Air pollution is an essential issue for the environment and society in general. Tilia is a genus of over 20 species of deciduous trees that occur in forests in Europe, Asia and North America. Tilia varieties from Romania are frequently planted as ornamental trees in urban plantations along city streets. The spread of fungi depends practically on the weather conditions. The humidity and the active solar radiation influence the development of these pathogens more than the temperature. These spots usually become evident from the end of June to August. Infections of the leaves that begin at the beginning of the growing season can lead to premature defoliation. The points on the leaves frequently increase in number and size in late summer and early fall, as the leaves begin to fall. If it occurs over two or more successive years, it can seriously weaken a tree, reduce its growth, and increase its susceptibility to losing bark, injury and other diseases. The aim of this study is to emphasize the interactions between the concentrations of the heavy metals quantified in the foliar tissue of the linden trees and temperature, in specific conditions of different locations of Cluj-Napoca town, characterized by a series of different potential pollution sources. For the quantification of Cu, Zn, Pb, Cd and Ni from the leaf tissue of the Tilia cordata Mill. trees, monitored, the atomic absorption spectrometer (AAS) was used, respectively a Perkin-Elmer atomic absorption spectrometer (Perkin-Elmer, USA) with flame and graphite furnace. Data were statistically processed with STATISTICA v.8.0 for Windows. Throughout the experimental period, 2019, the increase of the pollution level does not positively influence the increase of the accumulations of Zn in the leaf tissue of the Tilia cordata Mill. trees taken in the study, in all experimental locations. The bioaccumulation capacity, however, positively favors the accumulations of Cu and Ni, but does not influence the bioaccumulations of Pb and Cd.

environment, heavy metals, pollution

environmental engineering

Presentation: poster