The variation in growth ring arrangement of Iranian oak (Quercus brantii) trees and possibility of its application for climatic reconstructions was the subject of this study. It is the most frequent forest tree species in the Zagros. This research did cross two slopes (northern and southern sites) in the vicinity of Lordegan, Iran. Fifteen trees have been selected in each site and two boring cores were taken from every tree. Width measurement, cross dating and standardization techniques were carried out on the samples and finally the well aligned annual rings were synchronized with the correspondent climate data. The result shows the chronological similarities. The correlation between tree ring chronologies and climatic variables, including standardized drought index (SPI), evapotranspiration, precipitation, temperature and relative humidity were examined in monthly, annual, seasonal scale and growth periodical scales. Highest correlation was closely observed between the growth factors and relative humidity of September of the current year and previous year (0.74%); temperature of October of the current year and second previous year (-0.57%), precipitation of March of the current year (0.54%) and evapotranspiration of March of the current year and June of the third previous year (0.58%). Overall, the growth of Oak trees in the region significantly depend on the climatic changes during last three years.
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