Bioindicators 1991

Lichen mappings can be used to gain integral insights into the general immission pollution over long periods of time. During passive lichen monitoring, the lichen vegetation naturally occurring on free-standing trees was examined in 1991 and evaluated with regard to the occurring species and their frequency. More information

In study areas with no distinct natural lichen vegetation, the exposure of foliose lichens serves to gauge the overall effect of immission factors. In 1981, 1991/92 and 1993/94, the foliose lichen Hypogymnia physodes was exposed to the prevailing air pollution at a multitude of measuring points. More information

The Scots Pine is an indigenous tree species. As an evergreen, it is very well suited for long-term passive monitoring studies. Ryegrass, as an accumulation indicator, is representative of other food and fodder plants. Lead and fluorine levels in needles and grass samples are presented here. More information

Kale is recognised as a standard plant for determining the effects of organic air pollutants. The map shows the relative exposure of the study area to organic pollutants along a West-East transect in autumn 1993. More information