The effects of climate variables (temperature and precipitation) on growth characteristics of trees (case study: Farim forest)

In this study, the effect of climate variables (temperature and precipitation) on diameter growth, basal area and volume of trees on the surface of Permanent sample plots in North of Iran were investigated. In this research, 313 permanent sample plots were used for correlation modeling. These sample units are located in the Jojadeh district, farim Forest. Using growth data obtained during 2003 and 2013 in this section, the growth model was obtained during a ten-year period in permanent sample plots, Also, the mean diameter, basal area and volume were used as variables related to the model. The results of this research showed that the model of growth, diameter basal area and volume with 83%, 94% and 90% correlation, respectively, have good accuracy. In addition, diameter at breast height, basal area at ​​breast height, basal area of the thickest trees, volume and climatic factors were the most important characteristics in the variation of growth in the plot area of ​​the specimen. Finally, the results showed that by using growth models, we could determine tree growth and its effective factors with proper accuracy.