نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه جنگلداری، دانشکده کشاورزی، دانشگاه لرستان، ایران
2 دانشجوی کارشناسی ارشد جنگلداری، دانشکده کشاورزی، دانشگاه لرستان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Tree increment has been under the influence of internal factors and external different factors. Throughout life, growth rates will vary depending on how the impact of these factors. Because the diameter growth, has fluctuations, at different heights in the stem. The aim of this study is to investigate the fluctuations of Pinus brutia diameter growth during the stem is done. For this purpose, the number of 31 pine trees were randomly selected and cut. Then from each tree, 5discs, from the different heights of the tree stem were taken. After preparing disks, annual rings width, using software COREL DRAW X5 and the accuracy of 0.001mm was measured. The mean diameter growth of trees in each height and stem length was analyzed using ANOVA and Duncan's. The multiple range tests showed that the amount of diameter growth of this species is meaningful at different altitude sand in the mean Duncan regimentation are not in a group. The maximum diameter and basal area increment, throughout the stem, respectively was measured by 0.7 of tree high (from the ground) and stump height. Also, based on the analysis of growth curves, absolute age for the utilization of this stand, at the age of 20, was determined.
کلیدواژهها [English]