By G. J. Heij, T. Schneider
This booklet comprises the implications and conclusions of in depth study at the factors and results of acidification of forests/forest soils and heathland within the Netherlands. In 1985 the Dutch precedence Programme on Acidification was once begun to be able to provide a extra concrete shape to the expanding curiosity of policy-makers within the results of pollution on ecosystems particularly. within the final 3 years, the examine has all for acquiring a extra exact estimate of the emission of ammonia at the deposition of SOx, NOy and NHx, and in addition on quantifying results on wooded area and heathland ecosystems. This quantification of results incorporated experimental paintings version analyses, and derivation of severe quite a bit and degrees for woodland and heathland ecosystems. moreover, state of affairs analyses have been made with the Dutch Acidification platforms version (DAS) so as to evaluation the effectiveness of coverage measures. The study itself, which shaped the root for this ebook, has been defined within the stories on person initiatives. A precis of the medical effects and conclusions is given in thematic stories (added as annex).
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Extra resources for Acidification Research in The Netherlands: Final Report of the Dutch Priority Programme on Acidification
Reviews (project 201). One of the disadvantages of an overall national research programme is the difficulty in obtaining independent reviews on the scientific results; funds have been allocated to provide for reviews by scientists from abroad. 3 Thematicreports and internationalreview In the course of 1990, the research results have been clustered into seven main themes: - emissions of NH3; - atmcsphericinput fluxes; - soil acidifcation I nitrogen cycling; - biological and physiological effects; - integrated effects (forests); - integrated effects (low vegetation); - integratedmodelling; - critical loads and levels.
2. From this table it is obvious that most ammonia is emitted by cattle. Furthermore, application of the manure is at present the largest source of the emissions. The calculated emission is based on the assumption that 50% of ammonia in the manure evaporates during and after spreading. As there is, amongst other things, no quantitative information about the conditions prevailing when farmers are spreading manure, it is not possible to make a more accurate calculation of the total ammonia emission due to manure spreading.
2mol, m-3 3) for deciduous forests on rich soils = 2400 4) these values are related to a depth of 2 m. ). For frost damage/diseases and nutrient imbalances a range rather than one single value is now given. For leaching of nitrate to groundwater, the values have remained nearly unchanged. Insufficient scientific support has been provided for the critical value for deciduous forest with regard to the criterion frost damage (1500 mol, ha-lyr-1)presented in the f i s t phase of the programme. This value has therefore not been included in this report.