Biodiversity of natural regeneration and herbage plants in relation to physiographic factors in the forests of northern Iran

Biodiversity is a concept which considered in genes, species and ecosystemlevels. But this term is more known at the species level. Concerns aboutenvironmental and social issues associated with forest sustainability - suchas effects on biodiversity changes, area, vitality, health, wood and non-woodproduction of forests - have led to international agreements and programs forimproving forest management practice. Physiographic has a physical effecton the diversity of plants and their distribution. Current study is tiring thatinvestigated diversity, evenness and richness of the species and determine andphysiographic factors affect on each of these criteria in the study area.