Uppföljande lavinventering runt Domsjö Fabriker

Sammanfattning: The lichen population in the vicinity of Domsjö factory, Örnsköldsvik, was studied since many common species seemed to be negatively affected. The first lichen inventory in Örnsköldsvik was done in 1960 and the last one was made in 1988. A connection between the effected lichen and the sulphur dioxide emission as well as the distance from Domsjö factory was then made. The purpose of this study was to investigate if any change could be found in the population of pendoulus lichen in the vicinity of Domsjö factory, Örnsköldsvik, since the last study dating back to 1988. This study investigated the following facts; which are presence, length, and at what height on the trees the lichen Alectoria sarmentosa, Bryoria capillaris and Usnea spp. Only lichen on spruce, with trunks bigger than 150mm at breast hight were also included in the inventory. The results are based on data from 42 sites. No connection between the Domsjö factory, and the presence of Bryoria capillaris could be made, while Usnea spp. still seem to be affected. The length and the height of the investigated lichen did not seem to be affected; by the distance from Domsjö factory nor by the inventoried tree structures. No samples of Alectoria sarmentosa were found in the inventory.