Soil can be considered as the eroded section of bedrock and the Earth’s surface which influences the plants and is also affected by them. As plant growth medium, soil supplies four plant basic needs including plant balance, root establishment, water and air storage and nutrients. Plant species, in turn, influence the soil properties. Understanding the relationship between plant and soil is necessary in order to increase productivity and also to reach the goals in land reclamation. To better understand the function and potential of a rangeland ecosystem, the relationship between vegetation and soil needs to be studied. The objective of this study is to understand the effect hy;s of selected rangeland plant species and parent materials on vertical distribution of major soil physical, chemical, and clay mineralogical properties in Kuhrang area. This study was carried out using a completely randomized design with factorial arrangement and three replications. Three different parent materials including marly limestone, red conglomerate and sandstone, and dolomitic limestone were selected and in each area three locations were chosen. In each parent material, 3 soil profiles under each of the plants ( Daphne sp and Astragalus .) and 3 profiles on barren soil (control) were dug and studied to the depth of 100 cm. The soils were justify; MARGIN: 0in 21.55pt 0pt 0in; mso-line-height-alt: 7.0pt" Key words : Parent material, Daphne sp , Astragalus , Soil ltr"
