The study of structural characteristics of Zelkova carpinifolia (Pall.) trees in the Educational- Research forest of Darabkola, Mazandaran

In this study, the structural properties of Zelkova Carpinifolia trees were compared in pure and mixed stands of educational-Research forest of Darabkola. The inventory was performed selectivelyin 16 circular plots (1000 m2). In each sample plot, characteristics such as height, diameter at breast height, basal area, total volume, number of trees per hectare were recorded. Although, the study results did not show a significant difference between measured characteristics in pure and mixed stands at 95 % level but the average of total height, diameter at breast height, basal area and volume in mixed stands was more than pure stand. While the average of tree number per hectare in pure stands was greater than the mixed stands. In addition, for the studied Zelkova carpinifolia trees in the stands the same above conditions were observed. The scatter plot of diameter classes for both pure and mixed stands and also Zelkova Carpinifolia trees represented an unbalanced even aged structure. The findings of this study confirmed that Zelkova Carpinifolia trees in both pure and mixed modes had the same conditions in terms of structure