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- Title
The prediction of nitrate leaching with the first-order acidity balance (FAB) model for upland catchment in Great Britain
- Authors
Allott, T. E. H.; Harriman, R.; Curtis, C. J.; Reynolds, B.
- Abstract
The relative contribution of N deposition to the acidification of freshwaters in Great Britain has increased over the last few years as Sdeposition has fallen in line with reduced emissions. In certain high deposition areas of Great Britain, NO3--based acidity can equal or exceed the contribution of SO42--based acidity in some upland waters.Here we apply the first-order acidity balance model (FAB) to predictthe maximum N leaching from 13 study catchments at future steady state. Using mean water chemistry and catchment soils data, along with long-term default values for N sink processes, we predict NO3-N leaching at much higher rates than currently are being measured in surface waters, with a mean increase of 10.5 kg ha-1 yr-1. As a result, mean acid neutralizing capacity would decline to less than 0 meq L-1 at 4 sites. While there are uncertainties associatedwith model parameterization relating to the short-term storage of N within catchment soils and vegetation, model outputs do indicate muchgreater leaching of N at some time in the future as steady-state is achieved.
- Subjects
UNITED Kingdom; MODELING (Sculpture); BIOGEOCHEMISTRY; ATMOSPHERIC deposition; ACIDIFICATION
- Publication
Water, Air & Soil Pollution, 1998, Vol 105, Issue 1-2, p205
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/a:1005041206407