By G. J. Heij, T. Schneider

This publication comprises the consequences and conclusions of in depth examine at the factors and results of acidification of forests/forest soils and heathland within the Netherlands. In 1985 the Dutch precedence Programme on Acidification used to be all started for you to provide a extra concrete shape to the expanding curiosity of policy-makers within the results of pollution on ecosystems specifically. within the final 3 years, the learn has thinking about acquiring a extra actual estimate of the emission of ammonia at the deposition of SOx, NOy and NHx, and likewise on quantifying results on woodland and heathland ecosystems. This quantification of results integrated experimental paintings version analyses, and derivation of severe rather a lot and degrees for wooded area and heathland ecosystems. moreover, state of affairs analyses have been made with the Dutch Acidification structures version (DAS) with the intention to overview the effectiveness of coverage measures. The study itself, which shaped the root for this publication, has been defined within the stories on person tasks. A precis of the clinical effects and conclusions is given in thematic experiences (added as annex).

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Extra resources for Acidification Research in The Netherlands: Final Report of the Dutch Priority Programme on Acidification

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Heij (RIVM) 1 . 1 Research questions In 1985 the Dutch Priority Programme on Acidification (Dutch abbreviation: APV) was established as a result of the awakening interest of policy makers in the field of the effects of air pollution on forests and other vegetations. The decline of forests in Germany and some parts of the Netherlands was probably one of the main stimuli in this development. Since 1985, almost all the research in the Netherlands on the effects of acidification has been coordinated within the Dutch priority Programme on Acidification.

Scenario 3 offers good prospects for such vegetations. The results for the period 2000 - 2025 for the areas with the highest load (over 3000 mol N ha-lyr-1)vary, however. In the period after that (from 2025 to 2050) Scenario 3 meets the target for all areas (Calluna remains the dominant species). For the period 2000 2050 Scenario 2 gives results which are between those of the Scenarios 1 and 3. With regard to wet heathland vegetations, calculationresults of Scenarios2 and 3 show that, at a sod-cutting frequency of once per 25 years, these vegetations can compete in all areas during the period 2000 - 2050.

As far as the above-mentioned effects are concerned, deposition reduction before 2000 is much more important than reduction after 2000, except in coastal areas, where the availability of N will become the growth-limiting factor after 2030. In other cases, the changes (and uncertainties) in the reaction of the forest will be dominated by the strong reduction in deposition between 1990 and 2000. 5 Effects on heathland To assess the effects of the different scenarios on the development of heathland vegetations, calculations have been made with the CALLUNA model for dry heathland and with the ERICA model for wet heathland, for 17 out of the 20 different Dutch acidification areas in which heathland is found.

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