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Toxicity to terrestrial arthropods

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Valid test results are available for two soil dwelling species, Collembola and Cryptostigmata (family Acarina, mites) (Heneghan and Bolger, 1996). Ammonium sulfate, simulating acid rain, was deposited in monthly applications at total amount of 708 kg ammonium sulfate/ha/year (=847 kg/ha/year Ammonium hydrogencarbonate) to a field planted with Picea abies. The soil fauna was extracted and counted twice, at the end of years 1 and 2. In the first year evaluation, a significant increase of the numbers of Cryptostigmata in the organic layer to more than double of control level was detected. In the second year, the abundances of Cryptostigmata were still high, but the differences to control were not significant. On both occasions the numbers of Collembola in the organic and top 6 cm mineral layers were significantly increased relative to controls.