مطالعه تاثير خصوصيات فيزيكي - شيميايي خاك در شاخص فرسايش پذيري بادي خاك وارايه مدل جهت پيشگويي آن در دشت يزد- اردكان

Wind erosion: erodibility relation to soil physical and chemical properties in Iran central plain (Yazd-Ardakan plain - case study)

Soil erosion is a serious problem throughout the world. Wind erosion is due to the increase wind velocity and air turbulent. This phenomenon usually is seen in soft, smooth, bare, dry, disperse and fine soil- It always classifies to two main factors named erodibility and erosivity. The first depends on the physical and chemical properties of soil and the second depends on wind physic and kinetic energy. The goal of the recent research is making the mathematical models which explain the relationship of soil properties with credibility. The most important factors that affect on erodibility are percent of surface gravel coverage, soil texture, gypsum, electrical conductivity and sodium absorption rate. The rest of measured factors including lime, organic matter, percent of particles greater than 0.84 mm are less important than above mentioned. Soil erodibility was measured by portable wind tunnel (wind erosion-meter ) in geomorphologic unit of Yazd - Ardakan plain. Because of the importance of desert pavement (Reg), gypsum and mean diameter of soil particle, these factors were chosen to fit for modelling. A mathematical model was made for part of catchment with erodibility range from zero to 0.50 ton! ha- hr by statistical software of Excel and Matlab. This model compared with real erodibility and erodibilit index depended on percent of soil particle> 0.84 mm. The results indicated that the model is more efficient than another one.