Review on biodiversity of tree and shrub communities in desert regions (Case study: Khorasan province in Iran)

At present, although there is good information about Iran flora, but the body of information about the level of knowledge on the ecology and recognition of plant communities in dry land region is poor. Vegetation covers were identified as trees, shrubs, psamophyle and halophyte. Results showed that the grown trees in the geographic domain of desert territory of Khorasan was composed of three different communities within an area of 70,602 hectares which is about 0.6 % of the vegetation cover in the study an area of 2125480 hectares equal to 17.6% of the vegetation were covered by shrubs with seven communities (except psamophyle and halophyte species).