Abstract
The relationship between leaf injury and air pollutants of oxidants (Ox), NO, NO2, SO2 and suspended particles (SP) was statistically analysed using morning glory. The potted plant was grown in the eight monitoring stations of air pollutants in Ichihara and Sodegaura, Chiba Pref., in July of 1982 and 1983.
The results obtained were as follows:
1) There was no correlation between the degree of leaf injury and the concentration of single air pollutant.
2) The discriminant analysis was performed between the occurrence of leaf injury and the extent of air pollution using integrated values of Ox, NO, NO2, SO2, SP and numbers of existing leaves at each observation data. The obtained results showed that whether leaf injury occurred or not could be evaluated with the probability more than 90% by the discriminant analysis.
3) The multiple regression analysis demonstrated that there was a clear correlation between the degree of leaf injury and integrated values of five kinds of air pollutants on the day when the higher Ox concentration was, observed.
These results suggest that it is necessary to consider the influences of other pollutants besides Ox in order to analyse the effects of air pollutants in combination and the degree of leaf injury under field conditions.
