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چکیده
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[This research was conducted in range of Ravansar located in west of Iran. Relationships between soil factors and vegetation types was investigated. 4 vegetation types including Artemisia aucheri, Agropyron cristatum, Trifolium sp.Poa bulbosa, Lotus corniculatus were studied. One range land was recognized in the study area and the research was conducted within mentioned types. Canopy percentage of plant in different types was estimated based on randomized systematic sampling method, within one m2 quadrates. Along two transects 100 m each, 10 m2 quadrates established for estimating cover percentage in each type. Soil sampling was performed from 0-25 cm depths at the starting and end points of transect. Therefore sixteen profiles were dug and several chemical and physical soil properties were investigated. The soil properties evaluated were Particulate organic carbon, Particulate organic nitrogen, Total organic carbon, Total organic nitrogen, Soil texture, Lime, Available phosphorous, Acidity, Electrical conductivity, Saturation moisture content, Real density, Bulk density, Porosity and Gypsum. In order to find the relationship between soil factors and vegetation properties, multivariate techniques including detergent corresponding analysis (DCA) and principal component analysis (PCA) were used to analyses the collected data. The results showed significant relationship between some soil factors with PC1 and PC2 axes, also, among different soil factors, the distribution of range types was most strongly controlled with some soil characteristics such as Texture, Acidity, Lime, Soil moisture, and Electrical conductivity. Totally, considering the habitat conditions, ecological needs and tolerance range each plant species has a significant relation with soil proportions.]
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