title: Phosphorus supply influences heathland responses to atmospheric nitrogen deposition.
abstract: On an upland moor dominated by pioneer Calluna vulgaris and with an understorey of mosses and lichens, experimental plots were treated with factorial combinations of nitrogen (N) at +0 and +20kg Nha(-1)yr(-1), and phosphorus (P) at +0 and +5kg Pha(-1)yr(-1). Over the 4-year duration of the experiment, the cover of the Calluna canopy increased in density over time as part of normal phenological development. Moss cover increased initially in response to N addition but then remained static; increases in cover in response to P addition became stronger over time, eventually causing reductions in the cover of the dominant Calluna canopy. Lichen cover virtually disappeared within 4 years in plots receiving +20kg Nha(-1)yr(-1) and also in separate plots receiving +10kg Nha(-1)yr(-1), but this effect was reversed by the addition of P.
authors.affiliation: Department of Environmental and Leisure Studies, Manchester Metropolitan University, MMU Cheshire, Crewe, Cheshire, UK. m.g.pilkington@sheffield.ac.uk
authors.forename: M G
authors.initials: MG
authors.lastname: Pilkington
authors.forename: S J M
authors.initials: SJ
authors.lastname: Caporn
authors.forename: J A
authors.initials: JA
authors.lastname: Carroll
authors.forename: N
authors.initials: N
authors.lastname: Cresswell
authors.forename: J A
authors.initials: JA
authors.lastname: Lee
authors.forename: B A
authors.initials: BA
authors.lastname: Emmett
authors.forename: R
authors.initials: R
authors.lastname: Bagchi
mesh_terms: D000393:Air Pollutants; D044002:Bryophyta / Q000254:growth & development; D029795:Calluna / Q000254:growth & development*; D004463:Ecology / Q000379:methods; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods; D005308:Fertilizers; D005843:Geography; D008011:Lichens / Q000254:growth & development; D009584:Nitrogen; D010758:Phosphorus; D013995:Time; D006113:United Kingdom
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen