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The impact of nitrogen deposition on acid grasslands in the Atlantic region of Europe
Authors:Stevens Carly J  Duprè Cecilia  Dorland Edu  Gaudnik Cassandre  Gowing David J G  Bleeker Albert  Diekmann Martin  Alard Didier  Bobbink Roland  Fowler David  Corcket Emmanuel  Mountford J Owen  Vandvik Vigdis  Aarrestad Per Arild  Muller Serge  Dise Nancy B
Institution:
  • a Department of Life Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
  • b Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
  • c Institute of Ecology, FB 2, University of Bremen, Leobener Str., DE-28359 Bremen, Germany
  • d Ecology & Biodiversity Group, Department of Biology, Institute of Environmental Biology, Utrecht University, PO Box 80.058, 3508 TB Utrecht, The Netherlands
  • e University of Bordeaux 1, UMR INRA 1202 Biodiversity, Genes and Communities, Equipe Ecologie des Communautés, Bâtiment B8 - Avenue des Facultés, F-33405 Talence, France
  • f Department of Air Quality & Climate Change, Energy Research Centre of the Netherlands, PO Box 1, 1755 ZG Petten, The Netherlands
  • g B-WARE Research Centre, Radboud University, PO Box 9010, 6525 ED Nijmegen, The Netherlands
  • h NERC Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
  • i NERC Centre for Ecology & Hydrology, MacLean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK
  • j Department of Biology, University of Bergen, Box 7800, N-5020 Bergen, Norway
  • k Norwegian Institute for Nature Research, PO Box 5685, Sluppen, NO-7485 Trondheim, Norway
  • l Laboratoire des Interactions Ecotoxicologie, Biodiversité et Ecosystèmes (LIEBE), UMR CNRS 7146, U.F.R. Sci. F.A., Campus Bridoux, Université Paul Verlaine, Avenue du Général Delestraint F 57070 Metz, France
  • m Department of Environmental and Geographical Science, Manchester Metropolitan University, Manchester M1 5GD, UK
  • Abstract:A survey of 153 acid grasslands from the Atlantic biogeographic region of Europe indicates that chronic nitrogen deposition is changing plant species composition and soil and plant-tissue chemistry. Across the deposition gradient (2-44 kg N ha−1 yr−1) grass richness as a proportion of total species richness increased whereas forb richness decreased. Soil C:N ratio increased, but soil extractable nitrate and ammonium concentrations did not show any relationship with nitrogen deposition. The above-ground tissue nitrogen contents of three plant species were examined: Agrostis capillaris (grass), Galium saxatile (forb) and Rhytidiadelphus squarrosus (bryophyte). The tissue nitrogen content of neither vascular plant species showed any relationship with nitrogen deposition, but there was a weak positive relationship between R. squarrosus nitrogen content and nitrogen deposition. None of the species showed strong relationships between above-ground tissue N:P or C:N and nitrogen deposition, indicating that they are not good indicators of deposition rate.
    Keywords:Atmospheric nitrogen deposition  Plant functional group  Plant-tissue nitrogen  Soil C:N  Soil pH
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