Moss-nitrogen input to boreal forest soils: Tracking 15N in a field experiment |
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| Institution: | 1. School of the Environment, Natural Resources, & Geography, Bangor University, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;2. Department of Biology, Section of Microbial Ecology, Lund University, Lund, Sweden;3. Department of Biology, Terrestrial Ecology Section, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark;4. School of Environment and Forest Sciences, University of Washington, Box 352100, Seattle, WA, USA;1. Institute for Molecular Biosciences, Goethe University Frankfurt, Frankfurt, Germany;2. Frankfurt Institute of Advanced Studies, Frankfurt, Germany;3. Buchman Institute for Molecular Life Sciences, Goethe University Frankfurt, Frankfurt, Germany;1. Centre for Ecology and Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;2. Environmental Agency of Bolzano, Laives, Italy;3. International Sakharov Environmental University, Minsk, Belarus;4. National Botanical Garden, Academy of Science of Ukraine, Kiev, Ukraine;5. Alexandru Ioan Cuza University of Iasi, Iasi, Romania;6. Environment Agency, Argir, Faroe Islands;7. Veterinary and Agrochemical Research Centre, Tervuren, Belgium;8. Dunarea de Jos University of Galati, Galati, Romania;9. University of Santiago de Compestela, Santiago de Compostela, Spain;10. University of La Rioja, Logroño, Spain;11. Joint Institute for Nuclear Research, Dubna, Russian Federation;12. W. Szafer Institute of Botany, Polish Academy of Sciences, Krakow, Poland;13. Jožef Stefan Institute, Ljubljana, Slovenia;14. University of Tirana, Tirana, Albania;15. Muséum National d''Histoire Naturelle, Paris, France;p. Tallinn Botanic Garden, Tallinn, Estonia;q. Icelandic Institute of Natural History, Iceland;r. Institute of Landscape Ecology, Slovak Academy of Science, Bratislava, Slovakia;s. IVL Swedish Environmental Research Institute, Gothenburg, Sweden;t. Finnish Forest Research Institute, Oulu Research Unit, Oulu, Finland;u. University of Navarra, Pamplona, Spain;v. Slovenian Forestry Institute, Ljubljana, Slovenia;w. Oikon Ltd., Institute for Applied Ecology, Zagreb, Croatia;x. Ss. Cyril and Methodius University, Skopje, Macedonia;y. Norwegian University of Science and Technology, Trondheim, Norway;z. Valahia University of Targoviste, Targoviste, Romania;11. Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Pruhonice, Czech Republic;12. FUB-Research Group for Environmental Monitoring, Rapperswil, Switzerland;13. Technical University of Cluj-Napoca, Baia Mare, Romania;14. Institute of Botany, Bulgarian Academy of Sciences, Sofia, Bulgaria;15. University of Vienna, Department of Botany and Biodiversity Research, Vienna, Austria;1. Department of Forest Ecology & Management, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden;2. Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, SE-981 07, Abisko, Sweden;1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Environment and Health, Jianghan University, Wuhan 430056, China;4. Science Faculty, Tibet University, Lhasa 850000, China;1. College of Resources and Environment, Southwest University, Chongqing, 400715, China;2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China;3. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu, 610041, China |
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| Abstract: | Cyanobacteria living epiphytically on mosses in pristine, unpolluted areas fix substantial amounts of atmospheric nitrogen (N) and therefore represent a primary source of N in N-limited boreal forests. However, the fate of this N is unclear, in particular, how the fixed N2 enters the soil and becomes available to the ecosystem. In this study, we applied 15N-ammonium chloride (15N-NH4Cl) onto carpets of the feather moss Pleurozium schreberi and traced the 15N label into green (living) and brown (senescent) moss and into the upper soil layer over time. Further, we placed filters between moss and soil to assess the role of moss-associated fungi for N-transfer to the soil. The experiment was conducted at endpoints of a N2 fixation gradient in Northern Sweden. Feather moss retained the applied N in the green moss parts for up to 1 year and no increase of excess 15N was found in the brown moss parts or in the soil within that same time frame. The filter treatment did not alter the 15N-distribution in moss or soil. Nitrogen retention in the moss was similar regardless of position along the N2 fixation gradient. Our results suggest that mosses represent a short-term inorganic N sink and that transfer of N to the soil is not facilitated by fungal hyphae. |
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| Keywords: | Bryophytes Cyanobacteria Forest ecology N cycle N limitation Stable isotopes |
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