Investigation on Climate Variables (Temperature and Precipitation) Effects on Annual Width Rings of Pinus brutia in Lorestan Province

Trees have been affected by environmental changes, including climatic conditions. Thus, the study on anatomical and morphological characteristics of tree rings provides the possibility of climate study. The present investigation aimed to study the effect at climatic factors such as temperature (maximum, medium and minimum), precipitation on the growth rings of Pinus brutia. 30 Pinus brutia trees have been selected and were cut for this purpose. The discs were taken from each tree stump height. After sample preparation, the width of the growth rings were measured using Corel Draw graphics soft ware, with an accuracy of 0.001 mm. Mean age of trees 33 years (1977 to 2009) were recorded. A value ​​for the growth of the software ARSTAN standard and growth index was created. The correlation results indicated a positive and significant effect of climatic factors, growth index, minimum temperatures in June, the average temperature in February and maximum temperature in February and September maximum temperature on Pinus brutia rings. October precipitation has direct and significant effects on growth.