Determination of diameter increment of persian oak (Quercus brantii) in West- Iran (Chaharmahal va Bakhtiari Province).

Six sample plots (each 0.5 ha) were established randomized systematicaly in oak forests of West-Iran. Five trees were selected in each sample plot from 10-50 cm diameter classes. Using increment borer, the age and diameter increment of trees were determined. More over some of qualitative characteristics were also studied. The main results can be summarized as follows: 1- 2.2% of trees showed high stem quality, 33.4% medium, 60% low quality and 4.4% defect. 2- The from factor for persian oak was calculated about f=0.2. 3- Mean annual diameter increment was determined 0.56 cm in bark and 0.53 cm without bark. 4- Total annual volume increment was calculated to 0.2 silve/ha. 5- Relationship between diameter and height was: h= 0.1799 d+ 3.1869 with R2= 0.87 6- Relationship between height and age was: h= 0.0359 a+ 5.3889 with R2= 0.69.