Structure includes vertical (number of tree layers) and horizontal features. To study of forest structure in the Northern Zagros forest, Blake forest in Baneeh region, Kurdistan province in west of Iran was selected. In Blake forest 10 square sample plots one hectare (100×100 m) were selected and in each sample plot this information include: position of tree, kind of species, diameter at breast height (cm), height (m), crown height (m) and two diameters of crown were recorded. Vertical and horizontal of this forest showed in the one sample (50×50 m, 0.25 hectare). To study of vertical structure study of distribution of tree and species in the height and diameter classes (height in three and diameter in the 5 cm classes). To analysis of horizontal structure (spatial pattern), used quadrat method, variance/mean ratio, Green and Morisata index.Data analyzing was done bySPSS16, SVS and Ecological Methodological software’s. results showed that the mean of forest characteristics including DBH, height, crown height, andcrown area, canopy density and density, 28.5 (±4.5), 6.2 (± 0.9), 4.2 (±0.58), 7.1 (±1.01), 21.3 (±2.5) and 301 (±9)were existed. Overall results showed Blake forest was two forest story and Quercus libani Oliv and Quercus infectoria Oliv were the most dominant woody plants and located in over story. DBH distribution graphs showed uneven aged stand and spatial pattern of this forest was uniform to random pattern. A traditional forest management practice in the Armardeh (Blake forest) has negative effect on the forest regeneration and increases the frequency of old trees.
