Impacts of nitrogen deposition on vascular plants in Britain: an analysis of two national observation networks

Henrys, P.A.; Stevens, C.J.; Smart, S.M.; Maskell, L.C.; Walker, K.J.; Preston, C.D.; Crowe, A.; Rowe, E.C.; Gowing, D.J.; Emmett, B.A.. 2011 Impacts of nitrogen deposition on vascular plants in Britain: an analysis of two national observation networks. Biogeosciences, 8 (12). 3501-3518.

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Large areas of Great Britain currently have nitrogen (N) deposition at rates which exceed the thresholds above which there is risk of damage to sensitive components of the ecosystem (critical loads). Previous studies have focussed primarily on the relationship of species richness to nitrogen, whereas here we look at individual species. We used data from two national observation networks over Great Britain to examine the response of individual vascular plant species to N in acid grasslands, calcareous grasslands and heathlands. Presence absence records of individual species, along with mean Ellenberg N scores, within 10 km hectads were modelled against N deposition whilst at the same time controlling for the effects of climate, land use and sulphur deposition using generalised additive models. Ellenberg N showed a significant increase with increasing N deposition in almost all habitats across both surveys indicating increased fertility. Many individual species showed strong relationships with N deposition and clear negative trends in species prevalence to increasing nitrogen were found in all habitats. A number of these species were either habitat dominants or possessed traits known to be influential in controlling ecosystem function. Many community dominants showing significant negative relationships with N deposition highlight a potentially significant loss of function. Some species that showed negative relationships to N showed signs of decline at low levels, far below the current critical load levels. Some species also showed continuous changes as N deposition levels rose above the current critical load values. This work contributes to the growing evidence base suggesting species level impacts at low N deposition values.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry
UKCEH and CEH Sections/Science Areas: Pywell
ISSN: 1726-4170
Additional Information. Not used in RCUK Gateway to Research.: Open Access article - click on the Official URL link for full text
NORA Subject Terms: Botany
Biology and Microbiology
Date made live: 01 Dec 2011 13:00 +0 (UTC)

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