Aptroot, A 1990: Veranderingen in de epifytenflora van de povincie Utrecht over de priode 1984-1989. - Bureau Milieuinventarisatie, Utrecht. 27 pp. [RLL List # 140 / Rec.# 763] Keywords: NETHERLANDS/ UTRECHT/ EPIPHYTES/ SO2/ ACID RAIN/ AIR POLLUTION
Abstract: 13 tables. 30 maps. [An inventory of 19660 records from 2489 sites. "Comparison with similar records from 1984 showed that no major changes have occurred. The number of acidiphytic species shows a significant negative correlation with both the SO2 concentration and the NH3 emission, whereas the number of nitrophytic species shows a significant positive correlation with the NH3 emission."]
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