Comparison of greenhouse gas fluxes and nitrogen budgets from an ombotrophic bog in Scotland and a minerotrophic sedge fen in Finland

European Journal of Soil Science - Tập 61 Số 5 - Trang 640-650 - 2010
Julia Drewer1, Annalea Lohila2, Mika Aurela2, Tuomas Laurila2, Kari Minkkinen3, Timo Penttilä4, Kerry J. Dinsmore1, Rebecca McKenzie1, Carole Helfter1, Christophe Fléchard5, Mark A. Sutton1, U. Skiba1
1Centre for Ecology and Hydrology, Bush Estate, Penicuik EH26 0QB, UK
2Finnish Meteorological Institute, Climate Change Research, FI-00101 Helsinki, Finland
3Department of Forest Ecology, Peatland Ecology Group, University of Helsinki, FI-00014 Helsinki, Finland
4Vantaa Research Unit, Finnish Forest Research Institute, FI-01301 Vantaa, Finland
5Soils, Agronomy and Spatialization (SAS) Unit, INRA, 65 rue de St-Brieuc, 35042 Rennes Cedex, France

Tóm tắt

Northern peatlands cover approximately 4% of the global land surface area. Those peatlands will be particularly vulnerable to environmental and climate change and therefore it is important to investigate their total greenhouse gas (GHG) budgets, to determine the feedback on the climate. Nitrogen (N) is known to influence the GHG budget in particular by affecting the methane (CH4) balance. At two peatland sites in Scotland and Finland GHG fluxes of carbon dioxide (CO2), methane and nitrous oxide (N2O) and nitrogen fluxes were measured as part of the European project ‘NitroEurope’. The Scottish site, Auchencorth Moss, was a GHG sink of −321, −490 and −321 g CO2 eq m−2 year−1 in 2006, 2007 and 2008, respectively, with CO2 as the dominating GHG. In contrast, the dominating GHG at the Finnish site, Lompolojänkkä, was CH4, resulting in the site being a net GHG source of +485 and +431 g CO2 eq m−2 year−1 in 2006 and 2007, respectively. Therefore, Auchencorth Moss had a negative global warming potential (GWP) whilst Lompolojänkkä had a positive GWP over the investigated time period. Initial results yielded a positive N budget for Lompolojänkkä of 7.1 kg N ha−1 year−1, meaning the site was gaining nitrogen, and a negative N budget for Auchencorth Moss of −2.4 kg N ha year−1, meaning the site was losing nitrogen.

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Thông tin xuất bản

European Journal of Soil Science

Tập 61 Số 5

640-650

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