studying of stabilized and non-stabilized landslide areas on the forest road cut-slope according to vegetation biodiversity (case study: chachkam district)

in this study, species richness, evenness and vegetation biodiversity were investigated in stabilized and non-stabilized cut edge areas of chachkam district forest roads in sari forest of iran. 18 micro plots 1×1m (36 micro plots) were sampled to carry out this research on two cut edge areas. number of trees, shrubs and herbaceous were recorded in each micro-plot. significant difference was investigated between the two regional diversity indices using one-way (duncan) in spss16 software. in addition, various diversity indices were calculated using of past software. the results showed that in the two cut edge areas, the number of herb species are 1185 and 366 respectively, the number of regeneration of tree species are 220 and 41 respectively and mean of richness menhinick's index for regeneration of tree species are 0.61 and 0.35 respectively, mean of richness margalef's index are 0.42 and 0.25 respectively, mean of diversity shannon's index are 0.44 and 0.19 respectively and diversity simpson's index are 0.26 and 0.12. also mean of menhinick's index herb species richness are 0.75, 0.73, richness margalef's index are 1.21 and 0.75, diversity shannon's index are 1.26 and 0.66 and simpson's diversity index are 0.63 and 0.34. the statistical test results show that diversity and richness indexes have significant difference in the two cut edge areas of forest road but the significance difference have not been observed for the index of regeneration of tree species.