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

Document Type : Research Paper


1 MSc. Graduated of Agrometeorology, Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran

2 Prof., Dept. of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran

3 Prof., Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran

4 4Assistant Prof., Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran



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.


Main Subjects

Alipoor Fard, M., Raeini Sarjaz, M., Pourtahmasi, K., & Nadi, M. (2017). The effect of climatic variables on annual tree-rings width of Persian juniper trees in Kyguran habitat of Lorestan province. Forest and Wood Products, 70(4), 599-608. (In Persian)
Arsalani, M., Azizi, Gh., & Bräuning, A. (2014). Dendroclimatic reconstruction of May–June maximum temperatures in the central Zagros Mountains, western Iran. International Journal of Climatology, 35(3), 408-416.
Arsalani, M., Azizi, G., & Khoshakhlagh, F. (2012). Reconstruction of maximum temperature variations in Kermanshah province using tree rings. Journal of Geography and Environmental Hazards, 1(1), 97-110. (In Persian)
Arsalani M., Grießinger J., Pourtahmasi K., & Bräuning A. (2021). Multi-centennial reconstruction of drought events in South-Western Iran using tree rings of Mediterranean cypress (Cupressus sempervirens L.), Palaeogeography, Palaeoclimatology, Palaeoecology, 567.
Attarod, P., Beiranvand, S., Asgari, M., Fanaei, N., & Hashemzadeh, M. (2021). The effects of rainfall fluctuations on declining Zagros Forests in Ilam and Lorestan provinces. Iranian Journal of Forest, 13(2), 141-154. (In Persian)
Azizi, G., Arsalani, M., Arsalani, E., & Safai rad, R. (2013a). Reconstruction of Spring-Summer Maximum Temperatures Based on a Regional Chronology (1750-2010) in the Western Ridge of Central Zagros, Iran. Journal of Geography and Environmental Hazards, 1(4), 51-64. (In Persian)
Azizi, Gh., Arsalani, M., Bräuning, A., & Moghimi, E. (2013b). Precipitation variations in the central Zagros Mountains (Iran) since A.D. 1840 based on oak tree rings. Palaeogeography, Palaeoclimatology, Palaeoecology, 386, 96-103.
Cook, E.R., & Kairiukstis, L.A. (1990). Methods of Dendrochronology: Applications in the Environmental Sciences. Kluwer Academic Publishers, Dordrecht.
Cook, E.R., Anchukaitis, K.J., Buckley, B.M., D’Arrigo, R.D., Jacoby, G.C., & Wright, W.E. (2010). Asian monsoon failure and megadrought during the last millennium. Science, 328(5977), 486-489.
Fritts, H.C. (1976). Tree Rings and Climate, Academic Press, London.
Esper, J., Klippel, L., & Krusic, P.J. (2020). Eastern Mediterranean summer temperatures since 730 CE from Mt. Smolikas tree-ring densities. Climate Dynamic, 54, 1367–1382.
Gou, X., Chen, F., Jacoby, G., Cook, E., Yang, M., Peng, J., & Zhang, Y. (2007). Rapid tree growth with respect to the last 400 years in response to climate warming, northeastern Tibetan Plateau. International Journal of Climatology, 27(11), 1497-1503.
He, M., Yang, B., & Datsenko, N. (2014). A six-hundred-year annual minimum temperature history for the central Tibetan Plateau derived from tree-ring width series. Climate Dynamics, 43(3), 641-655.
Kanani, N., Fallah, A., Abedini, R., & Khorankeh, S. (2018). Effect of climatic factors, temperature and precipitation, on radial growth patterns of beech and oak in of central Alborz Mountains altitudes. Iranian Journal of Forest, 10(2), 221-235. (In Persian)
Keyimu, M., Li, Z., Liu, G., Fu, B., Fan, Z., Wang, X., Wu, X., Zhang, Y., & Halik, U. (2021). Tree-ring based minimum temperature reconstruction on the southeastern Tibetan Plateau. Quaternary Science Reviews, 251, 106712.
Köse, N., Güner, H.T., Harley, G.L., & Guiot, J. (2017). Spring temperature variability over Turkey since 1800 CE reconstructed from a broad network of tree-ring data, Climate of the Past, 13(1), 1–15.
