Study of structure, composition and diversity of natural and exploited forest stands in ‎North Zagros forests

To conduct this research, 100% Inventory was performed in each stand by dividing whole study area into mosaics with dimension 40 × 40 meters. In each mosaic, all trees, shrubs and their vegetative origin were determined and also DBH, height of crown beginning, total height, height and diameter (large and small diameter) of crown were measured. To show the structure of the stands, sample plots with dimension 100 × 100 m were placed in each stand and the structural information of the forest was measured and recorded. The measured data in each stand were analyzed via statistical software and forest structure was plotted using SVS software. Comparison of the means of structural characteristics showed a significant difference at the level of 5% between the stands. The results showed that the elevation variation and stratification is greater in natural stand and the Quercus infectoria species occupies the dominant story. Also, the natural habitat has the highest crown density and developed crown and enjoys more favorable condition. Therefore, it is suggested that by modeling the natural stands and protecting and supporting the stands under traditional exploitation and implementing of enclosing and restoration operation in the exploited habitat, the condition of these stands be improved and led to a more stable situation.