Comparison of growth characteristics of oak in pure and mixed plantations

Goal of this research was comparison of pure and mixed plantations of oak and companion species and introducing best treatment for rehabilitation of northern oak forests. This research was performed since 1994 with establishment of pure plantation of oak and mixed with maple, hornbeam, hackberry and Siberian elm in Chamestan Forest and Rangeland Research Station. The plot dimension was 25m×25m with planting distance of 1m×1m. The two lines of outer planting layers was omitted as buffer zone. Other trees were measured completely. The one way ANOVA and Tukey HSP tests were used for comparison of treatments. The study showed that better results for oak was achieved in mixed plantation with hornbeam (based on survival, diameter at breast height and H/D ratio) and Siberian elm (based on total height and pruning height), while the pure plantation and mixed with maple showed unsuitable results.