Study the concomitant species of hazelnut and competitiveness of hazelnut species with their (Case Study: Ardabil Province Fandogloo forests).

ABSTRACT: This study was conducted in order to determine the concomitant species of hazelnut and competitiveness of other hazelnut species with them. To achieve this, habitat range was determined on 1:100000 map through initial circulation forest and studying forest areas. By preparing slope, direction and altitude maps and integrating them in GIS software, land unit maps were provided and finally, 4 land units in hazelnut habitat were determined to study. 16 sample plots were randomly harvested and in each sample plot quantitative parameters (number of hazelnut species group shoot per hectare, number of legs in each group shoot, diameter at breast height group shoot) were measured. The results showed that there was no significant difference between concomitant species in terms of difference the number per hectare at 5% level in Fandogloo habitat, in the geographical direction and different slope classifieds. They can also be beaten in compete with light species that have higher height.