Investigation of site conditions of Astragalus eriostylus in South of Iran (case study: Bushehr province)

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Research Paper 01/04/2014
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Investigation of site conditions of Astragalus eriostylus in South of Iran (case study: Bushehr province)

Esmaeil Kouhgardi, Mehrdad Akbarzadeh
J. Bio. Env. Sci.4( 4), 32-40, April 2014.
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The main goal of this research is to study the effect of soil characteristics and land form on dispersion of Astragalus eriostylus in Southwest of Iran. 22 habitats of plant species have been identified as appropriate for study of vegetation in the view of area, density and mass dispersion and then soil sampling was done. Study of vegetation in various habitats, subject of study, has revealed that 49 plant species are grown in the region. In order to choose an optimized cluster analysis method of indicating species has been used. According to diagram of changes in number of indicating species at each stage of clustering, when four clusters are chosen, 46 species enjoys meaningful indicating value, which have been considered as optimized numbers of groups. Astragalus eriostylus species is located on positive side of the first axle and there is the highest positive correlation between the same and such elements as elevation from sea level, aspect, slope to some extent, C/N and moisture of surface soil and a negative correlation between the same and Loam in surface soil. Results show that presence of Astragalus eriostylus and accompanying species in designated ecological groups, are influenced by elevation from sea level, slope and aspect. Concerning the fact that in Bushehr Province, upon increase of elevation from sea level, temperature is decreased and annual precipitation is increased, one may say that the species, subject of study and accompanying species at higher elevations shall indicate more competition with other species and be extended more.


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