بررسي تاثير چرا و عوامل توپوگرافي بر زادآوري گونه پسته در جنگل هاي خواجه كلات

Effects of grazing and topographic factors on reproduction of pistachio (Pistacia vera.L) in Khajeh forests

The pistachio tree (Pistacia vera. L) a member of the family Anacardiaceae is one of the eleven species of the genus pistacia. P. vera is the only species in this genus, successfully grown in orchards. Wild trees of this species have been growing in Khajeh forest in North East of Iran. Which produces edible nuts large enough to be commercially acceptable. The aims of this study were learn about effective factors on regeneration of this species in natural habitats in Khojeh forest. In this study we investigated the effects of deferent topographic factors such as aspect, slope, elevation and livestock grazing on reproduction of, P. vera species considering, vitality and seedling number. 48 plots in random design using of complex maps (aspect, slope, elevation) created with GIS soft ware determined and in every plot sampling of this factors were done. Results showed that slope aspect had a significant effect on seedling number (higher at north and east aspects respectively with means 129/15 & 127 seedlings per hec). But management, Elevation & slope had not significant Effects on seedling number. Results of investigations also showed that grazing and slope had a significant effect on seedling survival, but. Slope aspect and elevation had not significant Effects on seedling survival. In total the most number of seedling and their survival showed that preserving have positive effects in this region.