Effects of increased deposition of atmospheric nitrogen on an upland moor: nitrogen budgets and nutrient accumulation |
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Authors: | Pilkington M G Caporn S J M Carroll J A Cresswell N Lee J A Reynolds B Emmett B A |
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Affiliation: | Department of Environmental and Leisure Studies, Manchester Metropolitan University, MMU Cheshire, Crewe Green Road, Crewe, Cheshire, CW1 5DU, UK. m.g.pilkington@mmu.ac.uk |
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Abstract: | This study was designed to investigate the effect of long-term (11 years) ammonium nitrate additions on standing mass, nutrient content (% and kg ha(-1)), and the proportion of the added N retained within the different compartments of the system. The results showed that more than 90% of all N in the system was found in the soil, particularly in the organic (Oh) horizon. Added N increased the standing mass of vegetation and litter and the N content (kg N ha(-1)) of almost all measured plant, litter and soil compartments. Green tissue P and K content (kg ha(-1)) were increased, and N:P ratios were increased to levels indicative of P limitation. At the lowest treatment, most of the additional N was found in plant/litter compartments, but at higher treatments, there were steep increases in the amount of additional N in the underlying organic and mineral (Eag) horizons. The budget revealed that the proportion of added N found in the system as a whole increased from 60%, 80% and up to 90% in response to the 40, 80 and 120 kg N ha(-1) year(-1) treatments, respectively. |
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