Effect of Altitude on Annual Diameter Growth of Quercus libani Oliv in Kurdistan Province

The purpose of this study is determination of best altitude range for forestation of Quercus libani Oliv in Kurdistan province and dendrochronology of this species. For this purpose، twelve disks as a random sampling used from pulled trees on three elevation classes (1400-1600m، 1600-1800m، 1800-2000m) in Marivan forest. ANOVA results showed that diameter growth on these elevation ranges have significant difference (p<0. 05). The average annual increment diameter on first class (1400-1600m) measured about 2. 2mm، second class (1600-1800m) 2. 6mm and third class (1800-2000m) 1. 8mm. Also، results showed that second class site has a better growth condition than other sites. Thus in three sites، average of annual diameter increment in Quercus libani Oliv indicated a direct relationship with precipitation of the last 17 years.