caa a22 4500 445383925 CHVBK 20180317143026.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10021-011-9435-9 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9435-9 A Multi-Year Record of Methane Flux at the Mer Bleue Bog, Southern Canada [Elektronische Daten] [Tim Moore, Allison De Young, Jill Bubier, Elyn Humphreys, Peter Lafleur, Nigel Roulet] The Mer Bleue peatland is a large ombrotrophic bog with hummock-lawn microtopography, poor fen sections and beaver ponds at the margin. Average growing-season (May-October) fluxes of methane (CH4) measured in 2002-2003 across the bog ranged from less than 5mgm−2d−1 in hummocks, to greater than 100mgm−2d−1 in lawns and ponds. The average position of the water table explained about half of the variation in the season average CH4 fluxes, similar to that observed in many other peatlands in Canada and elsewhere. The flux varied most when the water table position ranged between −15 and −40cm. To better establish the factors that influence this variability, we measured CH4 flux at approximately weekly intervals from May to November for 5years (2004-2008) at 12 collars representing the water table and vegetation variations typical of the peatland. Over the snow-free season, peat temperature is the dominant correlate and the difference among the collars' seasonal average CH4 flux is partially dependent on water table position. A third important correlate on CH4 flux is vegetation, particularly the presence of Eriophorum vaginatum, which increases CH4 flux, as well as differences in the potential of the peat profile to produce and consume CH4 under anaerobic and aerobic conditions. The combination of peat temperature and water table position with vegetation cover was able to explain approximately 44% of the variation in daily CH4 flux, based on 1097 individual measurements. There was considerable inter-annual variation in fluxes, associated with varying peat thermal and water table regimes in response to variations in weather, but also by variations in the water level in peripheral ponds, associated with beaver dam activity. Raised water level in the beaver ponds led to higher water tables and increased CH4 emission in the peatland. Springer Science+Business Media, LLC, 2011 greenhouse gases nationallicence peatlands nationallicence wetlands nationallicence water table nationallicence Eriophorum vaginatum nationallicence Castor canadensis nationallicence Moore Tim Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut De Young Allison Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut Bubier Jill Mount Holyoke College, 50 College Street, 01075, South Hadley, Massachusetts, USA aut Humphreys Elyn Department of Geography and Environmental Studies, Carleton University, K1S 5B6, Ottawa, Ontario, Canada aut Lafleur Peter Department of Geography, Trent University, K9J7B8, Peterborough, Ontario, Canada aut Roulet Nigel Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut Ecosystems Springer-Verlag 14/4(2011-06-01), 646-657 1432-9840 14:4<646 2011 14 10021 https://doi.org/10.1007/s10021-011-9435-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9435-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moore Tim Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- De Young Allison Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Bubier Jill Mount Holyoke College, 50 College Street, 01075, South Hadley, Massachusetts, USA aut NATIONALLICENCE 700 1- Humphreys Elyn Department of Geography and Environmental Studies, Carleton University, K1S 5B6, Ottawa, Ontario, Canada aut NATIONALLICENCE 700 1- Lafleur Peter Department of Geography, Trent University, K9J7B8, Peterborough, Ontario, Canada aut NATIONALLICENCE 700 1- Roulet Nigel Department of Geography, and Global Environmental & Climate Change Centre, McGill University, 805 Sherbrooke St. W, H3A2K6, Montreal, Quebec, Canada aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/4(2011-06-01), 646-657 1432-9840 14:4<646 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer