Effects of Various Deposition Scenarios on the Aluminium Hydroxide Content ofDutch Forest Soils

摘要

Effects of four deposition scenarios up to 2010 (two scenarios) and 2050 (twoscenarios) on the Al hydroxide content of non-calcareous sandy forest soils in the Netherlands were calculated with a simple model, using a 10 x 10 km grid. The scenarios reflected the effects of policy measures to reduce sulphur and nitrogen emissions. Compared to expected emission reductions, additional measures only had a small effect on the predicted change in Al hydroxide content, except for forest soils near farms with intensive animal husbandry. Results showed that the relative decrease in Al hydroxide content was nearly always less than 50% for all scenarios. The median value was approximately 10%. Depletion of Al hydroxides was largest in areas with intensive animal husbandry but even here a depletion above 50% hardly occurred. However, Al depletion can be very fast (<10 to 20 years) in forest soils located near farms with intensive animal husbandry. (Copyright (c) 1993, SC-DLO.)