The investigation of habitat indicators of two species (Agropyron trichophorum link,Rieyt and Astragalus verus Olivier) according to the soil factor in Ferydan rangelands

In the same weather, existence of different soil types causes change or loss of plant community. Accordingly the full knowledge about soil condition as an important environmental factor for better understanding of plant habitat is necessary factor. In this study the relationships between two species of Agropyron trichophorum and Astragalus verus Olivier and soil in the rangelands of Karchambuy was investigated and in continue, the most important soil characteristics affecting the separation and determination of habitat was also examined. For this purpose, after visiting of the study area, nine study sites were selected based on vegetation map. Then vegetation and soil factors in these places were separately studied. For investigation of relationship between canopy cover of study species and soil factors, the researchers used multiple analyses of CCA and PCA. Results showed that soil depth, nitrogen, clay, organic matter, sand, pH and amount of lime factors were important factors affecting the establishment and growth of Agropyron trichophorum species. For Astragalus verus Olivier species amount of lime, salinity, gravel and P and saturation percentage factors are also considered as key elements in the distribution of this species. Finally, the study sites were classified into three groups. In this matter, based on Anova analysis, soil texture had a deniable role in classifying.