Iran is the homeland of diverse plant and animal species.Our knowledge of the environmental factors affecting these species and their distribution will help to develop more efficient range improvement plans.Plants growing in different sites represent the climatic and topographic characteristics of their natural habitats ( Elinberg, 1992).Knowledge of these characteristics will help to develop range improvement plans based on ecological demands of different plant communities ( Escudero et.Al.,2000).For example, Allen et.al., (1995) found a significant correlation between soil and topographic properties.These results indicated that there is a possibility to estimate site potentials from both topographic features and existing plant communities.Similarly, EL‐Ghareeb and Shabana (1990) investigated correlations between soil and vegetation cover characteristics.The effective factors on establishment and growth of plant species were classified in two categories.Our studies built upon this earlier work.
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