Investigation the effect of climate variables on growth patterns of the cypress (Cupressus sempervirens Var. Horizontalis) trees in Noshahr and Rudbar habitats

The purpose of the present study is to investigate the effects of climate variables on the width of the growth rings of Cupressus sempervirens Var. Horizontalis In the cities of Rudbar and Noshahr in Gilan and Mazandaran provinces. For this purpose, the number 13 discs were totally prepared from the breast height of the trees in two regions and after the preparation of samples including: cutting, sanding and specifying the borders of growth rings, the surfaces of the discs were photographed. Images were imported to Digimizer software in JPG format and the width of the growth rings was measured with 0.01 mm accuracy. Then the standardization and time matching steps were performed on the images. The chronological length of 38 years (1979-2017) gained and matching of the variance (GLK) of 77.26 and 70.10%, for Rudbar and Nowshahr measured, respectively. The average growth of 2.46 mm for Rudbar tree rings and 5.20 mm for Nowshahr tree rings were obtained. The results also showed that the growth of trees in Rudbar region had a positive and high correlation with precipitation factor (r = 0.94) and a negative and moderate correlation with temperature factor (r = -0.51). However, the effect of climatic factors on the growth rings of trees in Noshahr was not significant. According to the results of this study, the lack of dry season and mild condition of the plain in Noshahr area,