Jones, P.D., Briffa, K.R., Barnett, T.P., & Tett, F.S.B. (1998). High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with general circulation model control run temperatures. The Holocene, 8(4), 455-471.
Jones, P.D., Briffa, K.R., Osborn, T.J., Lough, J.M., van Ommen, T.D., Vinther, B.M., Luterbacher, J., Wahl, E.R., Zwiers, F.W., Mann, M.E., Schmidt, G.A., Ammann, C.M., Buckley, B.M., Cobb, K.M., Esper, J., Goosse, H., Graham, N., Jansen, E., Kiefer, T., Kull, C., Ku ¨ttel, M., Mosley- Thompson, E., Overpeck, J.T., Riedwyl, N., Schulz, M., Tudhope, A.W., Villalba, R., Wanner, H., Wolff, E., & Xoplaki, E. (2009). High- resolution palaeoclimatology of the last millennium: a review of current status and future prospects. Holocene, 19(1), 3-49.
Liang, E., Shao, X., & Qin, N. (2008). Tree-ring based summer temperature reconstruction for the source region of the Yangtze River on the Tibetan Plateau. Global and Planetary Change, 61(3), 313-320.
Liang, E.Y., Wang, Y.F., Eckstein, D., & Luo, T.X. (2011). Little change in the fir tree-line position on the southeastern Tibetan Plateau after 200 years of warming. New Phytologist, 190(3), 760-769.
Mann, M.E. Bradley, R.S. & Hughes, M.K. (1998). Global-scale temperature patterns and climate forcing over the past six centuries, 1998. Nature, 392, 779-787.
Mann, M.E., Zhang, Z., Rutherford, S., Bradley, R.S., Hughes, M.K., Shindell, D., Ammann, C., Faluvegi, G., & Ni, F. (2009). Global signatures and dynamical origins of the Little Ice Age and Medieval Climate Anomaly. Science, 326(5957), 1256-1260.
Nadi, M., Khalili, A., Pourtahmasi, K., & Bazrafshan, J. (2013). Comparing the Various Interpolation Techniques of Climatic Data for Determining the Most Important Factors Affecting the Trees Growth in the Elevated Areas of Chaharbagh, Gorgan. Forest and Wood Products, 66(1), 83-95. (In Persian)
Nadi, M., Pourtahmasi, K., Bazrafshan, J., & Brauning, A. (2016a). Two century tree ring reconstruction of drought using Multivariate Standardized Precipitation Index (MSPI) in Javanroud-Kermanshah region. Journal of Water and Soil Conservation, 22(6), 99-116. (In Persian)
Nadi, M., Bazrafshan, J., Pourtahmasi, K., & Bräuning, A. (2016b). Two Hundred Year Based Tree-ring Reconstruction of Maximum Temperature Koliak, Nowshahr. Iranian Journal of Soil and Water Research, 46(4), 641-652. (In Persian)
Nadi, M., Pourtahmasi, K., Bazrafshan, J., & Sadeghpour, M. (2016c). Two centuries -tree ring reconstruction of temperature in the western part of the Alborz Mountains. Proceedings of the 5th Regional conference on climate change. 1-12. Tehran, Iran. (In Persian)
Nadi, M., Bazrafshan, J., Pourtahmasi, K., & Brauning, A. (2017). Tree-ring based reconstruction of the joint deficit index in Javan-Roud Region, Kermanshah (Iran). International Journal of Climatology, 37(1), 420-429.
Peng, Z., Qin, L., Li, X., Zhang, H., Chen, Y., Liu, R., & Zhang, R. (2020). Tree-ring-based temperature reconstruction since 1766 CE in the eastern Tianshan Mountains, arid Central Asia. Theoretical and Applied Climatology142, 687–699.
Pourtahmasi, K., Poursartip, L., Bräuning, A., & Parsapjouh, D. (2009). Comparison between the radial growth of juniper (Juniperus polycarpus) and Oak (Quercus macranthera) trees in two sides of the Alborz Mountains in Chaharbagh region of Gorgan. Journal of Forest and Wood Products, 62(2), 159-169. (In Persian)
Yang, B., Qin, C., Huang, K., Fan, Z., & Liu, J. (2010). Spatial and temporal patterns of variations in tree growth over the northeastern Tibetan Plateau during the period AD 1450-2001. The Holocene, 20(8), 1235–1245.
Zhang, Y.X., Shao, X.M., & Wilmking, M. (2011). Dynamic relationships between Picea crassifolia growth and climate at upper treeline in the Qilian Mts., Northeast Tibetan Plateau. China. Dendrochronologia, 29(4), 185-199.