Assessment of biodiversity of plant ecological groups in Vezg forest of Yasouj

Protection and developing of biodiversity are the most important subjects in forest management. The aim of this study was classification of ecological groups in Vezg forest of Yasouj and evaluation of biodiversity indicators in ecological groups. For this purpose، 52 sample plots 450 m2 were measured with systematically random method for collecting of vegetation. The TWINSPAN method and Canonical Correspondence Analysis (CCA) were used for the definition of ecological species groups and determining the relationship between ecological species groups and biodiversity indices. Also، plant biodiversity were studied based on species abundance data with general biodiversity indices. Also Tukey test and Pearson correlation analysis were used for finding significant differences between the ecological groups، alsodiscriminate analysis was used for determining of significant biodiversity indices and separate of ecological groups. Results showed that، there were four ecological species groups in the study area. The First group including: Anchusa italic-Quercusbrantii، the second group: Heterantheliumpiliferum-Avenaclauda، the third group: Teucriumpolium and the fourth group: Salvia reautreana. The ecological groups were significantly different in terms of all diversity، richness and evenness indices، so that were greater in the third and fourth ecological groups that were in high elevation and north slopes. The second and third ecological groups showedthe highest and lowest beta diversity respectively. Therophytes had the highest life forms spectrum in all of ecological groups and in geographical distribution، the forth group had the highest Irano-Turanian and Cosmopolite species. Results showed that، Shanonweaner diversity and Menhenik richness indicators، were the most important effective factors in separations of ecological groups.