Reconstruction of Jan-Mar mean temperature using tree ring widths of Juniper trees in the east of Lorestan province

The study of temperature fluctuations is essential for agricultural planning and environmental studies. With global warming affecting various regions, access to long-term temperature data is becoming increasingly important. Dendroclimatology is a useful tool for long-term climate study, and in this study, the average habitat temperature was reconstructed after developing the chronology of Juniperus polycarpus trees in Keygoran site (Aligodarz, Lorestan). The correlation of annual tree rings with climatic variables of meteorological stations was investigated to reconstruct the average temperature in January-March for the period 1910-2014 for this region. The findings show a positive and significant correlation between the average January-March temperature and the growth of annual tree rings. The results show the occurrence of cold years in the first years of the 1910s to the first half of the 1960s. Warm periods have occurred since the second half of the 1960s, and the temperature trend has generally been increasing in recent years. An examination of the positive and negative pointer years also shows that most of the positive pointer years occurred in the second half of the twentieth century.