Evaluating the effects of dust and intensity of oak charcoal disease on biological characteristics of Brant`s oak (Quercus brantii Lindl.) in the Ilam Province, Iran

Forest decline is the result of the interaction of factors such as climate, especially the occurrence of drought and early frost, tree age, habitat quality, pests and diseases, and the phenomenon of dust. The aim of this study was to measure the amount of dust particles deposited on oak in a forest stand in Ilam province and to investigate the biological characteristics of healthy trees and trees hosting oak charcoal disease. In order to measure biochemical traits, study of antioxidant activity and enzymes, amount of dry dust deposition on the leaf, random sampling was performed from different parts of the crown of each rootstock. On the leaves, sampling was randomly selected from different parts of the crown. The mean dry dust deposited per unit area of oak leaves for healthy and diseased trees during three sampling periods was 0.21 to 0.26 mg / cm. The amount of chlorophyll a, b, total and carotenoids in healthy and diseased trees was significantly different. 0.038, 0.06, 0.1 and 0.14 in healthy trees, respectively, more than 0.3, 0.05, 0.08 and 0.12 in diseased trees. Also, the amount of antioxidants and catalase in healthy trees were 56.9 and 0.01, respectively, with a significant difference greater than the diseased trees of 42.8 and 0.008. The amount of phenol and flavonoids in diseased trees (169.9 and 47.8) is more than healthy trees (114.5 and 36.6).