Abstract
Atmospheric deposition in a forest next to an intensively used agricultural area is measured by sampling throughfall, stemflow and open-field precipitation. Within 1 year 20 rain storms were sampled on an event basis. Concentrations in initial throughfall and dry and wet deposition fluxes to the soil of Ca, K, Mg, Na, NH4, CL, NO3, SO4 are given. Spatial variability op pH is shown. Concentrations in throughfall showed a large temporal variability. Maximum concentrations of NH4 and SO4 exceeded respectively 7 and 5 meq/1. Total nitrogen deposition on Douglas firs was for about 87% caused by dry deposition. Annual nitrogen fluxes to the forest floor ware mainly in the form of NH4. Throughfall pH and stemflow pH showed an increase at sample sites next to ammonia sources, probably caused by neutralisation by ammonia.
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