In present conditions, in which urban pollution generates many concerns at the level of international establishment involved in assuming decisions regarding Earths health, an important role is given for establishing and maintaining green areas located in cities. This presents a worthy sanogenic importance, especially when their presence involves the existence of ornamental trees, used frequently in urban spaces (chestnut, linden, pine) that can substantially contribute in improving air quality. Regarding the quantification of air quality influence upon physiological disease in trees, it was resorted to sample leaf tissue and / or needle from three species of ornamental trees, located in the proximity of two monitoring stations in Cluj-Napoca subjected to different intensity of pollution degrees, twice a week, during the experimental period April-September 2014-2015. At the Tillia cordata species, in the foliar tissue, weak correlations were found, positive between sulphur and nitrogen (R = +0.394, CLU-1; R = +0.312, CLU-4), implying that increased sulphur in foliar tissue leads to the increase of nitrogen for a proportion of total foliar tissue equal to related determination coefficients (15.5%; 9.7%). The results of the present research, demonstrate, in this way, that in Tilia cordata species is reported the biggest capacity of sulphur and nitrogen bioaccumulation, while in the species Pinus nigra, and Aesculus hippocastanum are reported the lowest capacities of sulphur and nitrogen bioaccumulation. Based on this results, we can recommend planting Tilia cordata species in urban areas where there is a risk of pollution caused by sulphur and nitrogen, due to its high capacity of monitoring air pollution in most of these macronutrients. Elements that give originality to this present research consists in the quantification and analysis of interactions between the sulphur and nitrogen content in leaf tissue / needle of tree species taken under study, through simple correlations between those two elements essential in the metabolism and intimate physiological mechanisms of vegetable tissue.

air quality, biomonitors, macronutrients, ornamental trees

Presentation: oral