Phosphorus supply influences heathland responses to atmospheric nitrogen deposition |
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| Authors: | Pilkington M G Caporn S J M Carroll J A Cresswell N Lee J A Emmett B A Bagchi R |
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| Affiliation: | Department of Environmental and Leisure Studies, Manchester Metropolitan University, MMU Cheshire, Crewe, Cheshire, UK. m.g.pilkington@sheffield.ac.uk |
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| 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. |
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