Abstract
The stabilization roles of two species, Gleditshia caspica and Parrotia persica, were studied on slopes in northern part of Iran. Landslides developed in this area because of incorrect land use and clear cutting of forest to change to agriculture land. Spread planting of Gleditshia caspica and Parrotia persica can help to control instability of soil in this area. Bishop’s method was used to calculate the safety factor of slopes. This calculation was studied for the following conditions with vegetation cover of Gleditshia caspica, with Parrotia persica and without vegetation cover. Parrotia persica helped to stabilize slopes with 45–60% grades and Gleditshia caspica helped for slopes with 25–40% grades.
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