Excess nitrogen leaching and C/N decline in the Tillingbourne catchment, southern England : INCA process modelling for current and historic time series
Whitehead, P.G; Lapworth, Daniel Joseph; Skeffington, R.A; Wade, A. 2002 Excess nitrogen leaching and C/N decline in the Tillingbourne catchment, southern England : INCA process modelling for current and historic time series. Hydrology and Earth System Sciences, 6 (3). 455-466.Before downloading, please read NORA policies.
Measurements of nitrate deposition and streamwater chemistry in the Tillingbourne Catchment, in Southern England, made in 1979-1982 and 1999-2001 show a 216% increase in Nitrogen leaching despite a reduction in N inputs. Both the historical and current data sets have been modelled using the Integrated Nitrogen Model in Catchments (INCA). The process based model is shown to reproduce the historical patterns of N release from the catchment. However, modelling the increased leaching of N during recent years required an increase of the mineralization control parameter in the model, suggesting enhanced mineralization rates. Comparing historic and current soils data for C/N ratios shows that there has been a reduction in C/N from 38 to 26 in the humus layer and a reduction from 33 to 26 in the mineral soil horizon. This significant fall in C/N is consistent with the increase in N saturation in the H and Ah horizons of the major catchment soil.
|Programmes:||BGS Programmes > Groundwater Management|
|Additional Keywords:||GroundwaterBGS, Groundwater, Nitrate pollution|
|NORA Subject Terms:||Agriculture and Soil Science
|Date made live:||07 Oct 2008 08:44|
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