A Phytosociological Study Of English Yew (Taxus Baccata L.) In Afratakhteh Reserve
2007
Esmailzadeh, O., Ph.D Candidate of Forestry, Tarbiat Modarres University, | Hosseini, S.M., Scientific Member of Tarbiat Modarres University, | Scientific Member of Tarbiat Modarres University
English yew (Taxus baccata L.) is one of the limited coniferous species in Caspian forests of Iran that is remained from tertiary third. Afratakhteh yew reserve is one of the yew sites in Caspian forests so there are dense stands of ancient yew trees (the age of some trees is greater than 1000 year) that occasionally are forming pure yew stand. For assigning of yew association, the vegetation of this site was studied from the base of Braun- Blanquet (Zigmatist) School. Based on the analysis of these vegetation data that were sampled from 27 plots with 400m2 area and by using Braun- Blanquet phytosociological table, two yew associations (Carpineto betulus- Taxetum baccatae and Carpineto orientalis - Taxetum baccatae) with third sub association and two variant were distinguished. Correlation analysis between topographical features (height from sea level, slope and aspect) and the two mentioned yew association shows, the distribution of these plant associations is mainly affected by slope factor. Determinant coefficient shows that slope feature is the ظھ76 of operative factor in the establishment of tow yew communities. In Carpineto betulus- Taxetum baccatae which is established in less than ظھ70 slopes, Carpinus betulus and Taxus baccata are the dominant trees in over story and Ilex spinigera is the frequent species in under story. But in Carpineto orientalis - Taxetum baccatae which is established in over than ظھ70 slopes, Carpinus orientalis and Taxus baccata are the dominant trees in the over story and grass species of Festuca drymeia with companying the shrub species of Juniperus communis ssp hemisphaerica are the most frequent species in the under story.
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