Factors influencing nitrous oxide and methane emissions from minerotrophic fens in northeast Germany |
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| Authors: | J Augustin W Merbach J Rogasik |
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| Institution: | Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada, N1G 2W1, CA
Canadian Forest Service, Great Lakes Forestry Centre, P.O.Box 490, 1219 Queen Street East, Sault Ste. Marie, Ontario, Canada, P6A 5M7 Tel: (705) 949-9461 x 2173; Fax: (705) 759-5700; e-mail: Iduchesne@foresty.ca, CA
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| Abstract: | At two field sites representing northeastern German minerotrophic fens (Rhin-Havelluch, a shallow peat site; Gumnitz, a partially
drained peat site) the influence of different factors (N fertilization, groundwater table, temperature) on N2O and CH4 emissions was investigated. The degraded fens were sources or sinks of the radiatively active trace gases investigated. The
gas fluxes measured were much higher than those found in other terrestrical ecosystems such as forests. Lowering the groundwater
table increased the release of N2O and the oxidation of CH4. High CH4 emission rates occurred when the groundwater tables and soil temperatures were high (>12 °C). N fertilization stimulated
the release of N2O only when application rates were very high (480 kg N ha–1). A moderate N supply (60 or 120 kg N ha–1) hardly increased the release of N2O in spite of high soluble soil NO3
– contents.
Received: 31 October 1997 |
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| Keywords: | Nitrous oxide Methane Minerotrophic fens Nitrogen fertilization Groundwater table |
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