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.
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