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Radial growth investigation of Quercus infectoria and Quercus libani Oliv in Zagros Oak Forest by using Dendrochronology
Paper ID : 1054-ADA2013
Authors:
fatemeh najafi harsini *1, kambiz pourtahmasi2, Raoufe abedini3
1College of Agriculture & Natural Resources, University of Tehran, Karaj
2Dept. of Wood and Paper Science and Technology, University of Tehran, Iran
3Depy. of Wood and Paper Science and Technology, University of Tehran
Abstract:
Many characteristics of the trees including annual ring width will be affected by climate variations. The lack of meteorological data such as temperature and rainfall during the past years and limited to a few decades, one of the problems facing us always climatology studies in Iran. The climatic data in tree rings can be evaluated through specific analysis methods. Climate change is recorded in narrow and wide rings in many trees. The science of investigation of effects of climate change on the width of the growth rings to study past climate and future climate reconstruction using tree rings is called Dendroclimatology. This research investigates the effect of temperature and precipitation on tree rings of Quercus infectoria and Quercus libani Oliv. Twenty healthy and thick trees of each species were selected from oak forests located in Iran, Zagros oak mountains. Samples were taken by increment borers. After preparing the sample surfaces, rings width were measured by binocular and LINTAB measurement table and TSAP software. Cross dating was carried out using TSAP software. ARSTAN software was used to develop the ring-width chronology. Data of temperature and precipitation were collected from the nearest Meteorological station and their effect was investigated on tree-rings.
The results showed average of rings width of Quercus infectoria was meaningfully higher than Quercus libani Oliv. Chronology of Q. infectoria was correlated with Q. libani at the 99% level of GLK. Temperature had negative effect and precipitation had positive effect on rings width in the most of months, in both of species. The effect of precipitation on tree rings of Q. libani in past November, April, May was positive and meaningful. In Q. infectoria, this effect was more important in March and May. Rings width in Q. libani was more sensitive to precipitation than Q. infectoria. The effect of temperature on tree growth in Q. libani was more important in May, June; whereas in Q. infectoria the effect of temperature was more important in June, Jan and February.
Keywords:
Dendrochronology, Quercus infectoria, Quercus libani, Temperature, Precipitation
Status : Abstract Accepted