more productive at the drained peatland site. The natural peatland had higher CH4 fluxes than the drained peatland, indicating that drainage was a significant control on CH4 flux. Methane flux was higher from plots with sedges than from plots where sedges had been removed at the natural peatland site, whereas the opposite case was observed at the drained peatland site. These results suggest that CH4 flux was enhanced by sedges at the natural peatland site and attenuated by sedges at the drained peatland site. However, the attenuation of CH4 flux due to sedges at the drained site was reduced in wetter periods. This finding suggests that CH4 flux could be decreased in the event of climate warming due to the greater depth to the water table, and that sedges colonizing these areas could further attenuate CH4 fluxes during dry periods. However, during wet periods, the sedges may cause CH4 fluxes to be higher than is currently predicted for climate change scenarios. Springer Science+Business Media, Inc., 2006 peatland nationallicence ecological succession nationallicence vascular plant nationallicence methane flux nationallicence water table nationallicence Strack M. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut Waller M. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut Waddington J. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut Ecosystems Springer-Verlag; www.springer-ny.com 9/2(2006-03-01), 278-287 1432-9840 9:2<278 2006 9 10021 https://doi.org/10.1007/s10021-005-0070-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-005-0070-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Strack M. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut NATIONALLICENCE 700 1- Waller M. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut NATIONALLICENCE 700 1- Waddington J. School of Geography and Geology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/2(2006-03-01), 278-287 1432-9840 9:2<278 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer