The Role of Nitrogen Deposition in Widespread Plant Community Change Across Semi-natural Habitats
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Experimental studies have shown that deposition of reactive nitrogen is an important driver of plant community change, however, most of these experiments are of short duration with unrealistic treatments, and conducted in regions with elevated ambient deposition. Studies of spatial gradients of pollution can complement experimental data and indicate whether the potential impacts demonstrated by experiments are actually occurring in the ‘real world’. However, targeted surveys exist for only a very few habitats and are not readily comparable. In a coordinated campaign, we determined the species richness and plant community composition of five widespread, semi-natural habitats across Great Britain in sites stratified along gradients of climate and pollution, and related these ecological parameters to major drivers of biodiversity, including climate, pollution deposition, and local edaphic factors. In every habitat, we found reduced species richness and changed species composition associated with higher nitrogen deposition, with remarkable consistency in relative species loss across ecosystem types. Whereas the diversity of mosses, lichens, forbs, and graminoids declines with N deposition in different habitats, the cover of graminoids generally increases. Considered alongside previous experimental studies and survey work, our results provide a compelling argument that nitrogen deposition is a widespread and pervasive threat to terrestrial ecosystems.
Keywordsnitrogen sulphur climate pollution impacts
The survey work and analysis were funded as part of the DEFRA/UKREATE umbrella project. RJP, NBD and SJMC were partially supported by the UK Natural Environment Research Council (NERC) through the European Union FP6 BiodivERsA (ERA-NET) project PEATBOG. The authors wish to thank Jane Hall and Ron Smith of the Centre of Ecology and Hydrology for provision of gridded pollutant data and the UK Met Office for gridded climate data (see below). Finally, the authors are grateful for the large number of people that helped out with the field surveys and the laboratory analysis associated with the project, and the numerous land owners, site managers, rangers and wardens for access permissions during the survey. © Crown Copyright 2009. The UK Climate Projections data (UKCP09) have been made available by the Department for Environment, Food and Rural Affairs (DEFRA) and Department for Energy and Climate Change (DECC) under licence from the Met Office, Newcastle University, University of East Anglia and Proudman Oceanographic Laboratory.
- Bobbink R, Hicks K, Galloway J, Spranger T, Alkemade R, Ashmore M, Bustamante M, Cinderby S, Davidson E, Dentener F, Emmett B, Erisman JW, Fenn M, Gilliam F, Nordin A, Pardo L, De Vries W. 2010. Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis. Ecol Appl 20:30–59.PubMedCrossRefGoogle Scholar
- Cunha A, Power SA, Ashmore MR, Green PRS, Haworth BJ, Bobbink R. 2002. Whole ecosystem nitrogen manipulation: an updated review. JNCC: 126.Google Scholar
- Dise N, Ashmore M, Belyazid S, Bleeker A, Bobbink R, De Vries W, Erisman JW, Spranger T, Stevens CJ, Van den Berg LJL. 2011. Nitrogen as a threat to European terrestrial biodiversity. In: Sutton M, Howard CM, Erisman JW, Billen G, Bleeker A, Grennfelt P, van Grinsman H, Grizzetti B, Eds. The European Nitrogen Assessment. Cambridge: Cambridge University Press. Google Scholar
- Duprè C, Stevens CJ, Ranke T, Bleeker A, Peppler-Lisbach C, Gowing DJG, Dise NB, Dorland E, Bobbink R, Diekmann M. 2010. Changes in species richness and composition in European acidic grasslands over the past 70 years: the contribution of cumulative atmospheric nitrogen deposition. Glob Change Biol 16:344–57.CrossRefGoogle Scholar
- Elkington T, Dayton N, Jackson DL, Strachan IM. 2001. National Vegetation Classification: field guide to mires and heaths. Peterborough: Joint Nature Conservation Committee.Google Scholar
- Emmett BA, Boxman D, Bredemeier M, Gundersen P, Kjønaas OJ, Moldan F, Schleppi P, Tietema A, Wright RF. 1998. Predicting the effects of atmospheric nitrogen deposition in conifer stands: evidence from the NITREX Ecosystem-Scale Experiments. Ecosystems 1(4):352–60.Google Scholar
- Erisman JW, van Grinsven H, Grizzetti B, Bouraoui F, Powlson D, Sutton MA, Bleeker A, Reis S. 2011. The European nitrogen problem in a global perspective. In: Sutton M, Howard CM, Erisman JW, Billen G, Bleeker A, Grennfelt P, van Grinsman H, Grizzetti B, Eds. The European Nitrogen Assessment. Cambridge: Cambridge University Press. Google Scholar
- European Nature Information System, European Environment agency. 2011.Google Scholar
- Fowler D, Smith R, Muller J, Cape JN, Sutton M, Erisman JW, Fagerli H. 2007. Long term trends in sulphur and nitrogen deposition in Europe and the cause of nonlinearities. In: Brimblecombe P, Hara H, Houle D, Novak M, Eds. Acid rain: deposition to recovery. Springer: Dordrecht. Google Scholar
- Jones L, Provins A, Harper-Simmonds L, Holland M, Mills G, Hayes F, Emmett BA, Hall J, Sheppard LJ, Smith R, Sutton M, Hicks K, Ashmore M, Haines-Young R. 2014. A review and application of the evidence for nitrogen impacts on ecosystem services. Ecosyst Services 7:76–88.Google Scholar
- Phoenix GK, Emmett BA, Britton AJ, Caporn SJM, Dise NB, Helliwell R, Jones L, Leake JR, Leith ID, Sheppard LJ, Sowerby A, Pilkington MG, Rowe EC, Ashmorek MR, Power SA. 2012. Impacts of atmospheric nitrogen deposition: responses of multiple plant and soil parameters across contrasting ecosystems in long-term field experiments. Glob Change Biol 18:1197–215.CrossRefGoogle Scholar
- Price EAC. 2003. Lowland Grassland and Heathland Habitats. London: Routledge.Google Scholar
- R Core Team. 2012. R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0. http://www.R-project.org/.
- RoTAP. 2012. Review of transboundary air pollution: acidification, eutrophication, ground level ozone and heavy metals in the UK. Contract Report to the Department for Environment, Food and Rural Affairs. Centre for Ecology & Hydrology.Google Scholar
- Sala OE, Chapin FS, Armesto JJ, Berlow E, Bloomfield J, Dirzo R, Huber-Sanwald E, Huenneke LF, Jackson RB, Kinzig A, Leemans R, Lodge DM, Mooney HA, Oesterheld M, Poff NL, Sykes MT, Walker BH, Walker M, Wall DH. 2000. Global biodiversity scenarios for the year 2100. Science 287(5459):1770–4.PubMedCrossRefGoogle Scholar
- Sheppard LJ, Leith ID, Crossley A, Van Dijk N, Fowler D, Sutton MA, Woods C. 2008. Stress responses of Calluna vulgaris to reduced and oxidised N applied under ‘real world conditions’. Environ Pollut 154(3):404–13.Google Scholar
- Stevens CJ, Duprè C, Dorland E, Gaudnik C, Gowing D, Bleeker A, Diekmann M, Alard D, Bobbink R, Fowler D, Corcket E, Mountford JO, Vandvik V, Aarrestad PA, Muller S, Dise NB. 2010. Nitrogen deposition threatens species richness of grasslands across Europe. Environ Pollut 158:2940–5.PubMedCrossRefGoogle Scholar
- Stevens C, Duprè C, Dorland E, Gaudnik C, Bleeker A, Alard D, Dise N, Bobbink R, Fowler D, Corcket E, Mountford JO, Vandvik V, Aarrestad P, Muller S, Diekmann M. 2011. Changes in species composition of European acid grasslands observed along an international gradient of nitrogen deposition. J Veg Sci 22(2):207–15.CrossRefGoogle Scholar
- ter Braak CJF, Smilauer P. 2004. Canoco Software for Windows 4.53. Biometris Plant Research International, Wageningen, The Netherlands.Google Scholar