Abstract
The ion transport through the Lange Bramke catchment is controlled by the trajectories of water flow through vertically stratified layers of soil. The size of the investigated catchment is 76 ha. The catchment is covered by a 35-year old Norway spruce stand ( Picea abies Karst.). Water trajectories through the sloping soils are provided by a physical model of transient saturated/unsaturated water flow. This finite element model calculates from given daily infiltration and potential transpiration rates the pressure head distribution in the cross-section of the watershed and the daily runoff. A model run from 1978 until 1981 agrees with measured daily sums of runoff at the weir and soil matric potential from various locations along the cross-section. The model results indicate that seepage under the spruce stand is characterized by a vertical direction within the first 80 cm of soil. Thus an ion budget for the subsoil can be calculated from monthly sums of seepage rates and means of soil solution chemistry from 80 cm depth. The chemical gradients between headwater, groundwater and runoff at Lange Bramke confirm the trajectories derived from the hydrological model and the ion budget for the subsoil.
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