| Abstrakt: |
Population growth as well as increasing migration to cities in recent decades has led to increased population density as well as the area of large cities. Noise pollution is one of the environmental problems in big cities, which endangers human health in various psychological and physical aspects. However, this type of pollution has received less attention than other pollutants. This research was conducted with the aim of investigating and modeling the effect of tree species on road noise pollution. The present study was carried out in Noor Forest Park in which 6 stations including 5 different tree stands and one control area were selected for the study. Measurement of noise pollution was performed in each station with 5 replications at distance intervals of 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 meters from the sound source with two noise frequencies of 250 and 500 Hz in two seasons of winter and summer. The studied characteristics include tree species, distance from the sound source, growing season (summer and winter), and stand attributes including mean diameter at breast height, the average height of the stand, basal area per hectare, total basal area of trees from the sound source to the location of receiver. Based on the model selection criteria, the linear model showed the best fit for modeling the effect of environmental factors on the amount of noise pollution. Based on the results, the effect of distance, species, season, intensity of noise pollution and total basal area of trees on the amount of noise pollution were significant. The distance from the source of noise pollution and the total basal area of the trees showed an inverse relationship with the amount of noise pollution. The highest noise pollution was related to the control areas without trees and the lowest was related to the Gleditsia-Alnus mixed stands. It can be concluded that noise pollution can be reduced more effectively with optimal design through afforestation of mixed stands so that the species cover different floors, especially at a height close to the ground. [ABSTRACT FROM AUTHOR] |
