اثر تناوب بهره‌برداری سقز بر زادآوری طبیعی درختان بنه (مطالعه موردی: جنگل‌های بنه استان کردستان، سنندج)

In order to evaluate the impacts of oleo-gum resin extraction periodicity on natural regeneration of wild pistachio (Pistacia atlantica subsp. kurdica), three different forest areas in Kurdistan province, west of Iran, were selected based on difference extraction periodicities (regular periodicity, irregular periodicity and without periodicity). Then homogenous unit maps in GIS produced, and one unit with identical characteristic from any three different areas were selected. Sampling in the selected units was implemented on100 pistachio tress with diameter at breast height (DBH) more than 25 cm. On each tree, DBH, number of regeneration below and outside of its crown were recorded. Results showed that the amount of regeneration among the three forest areas was significantly different (p<0.05), while this amount in areas with regular utilization periodicity was more, followed by irregular and without periodicity. Furthermore, the trees DBH in periodicity areas (both regular and irregular) was more compare to the area without periodicity (p<0.01), while the DBH in area with regular utilization periodicity was more than irregular periodicity (p<0.05). Finally, our findings suggested that galipot utilization without periodicity had a negative impact on Pistachio trees and their regeneration.