Potential of Svalbard reindeer winter droppings for emission/absorption of methane and nitrous oxide during summer |
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| Institution: | 1. Carbon and Nutrient Cycles Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, 305-8604 Ibaraki, Japan;2. Department of Arctic and Marine Biology, University of Tromsø, N-9037 Tromsø, Norway;3. Arctic Centre, Groningen University, P.O. Box 716, 9700 AS Groningen, The Netherlands;4. Earth Observation Research Center, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, Japan;5. National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo, Japan;6. Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan |
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| Abstract: | Droppings of Svalbard reindeer (Rangifer tarandus platyrhynchus) could affect the carbon and nitrogen cycles in tundra ecosystems. The aim of this study was to evaluate the potential of reindeer droppings originating from the winter diet for emission and/or absorption of methane (CH4) and nitrous oxide (N2O) in summer. An incubation experiment was conducted over 14 days using reindeer droppings and mineral subsoil collected from a mound near Ny-Ålesund, Svalbard, to determine the potential exchanges of CH4 and N2O for combinations of two factors, reindeer droppings (presence or absence) and soil moisture (dry, moderate, or wet). A line transect survey was conducted to determine the distribution density of winter droppings at the study site. The incubation experiment showed a weak absorption of CH4 and a weak emission of N2O. Reindeer droppings originating from the winter diet had a negligible effect on the exchange fluxes of both CH4 and N2O. Although the presence of droppings resulted in a short-lasting increase in N2O emissions on day 1 (24 h from the start) for moderate and wet conditions, the emission rates were still very small, up to 3 μg N2O m−2 h−1. |
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| Keywords: | Carbon cycle Distribution density Gas exchange Nitrogen cycle Pellet-shaped droppings |
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