بررسی تغییر طول و عرض بذر درختان بلوط در توده‌های جنگلی دچار زوال در دو دامنه شمالی و جنوب شهرستان بانه

One of the environmental problems of the Zagros forests is the phenomenon of oak decline,. The aim of this research was to investigate the changes in the length and width of oak tree seeds in Baneh county. In order to carry out this research, two floating sites in Baneh county in the northwest of Kurdistan province. Then, in 2019, five permanent trees were determined in each decay category (healthy and with Oak declined) at each site, and 25 seeds were collected from these stands from four directions of the crown, and the length and width of the seeds were measured (also harvested in 2021). reseeding was done. One-way analysis of variance and two-way analysis of variance were used to compare the length and width of seeds in two research sites and two sampling periods, and data analysis was done using SPSS 20 software. The results showed that the highest average seed length of oak trees in 2019 and 2021 was confirmed in Oak declined trees of Beluh site, and in contrast, the lowest seed length was observed in Oak declined trees of Sarki site, and the seeds of oak trees of the southern slope (Beluh site) were larger than the seeds of trees It was Sarki's site. The results showed that there was a significant difference between the average length and width of the seeds in the 8 research treatments, and the seeds of Oak declined trees of Beluh site in 2019 and 2021 had the largest dimensions.