Stand characteristics and distribution of a relict population of Persian ironwood ( Parrotia persica C.A. Meyer) in northern Iran

Abstract

Parrotia persica C.A. Meyer (Persian ironwood) is a deciduous tree of the family Hamamelidaceae, native to northern Iran and endemic to the Alborz Mountains. The study objectives were to assess the current status and distribution of Persian ironwood by characterizing four forest stands where the tree was either a dominant or co-dominant species. Species richness within the stands varied from 3 to 16 woody species and from 9 to 27 understory species. Basal area varied between 37 m 2/ha and 77 m 2/ha and tree density varied from 320 to 367 stems/ha. Parrotia persica represented 63–86% of the relative dominance and 41–100% of the relative density. In non-pure P. persica stands, other important tree species include Fagus orientalis and Carpinus betulus. Parrotia persica regenerates mainly by sprouts and coppicing. Conservation of relict forests, such as the Persian ironwood forests of the Alborz Mountains, is of particular concern because they represent the only natural occurrence of this species in the world. Anthropogenic disturbance, in the form of timber harvesting, livestock grazing, and clearing forest land for agriculture appear to be the largest threats to Parrotia persica's future.