U. Kirschbaum, U. Windisch and K. Hanewald 2010: Immissionsbezogene flechtenkartierungen in Hessen von 1992 bis 2007. [Long term lichen monitoring program in Hesse, Germany (period 1992 to 2007)]. - Gefahrstoffe Reinhaltung der Luft70(4): 135-140. [RLL List # 221 / Rec.# 32430] Keywords: GERMANY/ AIR POLLUTION/ HESSE/ BIOMONITORING
Abstract: ["Since the early 1990s the lichen species composition has changed considerably. The proportion of acidophytes decreased reflecting reduced sulphur dioxide immission. Conversely, the relevance of species with sensitivity towards air-borne contaminants (reference species) has increased. The greatest enhancement can be recognized for those lichen species that are promoted by eutrophication. This documents the rising effects of airborne nitrogen compounds." English abstract.]