NDFF monitoring epiphytic lichens and moss species

Provincial authorities and other institutions have been monitoring epiphytic lichens and moss species since 1979 to measure the effects of air pollution. The monitoring programs work with plots of 10 trees (with some exceptions). All species are noted on a form, along with their abundance. Each plot visit takes about half an hour. Visits are repeated every 3 to 10 years. The monitoring program is only carried out by professional, trained observers. Dataset available via https://www.ndff.nl/english / [e-mail] Positive observations without zeros. 114,806 records (March 2018) NDFF protocol 1.203 https://www.ndff.nl/overdendff/validatie/protocollen/2-203-provinciale-epifytenmeetnet-mossen-en-korstmossen/