Uso de los líquenes como bioindicadores de la calidad del aire: estado de la Ciudad Universitaria (Madrid, España)

Sampling 11 plots on Pinus phorophytes in Ciudad Universitaria and 3 control plots in Monte de El Pardo the effects of pollution in Ciudad Universitaria are studied. Although the indexes of diversity and atmospheric quality show the absence of diversity loss, composition reveals the marked effects of fires, eutrophication and bark basification. The lichen flora is relatively homogeneous, with abundance of nitrophilous and toxitolerant species. These effects are mainly due to the presence of particulate matter and nitrogen dioxide. Although, the values of degradation are moderated by it privileged location.