Check environmental factors affecting the distribution pattern of dominant species rangeland types (Case Study: Rangeland Ariz.)

In this study, the relationship between the spatial distribution patterns with environmental factors have been studied types of rangeland Ariz. After the vegetation types Astragalus.gossypinus - Centaurea.aucheri, Centaurea.aucheri- Bromus.tectorum and Festuca.ovina- Bromus.tomentellus as appearance, appropriate level of plot according to the type and distribution of vegetation types as The minimum level and the number of plots was determined by drawing. In each vegetation type, sampling was performed during 4 transects 300 m along each transect, 15 plots of 1 square meter to 20 meter intervals were established. In each plot type and number of plant species and their percentage was determined. In each vegetation type in the 12 soil profiles were taken from a depth of 40-0 cm. Physiographic features tilt, direction and height were measured, but to a height greater impact on distribution patterns of plants this parameter data was entered into the final analysis Percentage of soil texture, organic matter, phosphorus, pH, electrical conductivity, potassium and nitrogen were measured, as well as the management of rangeland condition and trends in balance method were calculated by four factors. After collecting the data, to determine the factors influencing vegetation distribution patterns of canonical correspondence analysis (CCA) using PC-ORD software was used. The results showed that among the factors studied and Spatial Pattern plants there and the most influence on the spatial distribution of vegetation types height, texture, phosphorus, potassium, nitrogen and organic matter are.