Nielsen, Knud Erik4; Andersen, Helle Vibeke1; Strandberg, Morten Tune4; Løfstrøm, Per5; Degn, Hans Jørgen6; Damgaard, Christian Frølund7
1 Danish Building Research Institute, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science (ENG), Aalborg University, VBN3 Construction and health (CH), The Faculty of Engineering and Science, Aalborg University, VBN4 Institut for Bioscience - Plante- og insektøkologi5 Institut for Miljøvidenskab - Atmospheric modeling6 unknown7 Afdeling for Terrestrisk Økologi
From April 2006 to April 2007, the geographical and seasonal variation in nitrogen content in terricolous lichen (Cladonia portentosa) and atmospheric ammonia concentrations were measured at five heathland sites. The seasonal variation in the nitrogen content of the lichen was small, even though there was a large seasonal variation in the air concentration of ammonia. A sizable local variation in the nitrogen content of the lichen was found even at the scale of a few kilometres. The nitrogen content in the lichen showed a high correlation to the yearly mean value of the measured ammonia concentration in air at the different locations. This investigation is part of a larger attempt to incorporate effects of nitrogen in the conservation status of terrestrial habitat types.
Water, Air and Soil Pollution, 2014, Vol 225, Issue 11 (November)