Investigation on Spatial Distribution of Wych elm (Ulmus glabra) in Relation to Physiographic Factors in Experimental and Educational Forest of Kheyroud Kenar

The current research was carried out in Patom, Nam Khaneh, Gorazbon and Chelir Districts in Experimental and Educational Forest of Kheyroud. Thanks to extent of study area and dispersion of Wych elm on this area, the plot less sampling method was applied. After field inspection and identifying the remaining individuals of Wych elm trees (Ulmus glabra), d.b.h ≥10cm, Physiographic Factors (altitude a.s.l, aspect, slope were recorded. The results show that Wych elm trees were distributed from 330 m to 1315m above sea level. On north-facing and east-facing slopes, the numbers of elm trees were the most and least, respectively. In relation to slope or steepness, this tree dispersed on plain or flat terrain to steep slopes but the number of tree in gentle slope was more than higher slope.