Geoscience Reference
In-Depth Information
Fig. 17.4
The Caspian ecoregion has a great diversity of halophytes
halophytic flora and vegetation due to the abundance of saline habitats”. He notes
that Touranian stock in the central plateau region, particularly that of the dunes and
saline areas, has supplied numerous taxa and their derivatives, especially halophytes
and psammophytes, to the Old World northern subtropical deserts (Fig. 17.4 ).
2.3.2
Iran-O-Touranian, Mountain Zone
In mountainous sub-region the Juniperus polycar species are developed . The sub-
region has dry and cold climate, temperate summer and the annual precipitation
is about 400 mm. The plain sub- region is dominated by desert climate and hot
summer. A variety of fruit trees, medicinal, industrial, and edible plants found
in the mountain ecoregions of the Iran-O-Touranian Zone. The plant species of
these regions are: Amygdallus scoparia , Onobrychis cornuta , Acantholimon spp.,
Astragalus spp., Artemisia aucheri , Allium spp., Bromus tomentellus .
2.4
Khalidj-O-Ommanian Zone
The region with an area of 2,130,000 ha extends throughout southern parts of the
country in Khosiztan, Boushehr, Hormozgan and Sistan- Baluchistan provinces.
They are dominated by sub-equatorial climate. The main species in the region are:
Acacia - Prosopis - Ziziphus - Avicennia - Rhizophora - Populus euphratica - Prosopis
stephaniana
The indigenous plant species of the above ecological zones are classified on the
basis of average rainfall, altitude, utility and longevity in Table 17.3 .
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