aciddeposition acidrain agriculturalecology air airpollution analysis ascomycetes bryophytes congresses control ecology effectofaciddepositionon effectofacidprecipitationon environmentalaspects environmentalconditions forestdeclines forestecology forestsandforestry frankfurtammain fungi germany greatbritain lichens measurement plantdiseases plantecology plantindicators plants pollution prevention sb745a2981974 trees urbanecology(biology) wa754h395l1976 wetlandecology woundsandinjuries