The determination of NH3-concentration gradients in a spruce forest using a passive sampling technique |
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| Authors: | E H Adema V Mejst??k B Binek |
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| Institution: | 1. Department of Air Pollution, Wageningen Agricultural University, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands
2. Institute of Landscape Ecology/Biological Center, Brani?ovská 31, 37005, ?eské Budějovice, Czechoslovakia
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| Abstract: | In order to estimate the influence of NH3 on a forest in a clean atmosphere, the quality of the atmosphere in Sumava, South-Bohemia, was determined in September–October 1988. In this period the NOX, SO2, and aerosol concentrations were extremely low. The N-input into the forest margin amounted to 10–15 kg ha?1 in these two months, based on a deposition velocity of 3 cm s?1 and an average concentration of 9 μg m?3 NH3. The maximum hourly average ozone concentrations were found to be 50 to 100 μg m?3. There exists a strong relation between the ambient NH3 concentration profiles and the stable occupation. The concentration inside the stables exceeded the no-adverse-effect level for cows of 7.6 mg m?3. This publication forms the basis for the estimation of the exposure of the forest to NH3 and the interpretation of the observed effects as published elsewhere (Mejst?ík et al., unpublished). |
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